service documentation h&l milk taxi 3

of 47

Service Documentation

H&L Milk Taxi 3.0

Version 2014

of 47

Legal Notice

H&L Milk Taxi Service Documentation

This manual is published under the responsibility of the company Holm & Laue.

It applies to the following model versions:

• Milk Taxi 150 litres

• Milk Taxi 260 litres

It also applies to the following optional extras:

• Battery-powered pump and dosing/dispensing arm

• Alternative/remote control on dispensing arm

• Floor-installed heating foils

• Warm water-fired heater

• Integrated pasteuriser with cooling jacket

• EL-AN electrical locomotion drive

• Support frame for milk churn transport

• H&L cow drenching equipment

Version 3.1.4 as of April 2014

Holm & Laue reserves any and all rights of copy and reproduction. This manual may not be

reproduced, copied, disseminated, or used for competitive purposes, neither partially nor totally,

unless express and written authorisation was obtained from Holm & Laue.

of 47

Table of Contents

EXPLAINING THE SAFETY MESSAGES ............................................................................. 5

INTENDED USE.................................................................................................................... 8

UNINTENDED USE .............................................................................................................. 8

TECHNICAL SPECIFICATIONS ........................................................................................... 9

Dimensions of the Appliance................................................................................................................... 9

CHECKING THE APPLIANCE OUT PRIOR TO FIRST USE................................................10

Power Supply .................................................................................................................................... 10

Water Supply..................................................................................................................................... 10

Environment ...................................................................................................................................... 10

Milk Taxi Cleaning............................................................................................................................. 10

Battery Charging ............................................................................................................................... 10

SWITCHING THE MILK TAXI ON ........................................................................................11

Main Screen after Switching on ........................................................................................................ 11

CONTROL PANEL...............................................................................................................11

TECHNICAL DESCRIPTION................................................................................................13

General .................................................................................................................................................. 13

Exterior View, Front ............................................................................................................................... 13

Exterior View, On/Off Switch ................................................................................................................. 13

Interior View of Stainless Steel Cabinet at the Front............................................................................. 14

Interior View of Electronics Enclosure................................................................................................... 15

CPU Board ........................................................................................................................................ 15

Connection Overview of Terminal Strip ............................................................................................ 17

Phase Monitor ................................................................................................................................... 18

Heater .................................................................................................................................................... 20

Floor-mounted Agitator.......................................................................................................................... 22

EL-AN Locomotion Drive ....................................................................................................................... 23

General.............................................................................................................................................. 23

Drive Controller ................................................................................................................................. 23

Drive Axle .......................................................................................................................................... 24

Brake ................................................................................................................................................. 25

Troubleshooting Using the Flash Patterns........................................................................................ 25

Dosing Pump ......................................................................................................................................... 26

Liquid Level and Temperature Sensors ................................................................................................ 27

Pasteurisation Unit ................................................................................................................................ 28

Water Connector Panel..................................................................................................................... 28

Pasteurisation Valve Cluster ............................................................................................................. 28

of 47

Hot Water-fired Heater (optionally available if product with pasteurisation unit)................................... 29

Water Connector Panel..................................................................................................................... 29

Hot Water Valve Cluster.................................................................................................................... 30

Chargers ................................................................................................................................................ 31

Dispensing Arm and Alternative/Remote Control.................................................................................. 32

MILK TAXI SOFTWARE.......................................................................................................33

Main Menu for General Settings............................................................................................................ 33

Language .......................................................................................................................................... 33

Temperature...................................................................................................................................... 33

Light................................................................................................................................................... 33

Time Settings .................................................................................................................................... 33

Equipment ......................................................................................................................................... 34

Battery ............................................................................................................................................... 34

Emitter ............................................................................................................................................... 34

Display Screen .................................................................................................................................. 34

Defaults ............................................................................................................................................. 34

Main Menu for Maintenance.................................................................................................................. 35

Inputs................................................................................................................................................. 35

Outputs.............................................................................................................................................. 35

Heater Testing................................................................................................................................... 35

Cooling Testing ................................................................................................................................. 36

Main Menu for Pumping ........................................................................................................................ 36

Main Menu for Mixing ............................................................................................................................ 36

Main Menu for W Heater ...................................................................................................................... 37

Main Menu for Cooling .......................................................................................................................... 37

Main Menu for Pasteurisation................................................................................................................ 38

Main Menu for Timers............................................................................................................................ 38

Timer for Pasteurisation, PA64/35 .................................................................................................... 38

Timer for Heat Treatment 60/60........................................................................................................ 39

Timer for Milk Warming ..................................................................................................................... 39

Main Menu for Washing......................................................................................................................... 41

APPENDIX...........................................................................................................................42

Circuit Diagram 400 V, 16 A, 50 Hz .................................................................................................. 42

Circuit Diagram 230 V, 32 A, 50 Hz .................................................................................................. 43

Circuit Diagram of On/Off Switch ...................................................................................................... 44

Component Positions in the Electronics Enclosure .......................................................................... 45

Circuit Diagram 400 V, 16 A, 50 Hz (Terminal Strip) ........................................................................ 46

Circuit Diagram 230 V, 32 A, 50 Hz (Terminal Strip) ........................................................................ 47

of 47

Dear Valued Customer:

This service documentation holds all fundamental information needed in case of a service call or a repair with

respect to the model versions of the Holm & Laue Milk Taxi quoted on the respective page. Repairs shall be

performed exclusively by technical staff briefed on the product. This service documentation is meant to achieve a

good understanding of the basics and does not replace a training/briefing at the manufacturer’s.

Depending on the level of equipment and year of manufacture of your Milk Taxi, descriptions in this booklet may

differ from your particular product.

Explanations on how to use the Milk Taxi can be found in the H&L Milk Taxi User’s Manual.

Figures in this booklet are meant to illustrate for a good understanding and may differ from a particular product at

hand.

Please read carefully and conform to the safety messages in this booklet and the User’s Manual. The safety

messages are identified according to hazard levels as follows.

Explaining the Safety Messages

Safety messages are identified according to the following colour-coded hazard levels.

DANGER

• This identifies a highly hazardous situation. Failure to conform to the safety message will result in severe, irreversible injury or death.

WARNING

• This identifies a highly hazardous situation. Failure to conform to the safety message may result in severe, irreversible injury or death.

CAUTION

• This identifies a highly hazardous situation. Failure to conform to the safety message may result in light to moderate injury.

ATTENTION

• This identifies a hazard for hardware and materials. Failure to conform to the safety message may result in damage to assets.

of 47

General Safety Messages

The safety messages given below have to be respected at any and all times.

Additionally, never neglect respecting the individual safety messages given at the different procedures!

DANGER

Danger to life by failure to respect the User’s Manual and Service Documentation

• Ensure that the servicing staff have read and understood the User’s Manual, the

Service Documentation, and the safety messages.

• The User’s Manual and the Service Documentation have to be ready at hand

close to the Milk Taxi at all times.

DANGER

Danger to life and of casualty for children

Make sure that while service or repair work is in progress, no children are in the

immediate vicinity of the Milk Taxi. It is built with electrical and mechanical

components that may cause hazards that children are unable to properly

anticipate. They would be exposed to danger of death or severest injury.

• Children do not anticipate the hazards to which a technical appliance may

expose them! The Milk Taxi is not designed to be used by children.

• Keep the Milk Taxi out of the reach of children!

• The Milk Taxi must be operated exclusively by persons who are able to operate

it in a safe way.

DANGER

Carrying people prohibited

• It is strictly forbidden to use the Milk Taxi for the transport of persons, animals

or hazardous substances (chemicals).

• In particular, it is forbidden to use the milk churn support frame for the transport

of anything other than churns or buckets with milk or water in them.

• Subjecting the milk churn support to any load of more than 70 kg is

unacceptable and will cancel and void the warranty for the Milk Taxi as a whole.

DANGER

Hazard by electricity

• Service work on the Milk Taxi requires disconnecting it from mains power.

• Using optional features with mains connection (pump, battery, charger, agitator

motor or heater) requires the Milk Taxi to be earthed through the mains power

cord. To ensure this, the Milk Taxi has to be connected to a socket that is

properly installed pursuant to all applicable rules and is equipped with protective

contacts.

• Never open the Milk Taxi enclosures when it is connected to mains power.

of 47

WARNING

Beware of severe bruises by falling lid

• While the appliance is pushed or driven, always keep the lid closed.

• Secure the lid so it will not flap down when you are working with the lid open.

• When you close the lid make sure that no part of your body is between the lid

and the tank rim.

WARNING

Fire hazard

• The lid of the Milk Taxi may concentrate the sun’s rays, when it is open,

because of its concave shape on the inside. In this case, the focal point of the

lid may develop excessive heat.

• Keep the lid closed at all times.

• Never leave the Milk Taxi unattended when it is outdoors.

WARNING

Hazard associated with the battery leaks

• When the batteries of the Milk Taxi are damaged, they may release acids and

other substances. These substances may cause intoxication and burns.

• Avoid any mechanical strain that may damage the battery.

• Only qualified/licensed persons are allowed to replace the battery.

CAUTION

Danger by unwanted movement

• The Milk Taxis 150 litres and 260 litres have a parking brake at the right-hand

pivoting wheel. The brake ensures that the Milk Taxi will not move or roll with no

one present; it should be pulled whenever the Milk Taxi is not pushed or driven.

of 47

Intended Use

The H&L Milk Taxi is designed for preparing and dosing calves’ milk diet in commercial dairying and agriculture.

Its drenching equipment also allows drenching cows. Do not pour anything other than water, whole milk, milk

replacer or nutritional additives, such as electrolytes, into the tank.

The pasteurisation feature is designed exclusively for the treatment of calves’ milk diet and for heating water. Any

other use or purpose cancels any and all warranty under which the product is. Holm & Laue cannot be held liable

for bodily injury or material damage that is the result of improper use of the H&L Milk Taxi.

Unintended Use

Any use other than those quoted above as intended uses is considered an unintended use.

Note in particular:

• Never pasteurise beestings/colostrum! The protein structure of colostrum is different from that of normal

whole milk. The proteins beestings contain may become indigestible by the heat treatment, thereby

putting the calves’ health at risk. The loss of quality that the milk sustains can be seen from

agglutinations and burnt milk deposited in the Milk Taxi. Burnt milk, in turn, may damage the floor-

installed heating element.

• Never put food for human consumption, such as soup, coffee, tea or water, into the tank.

• Never put harmful or toxic solutions into the tank (the only exception being common cleaning agents for

milking installations)! In no circumstances put any hard or pointed objects into the tank, and don’t pour

inhomogeneous or pasty liquid into it. All of them may damage the mixing agitator, the heating foils

installed on the floor, and the pump.

Residues in the tank may contaminate the milk diet the calves are fed, thereby putting their health at risk, even

when the tank was cleaned before being used again.

• Prepare your animals’ milk diet according to the recommendations provided by the milk replacer

manufacturer.

• Avoid drinking temperatures in excess of 42°C (107°F), as they may cause scalding in the animals’

mouth.

• Avoid too low milk diet temperatures (depending on the milk replacer used and the acid content in the

milk), since they may cause undesired fermentation in the animals’ digestive system.

• Wash the feeder buckets and the Milk Taxi after every feeding. Improper cleaning may cause increased

bacteria growth, which would put the calves’ health at risk. Insufficient cleaning may also result in

deposits in the milk pump, which may damage it. Deposits on the floor of the tank may bake in and

cause failure of the heater.

• When using detergents, make sure by a rinse after washing that residues are properly sent out of the

tank, pump, and hose of the Milk Taxi.

of 47

Technical Specifications

Mains power supply (VDE-compatible version) 400 V 16 A 50 Hz 230 V 32 A 50 Hz

Heater power MTX 150 litres 5 kW MTX 260 litres 6 kW

Agitator power 250 W

Pump capacity approx. 40 l/min (10½ gpm)

Ingress protection IP 54

MTX 150, MTX 260 Tyre size(s)

Back: 265 mm (10½") Front: 400 mm (15¾")

Tyre pressure 2.5 bar

Operating voltage(s) 230 V (control voltage when plugged into mains) 12 V (main board) 24 V (EL-AN) *

Water supply nipple ½"

Min. storage temperature +3°C (38°F), when batteries are installed inside

Pasteurisation temperature +64°C (147°F)

Max. load of milk churn support frame 70 kg (154 lbs)

Pressure at water supply inlet *) min. 1 bar; max. 6 bar

Pressure at water connection outlet *) non-pressurised, max. height diff. of head 3 m (10 ft)

Dimensions of the Appliance

Model Version Operating Tank

Capacity Absolute Tank

Capacity Width (cm, ft in) Length (cm, ft in) Height (cm, ft in)

MTX 150 litres 150 l (39½ gal) 180 l (47½ gal) 75 (2' 5½") 130 (3' 9¼") 120 (3' 11¼")

MTX 260 litres 260 l (6811/16 gal) 290 l (76⅝ gal) 76 (2' 5

15/16") 135 (5' 5⅛") 135 (5' 5⅛")

*) Optional component(s)

of 47

Checking the Appliance out Prior to First Use

To ensure reliable operation, please conform to the following indications on the preparation of the milk room for it

and the Milk Taxi itself:

Power Supply

Depending on the level of equipment of your Milk Taxi, it requires mains power supply of 400 V, 16 A, 50 Hz with a CEE 5/16 6h connector or of 230 V, 32 A, 50 Hz with a CEE 3/32 connector The Milk Taxi has to be earthed through its connection to power supply. This means that the Milk Taxi has to be connected to the mains with a power socket with protective contact in compliance with all applicable rules (TN-C-S set-up). The figure two the right identifies the lines as present in a 400 V, 16 A, 50 Hz with a CEE 5/16 6h connector. Issues with the socket or the power supply installation may result in consequential damage sustained by your Milk Taxi! Keep in mind that all appliances with a CEE 5/16 6h connector are also equipped with a phase monitor on the inside.

Water Supply

Connecting the appliance to a mains hot and cold water supply is also recommended. When a water tap is

located at a height of 1.25 m (4 ft) above the floor, it is possible to push the Milk Taxi under the tap and fill it

effortlessly. To drain remaining milk and rinsing water cleanly, a drain in the floor is also recommended.

Environment

To avoid damage by frost to the Milk Taxi, the storage room and the room where the calves’ milk diet is prepared

have to be frost-proof. The minimum operating temperature of the Milk Taxi when charging the battery is 5°C

(41°F). The maximum operating temperature is +40°C (104°F). When in operation, the Milk Taxi has to stand on a

level floor or surface.

Milk Taxi Cleaning

Thoroughly rinse the Milk Taxi prior to using it for the first time, to remove any solvent or detergent residues in the

tank.

Battery Charging

The battery(ies) that power(s) the Milk Taxi was/were fully charged before shipment and checked at the manufacturer’s. During storage and transport, however, it/they may partially discharge.

First of all, connect the Milk Taxi to mains power through the supplied power cord. As soon as this connection is made, the battery(ies) charge(s) up. It is not necessary to switch the Milk Taxi on.

At first charging, charge the battery(ies) for at least 4 hours. Leaving the Milk Taxi connected to mains whenever it is not in use is recommended. This extends the life of the battery(ies), and you will have the Milk Taxi ready at hand for use whenever needed. The battery level is depicted on the display screen when the Milk Taxi is switched on (see page 12 in the User’s Manual).

If you will not use your Milk Taxi for a prolonged period of time (> 1 month), it is recommended to connect it to mains power permanently or to charge it for at least 6 hours every week.

of 47

Switching the Milk Taxi on

Switch the Milk Taxi on at the On/Off switch. The display first shows the Holm & Laue logo and, at the top of the

screen, the installed version of the software.

A few seconds later it changes and shows the main screen with the current time-of-day, current temperature in

the tank, level of the battery(ies), and the currently selected dosing quantity.

Main Screen after Switching on

The Milk Taxi main screen is set up as follows:

The display screen works even when the Milk Taxi is not connected to power (it uses the integrated battery). The

screen switches to stand-by and is no longer lit after approx. 20 minutes of inactivity. As soon as a key is pressed

later on, the display lights up again automatically.

Control Panel

The H&L Milk Taxi has an equipment cabinet in which the technical components of the appliance are located. In

its top left-hand area, a control panel is fitted. Depending on the level of equipment, some of the control keys may

be disabled. Only if the Milk Taxi is equipped with pasteurisation unit and EL-AN drive, all keys are active.

Current Temperature in the Tank

Current Time of Day

Level of the 12 V Battery for the Pump

Level of the 24 V Battery for the EL-AN Electrical Drive (In an appliance without the optional EL-AN drive, the display shows a value of 0%.)

Current Dosing Quantity Above and below the current dosing quantity, the next, higher and lower, quantities that can be selected are shown.

of 47

Wash Key

The Wash key can be used to start the wash cycle, which includes running the mixing agitator at

intervals and heating up the water. The temperature for the cycle can be set in the general

settings, to comply with the instructions given by the detergent manufacturer. Please note that

this feature does not wash the inside of the tank, only the pump, milk hose, and dispensing arm.

Home Key

The Home key is your access to the control and maintenance menu, and your way of quitting it

after it was accessed. Additionally, the key is used in the control and maintenance menu, for

instance to return to the last level.

Pump Key

The Pump key switches the pump on (continuous operation) or off. Timed pumping is enabled

by pushing the pushbutton on the handle of the appliance. As soon as the pump runs, the status

LED lights up. If dosing is started at the optional remote control on the dispensing arm, the LED

in the key also lights up briefly as the pump runs.

Heat Key (optional feature *)

Pressing the Heat key will switch on the heating foils installed below the tank floor. The milk is

then warmed to the preset temperature. The status LED in the upper left-hand corner is lit when

the heater is on. This feature can be used only when the Milk Taxi is connected to mains power.

Cool Key (optional feature *)

The Cool key starts manual, positive milk cooling. The feature is available only when an optional

pasteuriser is present. The status LED in the upper left-hand corner is lit when the cooler is on.

Locomotion Speed Selector (optional feature *)

The speed selector key is used to select one out of two speeds of the electrical drive motor. The

lower, right-hand status LED indicates that the lower gear is active, the upper, left-hand LED is

for the higher gear. By default, the lower gear is selected when the Milk Taxi is switched on. The

feature is available only when an optional EL-AN electrical locomotion drive is present.

Headlight Key

Pressing the Headlight key will switch the headlight fitted to the front of the Milk Taxi on or off.

The status LED in the upper left-hand corner is lit when the headlight is on.

Pasteurise Key (optional feature *)

Pressing the Pasteurise key will start the preset pasteurisation cycle. The status LED in the

upper left-hand corner is lit when the programme is running. This feature can be used only when

the Milk Taxi is connected to mains power.

Agitate Key

Pressing the Agitate key will start the mixing agitator installed on the tank floor. The status LED

in the upper left-hand corner is lit when the mixer is turning. This feature can be used only when

the Milk Taxi is connected to mains power.

Navigation Keys

The central OK key of the Navigation keys is used to acknowledge various features or functions

in the control and maintenance menu. The cursor/arrow keys can be used to navigate through

the menu and to select various functions.

* Optional Feature: If a certain optional feature is not installed in your particular appliance, when you press

its key, a message is displayed on the screen that tells you that this feature does not exist.

of 47

Technical Description

General

The technical components of the Milk Taxi are installed in the stainless steel cabinet at the front and below the

tank. Depending on the level of equipment and the year of manufacture, the descriptions below may not be fully

identical to your particular Milk Taxi. In any case, consult the additional information available on-line in the

Dealer’s Service Portal:

Address: http://www.holm-laue.de/serviceportal

Exterior View, Front

1) Headlight

2) Cover of Front Compartment

3) Dust Cap at the Front

Figure 1

Exterior View, On/Off Switch

1) Mounting Plug for External Appliances

2) On/Off Switch

3) Motor Overload Trip for Agitator in Tank

4) Motor Overload Trip for Milk Pump

Figure 2

Remark with respect to item 1 above

The shown mounting plug is the model

version 400 V, 16 A, 50 Hz with CEE 5/16 6h

connector.

of 47

Interior View of Stainless Steel Cabinet at the Front

1) On/Off Switch

2) Motor Overload Trip for Milk Pump

3) Motor Overload Trip for Agitator in Tank

4) Electronics Enclosure

5) Battery 12 V

6) Batteries 24 V

(2 x 12 V battery, daisy-chained)

7) Drain Tao with Rubber Sleeve

8) Return Line of Dispensing Arm (Milk Hose)

9) Milk Pump

10) Charger 12 V

11) Locomotion Drive Controller

12) Charger 24 V

Figure 3

Remark

The 24 V battery assembly (item 6), the 24 V

charger (item 12) and the drive controller

(item 11) are present only in an appliance with

EL-AN electrical drive.

The design of all batteries is identical.

By design, the installed battery(ies) is/are so-called gel accumulators with a main electrode made of lead. It being

coated in a silicone gel, the battery(ies) will never leak in normal circumstances. Because of this design, this type

of battery is comparatively insensitive to overcharging, but responds in the form of reduced capacity or even

failure if it is not charged on a regular basis. This is the reason why you can leave the Milk Taxi connected to

mains power and have peace of mind when no other device consuming electricity connected to the appliance is

switched on.

Remark: Use exclusively batteries identified as compatible by Holm & Laue. A list of compatible batteries

is available in the Service Portal (refer to page 13 above).

of 47

Interior View of Electronics Enclosure

After loosening the screws in all corners of the electronics enclosure, you have access to the switching and

electronic circuits of the Milk Taxi.

1) CPU Board LAD 2.0

2) Phase Monitor

3) Main Contactor

4) Heater Contactor

4a) Ancillary Relay of Heater

Contactor

5) Drive Speed Selector Relay

6) Board Switch-off Relay

7) Terminal Strip

8) Dosing Pump Relay

Figure 4

Remark

The phase monitor (item 2) is present

only in appliance with a 5-pin

connector (400 V, 16 A).

Both the sensor and the relay for the

agitator inside the tank are located

below the CPU board (item 1). To

facilitate access to these components,

LAD board bracket is fitted to the

board framing so it can be swivelled

out of the way.

See a detailed overview of the components in the appendix.

CPU Board

The CPU board controls all

components of the Milk Taxi.

Connectors X12 (RS232) and

X9 (programming) are unused

at delivery.

All Milk Taxis are equipped ex

works with a transmit and

receive board for a remote/

alternative control on the

dispensing arm.

The CPU board is fitted to the board bracket with four spacer pins (marked red in the drawing).

Figure 5

X11 D

ispla

y

Conn

ecto

r

X12

RS

232

SD Card

Remote Ctrl Transmit/ Re-ceive Board Battery

of 47

On the CPU board you will find 2 LEDs that provide additional status information at the moment of switching the

Milk Taxi on.

LED 1: off no power supply 12 V to LAD board

lit green power supply 12 V to LAD board, board ready for operation

LED 2: flashing green data communication between LAD board and Display o.k.

flashing red-and-green data communication between LAD board and Display interrupted

CPU Board Connection Overview

The connection overview provides a simplified abstract of what is connected to what. On principle all connections

of the sensors and actuators are either to the terminal strip or through the various relays. The detailed information

on these connections can be found in the terminal strip drawing and the functional descriptions of the respective

components.

Conn. Function or Use

X1 Hot Water Return Valve; Hot Water Supply Valve; Cold Water Supply Valve; Cold Water Return

Valve

X3 Relay Milk Pump; Ancillary Relay Heater, Relay Floor-mounted Agitator

X4 Power Supply to LAD

X5 Bleed Valve

X6 Liquid Level Sensor; Temperature Sensors

X7 Switch-off LAD; Headlight

X8 Drive Speed Selector

X9 Without function/not used at delivery

X10 Voltage Monitor 24 V

X11 Control/Display Panel Connection



X14 Switch-off Relay LAD

X15 Floor-mounted Agitator Sensor Connection

of 47

Connection Overview of Terminal Strip

All inputs and outputs are routed through the terminal strip. On principle all Milk Taxis, as far as the wiring on the

inside is concerned, are prepared for the electrical locomotion drive and, inside appliances with a pasteurisation

unit, for the optional hot water-fired heater. This facilitates an upgrade at a later point and avoids errors of wiring

at the moment the appliance is upgraded.

Figure 6

Connectors towards External Connectors towards Internal

Clixon LH Side Ancill. Relay Heater (R5) A1+

Clixon RH Side

Drive Controller J1 - 7


not used

Common Enclosure

Temperature Sensor Tank

Temp. Sensor Hot W. Heater

Temp. Sensor Hot W. Heater

Temperature Sensor Tank

Bleed Valve (+)

Cold Water Return (+)

Cold Water Supply (+)

Hot Water Supply (+)

Hot Water Return (+)



Drive Controller J1 -10


Headlight (–)

not used

Cold Water Return (–)

Cold Water Supply (–)

Hot Water Supply (–)

Hot Water Return (–)

Headlight (+)

Prepared Assembly for Connection of Pump Pushb.

Liquid Level Sensor

Bleed Valve (–)

LED (+)

Rel. Drive Speed (R3) Pin 11 * Pushbutton Steering Handle

Current Monitor (GND)

not used

not used

not used

not used Relay Drive Speed (R3) A1+

Current Monitor (+)

On/Off Switch Pin T1

Rel. Drive Speed (R3) Pin 14

Main Contactor Pin 14

Main Contactor Pin 13

not used

LED (–)

Drive Controller

* Remark

In appliances with drive impulse lever on the right-hand side (“old style” steering handle), the connection for the pushbutton with pin 26 is not needed.

of 47

The connectors of the terminal strip (TStr) are set up as follows:

TStr 1 - 14 : Individual Connectors (grey terminals)

TStr 15 - 19 : +12 V Power Supply (orange terminals)


TStr 22 - 25 : Common for 12 V and 24 V (blue terminals)

TStr 26 - 27 : + 24 V Power Supply (orange terminals)


Phase Monitor

All multiphase appliances (400 V; 16 A; 50 Hz) are equipped with a phase monitor. It ensures that possible faults

in the power supply to the Milk Taxi do not result in damage to any of its components. It is only after the phase

monitor detects that the actual power supply characteristics are within tolerances that phases L1, L2, and L3 at

energised through the main contactor.

The output relay of the phase monitor switches (yellow LED lights up) when the measured voltages of the phases

exceed the values set at the Min selector and yet do not exceed the value set at the Max control.

Figure 7

1) This relay enables the functionality and has to be set to

“W” (operation by voltage window). The LED to its right

lights up yellow when the supply voltage is within the

set thresholds.

2) This control sets the minimum of the acceptable supply

voltage window for every phase. The pre-set value is

70% of the nominal voltage. If this value goes below the

threshold the LED to its right lights up red.

3) This control sets the maximum of the acceptable supply

voltage window for every phase. The pre-set value is

130% of the nominal voltage. If this value goes above

the threshold the LED to its right lights up red.

4) This control determines the switching delay, which is

pre-set to a value of 0,1 s.

If one of the voltages measured in the phases rises above the value set by the Max selector, the pre-set switching

delay starts (red LED at Max flashing). When the delay expires (red LED at Max lit), the output relay de-energises

(yellow LED off). The output relay energises again (yellow LED lit) when the measured voltage returns to below

the maximum (red LED at Max off).

If one of the voltages measured in the phases drops below the value set by the Min selector, the pre-set switching

delay starts (red LED at Min flashing). When the delay expires (red LED at Min lit), the output relay b de energises

(yellow LED off).

of 47

The circuit diagram in Figure 8 represents the joint action of the phase monitor and the main contactor.

Figure 8

Remark: As Figure 7 shows, the phase monitor is mounted turned by 180 deg. to respond to wiring

requirements. The ancillary contacts 13 and 14 of the main contactor are used for the inhibit

input of the drive controller through the terminal strip (see Figure 6).

TStr

TStr

of 47

Heater

The heater is designed as surface foils glued below the floor of the tank. This ensures that the heat is transferred

consistently around the entire tank floor from the foils to the milk in the tank. Depending on the model version,

different heater ratings are used:

MTX 150 litres : 5 kW

MTX 260 litres : 6 kW

The heater is installed as two heating foils, each of which is equipped with a bimetal switch (Clixon). This switch

has a switching threshold of approx. 150°C (300°F) and, for safety reasons, opens the control circuit of the

ancillary relay of the heater contactor as soon as this temperature is exceeded. The Clixon switches being daisy-

chained, the heater is switched off completely when this safety cut-out is triggered.

Figure 9

Both heating foils are powered

by a 230 V supply and are rated

at approx. 2.5 kW in a

MTX 150 litres and approx.

3.0 kW in a MTX 260 litres.

The electrical resistance of each

foil, when cold, is approx. 50 Ω.

If this value is exceeded

substantially (> 80 Ω), is can be

assumed that the side/foil in

question of the heater has

failed.

Remark: In case of deposits formed on the floor of the tank (e.g., burnt milk), the increase of the thermal

resistance that this means compromises the proper transfer of heat from the floor of the tank to

the medium in it. This may cause irrevocable damage to the heater. Be sure at all times that no

deposits are present on the floor of the Milk Taxi tank.

TStr & & TStr

LH Clixon RH Clixon

of 47

The circuit diagram below (Figure 10) represents the joint action of the bimetal switch (Clixon) and the ancillary

relay (R5) as well as the switching of the heater contactor (R7).

Figure 10

To access the heating foils, the base plate under the appliance (purple in the figure below) has to be removed.

This requires loosening the screw at the front of the plate and pushing the plate so unlocking the fastening hooks

gets easier, after which the base plate can be lifted off the appliance. This gives access to the heating foils.

Figure 11

TStr

TStr

Clixon 1 (LH side)

Clixon 2 (RH side)

TStr

TStr

Fastening Hook

Screw

of 47

Floor-mounted Agitator

The mixing agitator mounted to the tank floor is a one-phase asynchronous motor with an operating capacitor.

The electrical capacity of this capacitor is 12 µF. The rated power at maximum liquid level (based on a

MTX 260 litres) when the agitator starts to turn is momentarily 2.0 kW.

1) Operating Capacitor Housing

2) Mounting Box

3) Mains Power Cord

4) Rubber Gasket

5) Motor Seat

Figure 12

The overheating trip of the floor-mounted agitator is located below

the On/Off switch (see page 13, Figure 2). The circuit diagram to the

right illustrates this functionality. If the overheating trip is triggered,

after waiting a short time for the motor to cool down it can be

reengaged by pushing the pin in.

The motor of the mixing agitator is controlled through the

semiconductor relay R2. This relay is located in the electronics

enclosure below the CPU board.

Figure 13

of 47

EL-AN Locomotion Drive

General

The MTX 150 litres and MTX 260 litres model versions of the Milk Taxi optionally can be equipped with an

electrical drive. In this case, two additional batteries ensuring the 24 V power supply, a drive controller, and a

24 V charger are installed in the stainless steel compartment at the front of the appliance (see Figure 3 on

page 14). Furthermore, the drive axle driven by the 24 V supply is installed inside the cover at the front.

The right-hand steering handle features a drive impulse switch used to control forward and reverse movement.

To switch back and forth between the slow and the fast gear the appropriate key is provided on the control panel

(see page 11, speed selector key). If the voltage of the batteries of the electrical drive drops below 22.1 V, the fast

gear is blocked and can no longer be selected. If the appliance is moving at that moment, it changes the gear to

slow speed automatically. The switching of the drive speed is controlled by the relay R3 (see page 23, Figure 16).

To be able to make use of the EL-AN electrical drive, the Milk Taxi has to be switched on at the On/Off switch

(see Figure 2). The circuits are designed in such a way that the locomotion drive is inactive whenever the Milk

Taxi is connected to mains power.

Safety Precaution: If there is an error in the power supply wiring, the EL-AN drive may be active even

when the Milk Taxi is connected to power. In this case, verify above all its power

supply connection (see page 10, at “Power Supply”).

Drive Controller

The drive controller is fitted above the 24 V

charger on the right-hand side in the stainless

steel cabinet at the front, using a support bracket.

Note that the controller must not be installed

directly onto the support bracket, but set on a

heat transfer paste. If not, there is a risk that the

lack of heat transfer away from the drive

controller results in damaging it.

The connections are located at the front of the

controller.

1) Drive Controller

2) Support Bracket

3) Charger 24 V

Figure 15

Figure 14

of 47

The diagram below shows the wiring and switching of the drive controller.

Figure 16

Remark 1: In appliances with drive impulse lever on the right-hand side, the connection for the pushbutton

with connector J1 pin 14 is not needed.

Remark 2: In 1-phase appliances, the phase monitor depicted in Figure 16 is not present.

Drive Axle

1) Axle with Gear Box

2) Brake with Lever to Release Brake

3) Drive Motor 24 V

4) Rubber Seal

Figure 17

Remark

The rubber seal is located on the left-hand side and

another one on the right-hand side.

TStr

TStr

TStr

TStr

Handle Pushbutton

LED

Status LED

Status LED

POT High

POT Tipper

POT Low

Drive Pot’mtr

5k

TStr

TStr

Drive Speed

Electrical Drive

Brake

Phase Monitor

Main Contactor

On/Off Switch

of 47

Brake

If the Milk Taxi should be moved without the help of the electrical drive, its brake has to be released first. This

requires opening the dust cap at the front in the cover of the axle and using the lever located behind it. To

disengage the brake, push this lever up. This opens the micro-switch of the brake, which in turn opens the circuit

that keeps it engaged.

Figure 18

After releasing the brake, to move the Milk Taxi without using the electrical drive, it still has to be switched off

(On/Off switch in the Off position) in order for the drive motor not to be under power through the drive controller.

Troubleshooting Using the Flash Patterns

By the status LED located on the left-hand side of the electronics enclosure and behind the display and control

panel cable, the drive controller shows defined flash patterns.

1) Status LED

2) Gland of Display and Control Panel Cable

Figure 19

These flash patterns are a source of information on the possible cause in cases of malfunction. Using this

diagnostic tool is possible only if the drive is set to the fast gear.

of 47

LED Flash Pattern L = long S = short Error Message Troubleshooting

LED off No power supply or controller defective

Check operating voltage Replace controller

LED lit Controller ready, no error 1,1 L K Reduction after overheating Wait for MTX to cool down to

operating temperature 1,2 L KK Drive impulse switch error Check impulse switch at the handle

Check contact pin at the controller 1,3 L KKK Limiter potentiometer error Check pin J1-4 1,4 L KKKK Low voltage error Check operating voltage 1,5 L KKKKK Overvoltage error Check operating voltage * 3,1 LLL K Safety cut-out at start on for more

than 10 seconds Switch MTX off and back on

3,2 LLL KK Break circuit failure Check pins J3-1, J3-2 and/or the brake cable

3,3 LLL KKK Error while charging capacitor Switch MTX off and back on and replace controller as needed

3,4 LLL KKKK Short-circuit in brake circuit Check pins J3-1, J3-2 and/or the brake cable

3,5 LLL KKKKK Safety cut-out at start on Switch MTX off and back on and replace controller as needed

* 4,1 LLLL K Current measuring error Replace controller as needed * 4,2 LLLL KK Motor voltage error Replace controller as needed *+

4,3 LLLL KKK EEPROM error Replace controller as needed

* 4,4 LLLL KKKK Power output stage error Replace controller as needed * Requires switching off and back on at the On/Off switch as an acknowledgement + Requires changing the parameters in the programming menu and switching off and back on at the On/Off

switch as an acknowledgement; possible only by manufacturer or authorised service partner.

Remark: The flash patterns always identifies the last detected error. This also applies in the possible event

that several errors occurred.

Dosing Pump

The dosing pump is a rotary pump operating with a 12 V DC power supply. It is installed in the horizontal position

below the 12 V battery. This horizontal installation is the reason no bleeding is needed, as common in other

circumstances, the pump being self-priming, as liquid flows into the body.

1) Pump Motor

2) Pump Bracket

3) Pump Casing

4) Tee

5) Ball Valve Connector

6) Milk Hose Connector

Figure 20

The pump is shown as removed from the cabinet and

seen when looking from the tank. When it is installed

inside the cabinet, the 12 V battery is located on the

pump bracket.

of 47

To avoid overload conditions, the pump is equipped with a thermal motor overload trip (9 A). This switch is

located on the right-hand side below the On/Off switch (see page 13, Figure 2).

Figure 21

When the motor overload trip actually trips, it can be reset, after a short while to allow the motor to cool down, by

pushing in the pin. The motor of the dosing pump is controlled through the cubic relay (R1). This relay is located

in the top right corner of the electronics enclosure, next to the CPU board (see page 15, Figure 4).

Liquid Level and Temperature Sensors

The two sensors are installed in the insulated state inside the Milk Taxi tank. The liquid level sensor is located

above the temperature sensor.

1) Liquid Level Sensor

2) Temperature Sensor

Figure 22

Both sensors are connected to the terminal strip (see page 17, Figure 6).

Remark: If the appliance is equipped with the optional hot water-fired heater, an identical temperature

sensor is located . .

On/Off Switch

of 47

Pasteurisation Unit

Milk Taxis shipping with a pasteurisation unit are also equipped with a dual-wall tank (cooling jacket), where the

cold water used as a coolant after pasteurisation flows between the tank walls. The integrated flow-directional

panels ensure that the entire surfaces of the jacket are in contact with the flowing water.

The outlet of the cooling jacket is open, i.e. non-pressurised. The maximum acceptable pressure which must not

be exceeded in the cooling jacket is 1 bar. When the pressure rises above this threshold, a release valve opens

and releases cold water from the jacket through the outlet at the floor of the tank.

Water Connector Panel

The water connector panel has the nozzles for the cold water in and the cold water out. The connector panel in on

the right-hand side of the Milk Taxi.

1) Cold Water Inlet

2) Cold Water Outlet

Figure 23

Pasteurisation Valve Cluster

The pasteurisation valve cluster is protected by the base panel of the appliance. Along with the valve cluster, the

relevant piping is accessible only after removing the base plate (see Figure 11).

1) Cold Water Outlet (Water Connector Panel)

2) Water Drain Valve

3) Water Drain Outlet

4) Release Valve

5) Cooling Jacket Inlet

6) Cold Water Inlet Valve

7) Cold Water Inlet (Water Connector Panel)

8) Cooling Jacket Oulet

Figure 24

At the beginning of the cooling process, the cold water inlet valve (6) opens and cold water flows from the water

connector panel through the cold water inlet (7) to the cooling jacket inlet (5).

of 47

When the water has flown through all of the cooling jacket, it leaves it through the cooling jacket outlet (8) to the

cold water outlet (1) of the water connector panel. When the cooling process ends, the cold water inlet valve (6)

closes again and the water drain valve (2) opens to drain the remaining water from the cooling jacket through the

water drain outlet (3).

The release valve (4) opens at excessive pressure, i.e. more than 1 bar, in the cooling jacket and releases the

water from the jacket through the water drain outlet (3).

All valves are controlled by the LAD CPU board through the terminal strip. See Figure 6 on page 17 to learn which

connection goes where on the terminal strip.

Hot Water-fired Heater (optionally available if product with pasteurisation unit)

Only Milk Taxis set up with a pasteurisation unit allow the optional outfit with a hot water-fired heater. Installing it

in a Milk Taxi without pasteuriser is not possible. If the option is built in, hot water is run through the dual wall

jacket of the tank to obtain the heating effect. In this case, too, the maximum acceptable pressure in the jacket is

1 bar.

Water Connector Panel

The water connector panel has all nozzles for both the cold water and the hot water supply (inlet and outlet in

both cases). The connector panel in on the right-hand side of the Milk Taxi.

1) Cold Water Inlet

2) Cold Water Outlet

3) Hot Water Inlet

4) Hot Water Outlet

5) Cold Water Outlet Valve

6) Hot Water Outlet Valve

Figure 25

Remark: Access to the valves on the inside of the

water connector panel is possible only from below the

Milk Taxi.

Exterior View

Interior View

of 47

Hot Water Valve Cluster

The hot water valve cluster is protected by the base panel of the appliance. It has the valves that are not installed

to the water connector panel. Along with the valve cluster, the relevant piping is accessible only after removing

the base plate (see Figure 11).

1) Cold Water Outlet (Water Connector Panel)

2) Cold Water Inlet (Water Connector Panel)

3) Drain Valve

4) Release Valve

5) Jacket Outlet

6) Hot Water Outlet (Water Connector Panel)

7) Hot Water Inlet (Water Connector Panel)

8) Drain Outlet

9) Hot Water Inlet Valve

10) Cold Water Inlet Valve

11) Hot Water Inlet Check Valve

12) Cold Water Inlet Check Valve

13) Jacket Inlet

Figure 26

Remark: The temperature sensor of the hot water-

fired heater is located between the hot water inlet

(7) and the water connector panel:

Hot water circuit

When the hot water-fired heater is started, the hot water inlet valve (item 9 of Figure 26) and the water outlet

valve of the water connector panel (item 6 of Figure 25) open. All other valves remain in the closed state. Hot

water then flows through the cooling jacket inlet (item 13), through all of the heating jacket, and leaves the Milk

Taxi through the cooling jacket outlet (item 5) and the cold water outlet of the water connector panel (item 4 of

Figure 25).

Remark: After the hot water-fired heating process is over, the jacket is not drained automatically of the

water in it!

Cold water circuit

At the beginning of the cooling process, the cold water inlet valve (item 10 of Figure 26) opens and cold water

flows from the water connector panel through the cold water inlet (item 1 of Figure 25) to the cooling jacket inlet

(item 13 of Figure 26). When the water has flown through all of the cooling jacket, it leaves it through the cooling

jacket outlet (item 5 of Figure 26) to the cold water outlet (item 2 of Figure 25) of the water connector panel. When

the cooling process ends, the cold water inlet valve (item 10 of Figure 26) closes again and the water drain valve

(item 3 of Figure 26) opens to drain the remaining water from the cooling jacket through the water drain outlet

(item 8 of Figure 26).

Pressure release valve

The release valve (item 4 of Figure 26) opens at excessive pressure, i.e. more than 1 bar, in the dual wall jacket

and releases the hot or cold water from the jacket through the water drain outlet (item 8 of Figure 26).

Control of the valves

All valves are controlled by the LAD CPU board through the terminal strip. See Figure 6 on page 17 to learn which

connection goes where on the terminal strip.

of 47

Chargers

In its standard version the Milk Taxi is equipped with a 12 V charger. If it is a version with an EL-AN electrical

drive, it also has a 24 V charger.

The 12 V charger is located on the left-hand side of the Milk Taxi, and the 24 V charger, on the right-hand side

(see page 14, Figure 3).

As soon as the Milk Taxi is connected to power, the batteries get charged. There is no needed to switch the Milk

Taxi on at the On/Off switch.

Both chargers are connected in parallel with the batteries and have a red status lamp at their fronts (see

Figure 28). This lamp lights up as soon as power is supplied to the charger. The green LEDs located below it

indicate the battery level while it is being charged, the levels being expressed as four % values (20, 50, 80, and

100).

Figure 27

Figure 28

of 47

Dispensing Arm and Alternative/Remote Control

The Milk Taxi allows an option of replacing the normal dispensing arm with an arm that features an alternative,

radio remote control of the dosing. This remote control can be used within a radius of approx. 10 m (33 ft), and

the up to 9 dosing levels identified by the numbers that correspond to the respective quantities can be selected in

ascending order and that quantity, dispensed into the bucket by a short press of the pump key.

1) Pump Key

2) Key to Select the Dosing Level

3) Check Valve

Figure 29

Remark: The standard Milk Taxi has

an integrated transmit and receive

board, which means that this upgrade

only requires replacing the actual

dispensing arm.

Inside the handle with the alternative control, you will find a 9 V battery bloc. To replace this battery, loosen the 4

screws (Torx 20) at the underside and remove the lid. This allows taking the battery out and installing the new

one.

Figure 30

Figure 31

After a battery replacement, the alternative control on the dispensing arm and the Milk

Taxi may have to be paired again. To do this, hold down the pump and the quantity

selection keys (see Figure 29) simultaneously for approx. 3 seconds. The display

screen of the remote control shows a bar floating around its edges. At the same time,

the Milk Taxi display screen asks to acknowledge the pairing by pressing the “Ok”

key. If you do not want to perform the pairing at that point, cancel the process by pressing the Home key.

of 47

Milk Taxi Software

The Home Key Functions Pressing the Home key on the control panel of your Milk Taxi opens the settings of the appliance. The advanced settings of your Milk Taxi described in this booklet are protected by a password, in order to avoid any unauthorised or inadvertent changes.

The password of your Milk Taxi’s service menu is 517 and it cannot be changed. This

menu and the options it has offer more advanced settings and diagnostics than the settings menu that customers can access. To enter the password, proceed as follows:

Use the cursor keys and to make the relevant number appear in the selected field. The cursor keys and can be used to move the cursor between the fields. To confirm your input when done, press the OK key. Remark: Upon quitting the service menu, the appliance keeps the entered password 5 more minutes in

system memory. Accordingly, before handing the Milk Taxi to your customer for use, switch it off and back on at the On/Off switch. Switching it off deletes the password from system memory.

Depending on the level of equipment of your Milk Taxi, the options in the settings menu differ. The cursor keys and can be used to select the relevant entry. To confirm your selection, press the OK key.

Main Menu for General Settings

The cursor keys and can be used to select the relevant entry. To confirm your selection, press the OK key. The General Settings menu option allows the following definitions:

Language

This option allows selecting the language used for appliance control and menu entries. The cursor keys and can be used to select the desired langugae. To confirm your selection, press the OK key.

Temperature

This option allows switching between the units for temperature display, °C and °F.

Light

This option allows defining the time duration that the headlight will remain on after being turned on. The value pre-set in the factory is 5 minutes. After this time without any key press on the control panel, the headlight goes off automatically to save the battery.

Time Settings

This option allows setting the date, time of day, and day of the week. The screen is called by pressing the OK key. The cursor keys and can be used to select the relevant entry or segment of an entry. To confirm your selection, press the OK key. Then you can set the appropriate value for that segment by using the cursor keys and and then confirming the new value by pressing OK.

of 47

Equipment

This option allows defining the capacity of the tank and the optional elements the Milk Taxi can be equipped with.

The cursor keys and can be used to select the relevant entry. Then press the OK key to switch the selected entry from No to Yes or vice versa. Remark 1: This menu is used, for instance, when a customer decides to have you equip his Milk Taxi with an

electrical locomotion drive at a later stage. After the upgrade, the optional extra must still be enabled in the control software of the appliance.

Remark 2: After installing a new control board in an appliance, it is mandatory to check and, if needed, to

correct the capacity of the milk tank of that appliance. Failure to do so may result in damage to the heater.

Battery

This option allows displaying the current voltage level of the 12 V battery of the Milk Taxi and of the current voltage of the 24 V battery on the second line, if the appliance is equipped with an EL-AN electrical locomotion drive. Additionally you have the possibility to “zero,” or calibrate, that measurement. This is required when the voltage level displayed for the battery on the screen is different from the value measured at the very battery. Before delivery of the Milk Taxi, this parameter is set in the factory. If a service call results in changing a control board, it is indispensable to checked and, if needed, correct/calibrate these settings. The zeroing point is expressed in digits in a range of 40, i.e., –20 through to +20. Range of calibration 12 V battery = 0.0125 V/digit 24 V battery = 0.025 V/digit

Emitter

This option allows changing the settings of the alternative, radio remote control on the dispensing arm. As a general rule, no adjustment of these parameters is needed. Channel By default, the transmission channel of the radio control is set to Channel 11; this setting

normally should not be changed. PAN Auto By default, the automatic assignment of a Permanent Account Number, or PAN, for the pairing

of a Milk Taxi and its alternative radio control is set to Yes. An identifier that is not automatically assigned, but defined and entered manually, is needed only when several radio communication instances overlap. To be able to work like this, automatic PAN assignment has to be set to No. The only situation where this may be required is when several Milk Taxis all communicating with their respective alternative radio controls using the same PAN pairing identifier are within the transmission radius and operate simultaneously.

PAN Id If automatic PAN assignment is set to No, this option is used to assign an identifier to the

pairing of the Milk Taxi and its radio remote control manually.

Display Screen

This option allows adjusting the contrast and the brightness of the display screen to the customer’s needs.

Defaults

This option allows resetting all previously customised settings to the default parameter values ex works. The option additionally protected by a confirmation requiring the OK key to be pressed in order to avoid any inadvertent change. To cancel the reset to default, press the Home key.

of 47

Main Menu for Maintenance

This menu allows viewing and actuating the various inputs and outputs of sensors and actuators. To enable comprehensive functional testing, the menu also features a heater test and a cooling test.

The cursor keys and can be used to select the relevant entry. To confirm your selection, press the OK key.

Inputs

This option allows direct access to the status of the inputs on the LAD CPU board. Liquid Level This option allows adjusting the switching threshold of the liquid level sensor. The pre-set

values ex works is 50/158. This value does not normally require any adjustment on your part.

Remark: Setting the switching threshold to > 158/158 effectively disables the level sensor

signal. The sensor being a safety cut-out, doing so may result in damage to the Milk Taxi or bodily injury of persons present in its vicinity!

ADC The chart witch the Analog/Digital Conversion values offers real-time values from the sensor

input. The table below explains which displayed value represents which input. The values in the ADC chart are no figures actually measured by the sensors.

Column A Column B Column C Column D

Line 1 Liquid Level Sen. Pump Pushbut. Sen. Temp. Sensor HWH Temp. Sen. Tank

Line 2 Milk Pump Timer Not used Battery 24 V Sensor

Line 3 Not used Not used Not used Not used

Line 4 Battery 12 V Not used Not used Not used

Outputs

This option allows direct actuation of the outputs on the LAD CPU board. If certain optional extras, e.g., the heater, are not enabled in the general settings of the service menu, it is impossible to actuate them at this menu option, i.e., the ancillary relay for the heater, in the above example. The cursor keys and can be used to select the relevant output. Then press the OK key to actuate the selected output. Remark: Actuating the outputs with this menu option is possible even without sufficient liquid level in the

tank. In this case, if they remain energised for long (> 5 seconds), this may result in damage to the Milk Taxi and, possibly, bodily injury of persons present in its vicinity!

Heater Testing

This allows functional testing of the heater. The duration of the full test is 5 minutes. While the test is in progress, you can check the various consecutive temperature readings on the display. It is indispensable to make sure that the Milk Taxi is full of water at least up to the lowest mark in the tank before the heater test starts. Failure to do so will result in irreversible damage of the heater.

After pouring water into the Milk Taxi tank up to the lowest mark, watch the displayed temperature in the tank: it should have risen by approx. 10°C (18°F) after 5 minutes. If the temperature increase is about 5°C (9°F) only, it can be assumed that only one side/foil of the heater is operating.

of 47

Cooling Testing

This allows functional testing of the cooling jacket. The option is available only if the Milk Taxi has a pasteurisation unit. The duration of the full test is 10 minutes. While the test is in progress, you can check the various consecutive temperature readings on the display.

For the test, the Milk Taxi should be about 50% full of water of 40°C (105°F). At a temperature of the water used as coolant of approx. 12°C (54°F), the temperature decrease in the tank should be about 2°C (4°F) per minute. Keep in mind that this value is only an approximation and can vary substantially depending on liquid level and temperature in the tank, cold water temperature, and environmental conditions

Main Menu for Pumping

The Pump menu allows the following definitions of settings: Calibrate Before you can work with the dosage control, you have to calibrate the amount to dispense. To

do so, first fill the Milk Taxi with milk or water and have a container of about 5 litres (1¼ gal), e.g. a bucket, ready. Make sure that this container stands approximately at the same height as the buckets into which you will dispense the diet. If it is at a different height, the calibration result may be biased.

When you press the OK key, the pump delivers liquid from the tank for a short time. Measure the volume of liquid delivered. Then use the cursor keys and to enter the volume you measured. To convert millilitres to grams, assume a density of 1 g/ml Confirm the value you just entered by pressing the OK key.

Dosing Levels This parameter allows setting the levels (or, quantities) to dispense when feeding the calves.

There are 9 levels in total that are available for assigning them a quantity. Factory-set are five among them, with quantities 1.6 l, 2.5 l, 3.5 l, 6.0 l, and 11.5 l.

Use the cursor keys and to select the level you want to assign a quantity. Then confirm by the OK key that you want to set or change it. The value will then flash, and you can change it by pressing the and cursor keys. When the desired quantity is displayed on the screen, confirm it by pressing the OK key again. This will save the new quantity that this level is assigned to system memory. To delete

a dosing level, use the cursor key to set the quantity to 0.0 l. When this is the displayed quantity and you confirm it by pressing OK, the screen will change to --,- and the corresponding level will be hidden. Dosing levels, or quantities, are sorted in ascending order automatically by the system, so the smallest quantity to dispense will always be assigned to level 1.

Main Menu for Mixing

The Mixing menu allows setting the run time for the mixing agitator and a number of parameters that have a direct impact on the mixing outcome.

Use the cursor keys and to select the entry you want to change or define. Then confirm by the OK key that you want to set or change it.

Run Time This parameter defines the time duration that the floor-mounted agitator will run when you press

the Agitate key of the control panel. The maximum run time that you can set is 10 minutes. A press of the OK key results in the parameter’s starting to flash and you can set the desired run time by pressing the and cursor keys. Press the OK key again to confirm this value, in order to save it to system memory.

of 47

Agitate Break This is the time duration during a period of keeping a set temperature or temperature ramp, e.g., while cooling, for which the agitator remains at rest before it starts again. The pre-set default is 15 minutes. Whenever heating or cooling resumes automatically during the period of keeping a temperature or temperature ramp, mixing also starts automatically.

Max. Agitate Break: This parameter defines how long the maximum time interval should be during positive

heating or positive cooling before the mixing agitator starts again when it stopped turning. The pre-set value is 30 sec. If possible, this value should be changed.

Overload Break This parameter defines the minimum time the agitator has to be at rest in every minute of

continuous operation. The pre-set break is 12 seconds. This value means that in every minute the agitator turns continuously it will stop for after a maximum of 48 seconds, to be at rest for 12 seconds. Changing this values is normally not needed.

Main Menu for W Heater (only with optional hot water-fired heater)

This menu enables setting the fundamental parameters for the hot water-fired heater.

Elec Heater from This allows setting the temperature from which the electrical heating foils below the floor of the tank rather than the hot water-fired heater should do the heating. This temperature has to be lower than the maximum temperature in the hot water circuit. For safety reasons, the temperature of the hot water circuit must not exceed 72°C (171°F).

WWH Stop This parameter is a temperature difference, viz., the difference between the hot water

temperature at the inlet and the temperature in the tank. If the detected difference between the two temperatures is smaller than this value, the hot water-fired heater is switched off and the electrical heater switches itself on.

WWH Meas Int This parameter allows defining a time after which a verification of the temperature in the tank

should be run in order to detect an increase. After the delay set here the temperature in the tank is going to be checked once again, to see if an increase of the temperature is there and the hot water-fired heater goes on being effective. If this is not the case, the hot water-fired heater is switched off and the electrical heater switches itself on.

Use the cursor keys and to select the menu parameter you want to access. Then confirm by the OK key that you want to set or change its value. The parameter then starts to flash and you can change the displayed value by pressing the and cursor keys. When the desired value is shown on the screen, press the OK key again to confirm it and save it to system memory.

Main Menu for Cooling (only with optional pasteurisation unit)

This menu enables setting the fundamental parameters for the cooling system. Cool T-out In case of an unsuccessful attempt to start cooling (no temperature decrease in the tank), the

time-out, or interval, defined here is observed before the next attempt is made to start the cooling programme. The check and attempt will be repeated three times. If after them the temperature still does not decrease in the tank, cooling is stopped. The pre-set default is 30 minutes.

Delay This parameter sets the delay after which the cooling should start, where the beginning of the

delay is the moment when the minimum fill level is reached in the tank. When this value is set to 00:00, cooling starts immediately after the fill level in the tank gets to the minimum.

Stop before Pa This is where the number of minutes before a pasteurisation cycle can be set, when the cooling

should stop. By the default 60 minutes of this parameters, cooling, then, stops one hour before a programmed pasteurisation.

Resume Cooling At this parameter the temperature difference (increase of the temperature) in the tank can be

set, the detection of which triggers the cooling system to resume cooling.

of 47

Main Menu for Pasteurisation (only with optional pasteurisation unit)

This menu enables setting the fundamental parameters for the pasteurisation cycle. Remark: Changing these parameters may adversely affect the pasteurisation outcome. Therefore, it may,

by the same token, adversely affect the calves’ health! This holds in particular for changes of

the period during which the temperature is kept and the pasteurisation temperature itself. Do not change any of these parameters if possible!

P Time This parameter sets the duration of the pasteurisation (period during which the temperature is

kept). The pre-set default is 35 minutes. P Temp This parameter sets pasteurisation temperature. This temperature is kept for the entire stage of

the pasteurisation proper in the cycle. The pre-set default is 65°C (149°F). P Time P This parameter sets the run time of the milk pump in the pasteurisation stage of the cycle

(period during which the temperature is kept). The pre-set default is 3 seconds. P Break P This parameter sets the break time of the milk pump (time when it does not run) in the

pasteurisation stage of the cycle (period during which the temperature is kept). The pre-set default is 30 minutes.

P Time C This parameter sets the run time of the milk pump in the cooling stage of the pasteurisation

cycle. Having the pump run in the cooling stage is not planned by default. That’s why the pre-set default is 0 seconds.

P Break C This parameter sets the break time of the milk pump (time when it does not run) in the cooling

stage of the pasteurisation cycle. Having the pump run in the cooling stage is not planned by default. That’s why the pre-set default is 0 minutes.

Main Menu for Timers

This menu allows defining up to 6 different heating and pasteurisation cycles (timers) and starting programmed timed cycles. The first screen is for the selection of the timed programme you want to change or start.

Note The timers for pasteurisation/heat treatment are available only when your Milk Taxi is

equipped with an optional pasteurisation unit. The overview screen shows you at a glance which timers are enabled and which start times are defined for them.

Use the cursor keys and to select the desired timer. Then press the OK key to access this entry. The currently enabled timers are identified by “ON.” If more than one timer is enabled, the enabled ones will be run by ascending order of start times. This means that the order of timers on the overview screen is not necessarily the order of running.

Timers/programmes for pasteurisation cycles are identified by the expression “PA64/35” whilst timed milk warming cycles are called “Heating.” As soon as you set a timer to “ON,” it starts the cycle it represents automatically at the programmed start time.

Timer for Pasteurisation, PA64/35 (only with optional pasteurisation unit)

After selecting the desired pasteurisation cycle, you have the possibility to edit it. You can set or edit the desired start time of the pasteurisation cycle and the temperature at which the diet should be fed after it. After you selected a parameter using the cursor keys and and confirmed that selection by pressing the OK key, the selected value flashes. To enhance your understanding of what is meant, the

point in the chart that is being edited, flashes as well.

of 47

Point A This point in the chart is the desired start of the pasteurisation cycle. To set or edit it, do as

follows: By pressing the OK key of the control panel, you access the hour portion of the time of day. The

fact that you have accessed it can be recognised by its flashing. Use the cursor keys and to set the hour of pasteurisation start. Then confirm your setting by pressing the OK key, which also moves the cursor/flashing to the minutes of the time of day. Again, use the cursor keys and to set the minute for pasteurisation start and confirm it by pressing the OK key.

Point B This point in the chart is the desired final temperature to which the milk should be cooled down

for feeding after the pasteurisation cycle. To set or edit it, do as follows: By pressing the OK key of the control panel, you access the temperature setting. The fact that

you have accessed it can be recognised by its flashing. Use the cursor keys and to set the desired final temperature. Then confirm your setting by pressing the OK key.

When you or your customer have programmed a given timer/cycle in this manner, this timer is available for use at any point later on.

Timer for Heat Treatment 60/60 (only with optional pasteurisation unit)

Heat treatment means that the milk his heated to 60°C (140°F) and that this temperature is kept for 60 minutes. It should be noted that this is no pasteurisation cycle, but a normal heat treatment. After selecting the desired heat treatment, you have the possibility to edit it.

You can set or edit the desired start time of the heat treatment and the temperature at which the diet should be fed after it. After you selected a parameter using the cursor keys and and confirmed that selection by pressing the OK key, the selected value flashes. To enhance your understanding of what is meant, the point in the chart that is being edited, flashes as well. Point A This point in the chart is the desired start of the heat treatment. To set or edit it, do as follows: By pressing the OK key of the control panel, you access the hour portion of the time of day. The

fact that you have accessed it can be recognised by its flashing. Use the cursor keys and to set the hour of heat treatment start. Then confirm your setting by pressing the OK key, which also moves the cursor/flashing to the minutes of the time of day. Again, use the cursor keys and to set the minute for heat treatment start and confirm it by pressing the OK key.


for feeding after the heat treatment. To set or edit it, do as follows: By pressing the OK key of the control panel, you access the temperature setting. The fact that


When you or your customer have programmed a given timer/cycle in this manner, this timer is available for use at any point later on.

Timer for Milk Warming

After selecting the desired timer/programme, you have the possibility to edit it. You can set or edit the desired start time of the warming and the final temperature to which the diet should be warmed. After you selected a parameter using the cursor keys and and confirmed that selection by pressing the OK key, the selected

of 47

value flashes. To enhance your understanding of what is meant, the point in the chart that is being edited, flashes as well. Point A This point in the chart is the desired start of the warming. To set or edit it, do as follows: By pressing the OK key of the control panel, you access the hour portion of the time of day. The

fact that you have accessed it can be recognised by its flashing. Use the cursor keys and to set the hour of warming start. Then confirm your setting by pressing the OK key, which also moves the cursor/flashing to the minutes of the time of day. Again, use the cursor keys and to set the minute for warming start and confirm it by pressing the OK key.


for feeding after warming it. To set or edit it, do as follows: By pressing the OK key of the control panel, you access the temperature setting. The fact that


To enable the previously selected timer/programme, select to parameter “[OFF]” on the screen and press the OK key. This switches the parameter from “[OFF]” to “[ON].” The three kinds of timers give you the opportunity to customise your very own sequence of pasteurisation and heating/warming cycles.

Example Your plan is to pasteurise the milk at 14:00 (2 p.m.) and then cool it down to 11°C (52°F), then

to feed it at 18:00 (6 p.m.) with a drinking temperature of 38°C (100°F). This will require two timers. 1

st timer Type PA65/35

Point A 14:00 (start time of pasteurisation) Point B 11°C (cooling-down to final temperature of 11°C) 2

nd timer Type Heating

Point A 16:30 (start time of warming) Point B 38°C (drinking temperature) Both timers are set to “[ON]”, which gives you two enabled timers in the timer listing.

Both timers/programmes will be actuated in the sequence of their start times.

Note With the tank is full the Milk Taxi needs approx. 1 to 1½ hrs to warm the milk

to drinking temperature. The actual duration depends, among other things, on the start temperature of the milk in the tank and the outside temperature.

of 47

Main Menu for Washing

This menu enables setting the fundamental parameters for washing the system.

Use the cursor keys and to select the menu parameter you want to access. Then confirm by the OK key that you want to set or change its value.

Duration At this setting, you define how long the washing/rinsing will remain on after the pre-set washing

temperature is reached. The pre-set default is 8 minutes. Temperature This parameter defines the temperature to which the washing/rinsing water should be heated.

For this setting, be sure to have it in line with the instructions given by the manufacturer of the used detergent. The pre-set default is 45°C (113°F).

Remark: Heating up the water can be used only when the Milk Taxi is connected to

mains power. Pump Time At this setting, you define how long the pump will run in the washing/rinsing cycle. The pre-set

default is 30 seconds. Pump Break At this setting, you define how long the pump will remain at rest between instances of running in

the washing/rinsing cycle. The pre-set default is 10 seconds. Agitate Time At this setting, you define how long the mixing agitator will run in the washing/rinsing cycle. The

pre-set default is 48 seconds. Agitate Break At this setting, you define how long the mixing agitator will remain at rest between instances of

running in the washing/rinsing cycle. The pre-set default is 12 seconds.

of 47

Appendix

Circuit Diagram 400 V, 16 A, 50 Hz

Clix

on

1

Wirin

g D

iag

ram

Low

Volta

ge 4

00 V

, 16 A

r

Clix

on

2

TS

tr 2

TS

tr 1

Lin

e

Filt

er

Re

ma

rk o

n o

pti

on

al c

om

po

nen

ts

A 2

4 V

ch

arg

er

is p

resen

t o

nly

if

the

app

lian

ce h

as t

he

op

tio

na

l E

L-A

N e

lectr

ica

l d

rive

.

Th

e s

ilico

ne

he

atin

g fo

ils a

re p

rese

nt

on

ly if

the

ap

plia

nce

ha

s t

he

op

tio

na

l h

ea

ter.

The

rate

d p

ow

er

of th

e h

ea

tin

g f

oils

is a

s f

ollo

ws:

- a

pp

rox.

5 k

W f

or

the

MT

X 1

50 litre

s m

od

el ve

rsio

n

- a

pp

rox.

6 k

W f

or

the

MT

X 2

60 litre

s m

od

el ve

rsio

n

of 47

Circuit Diagram 230 V, 32 A, 50 Hz

Clix

on

1

Wirin

g D

iag

ram

Low

Volta

ge 4

00 V

, 16 A

r

Clix

on

2

TS

tr 2

TS

tr 1

Lin

e

Filt

er

Re

ma

rk o

n o

pti

on

al c

om

po

nen

ts

A 2

4 V

ch

arg

er

is p

resen

t o

nly

if

the

app

lian

ce h

as t

he

op

tio

na

l E

L-A

N e

lectr

ica

l d

rive

.

Th

e s

ilico

ne

he

atin

g fo

ils a

re p

rese

nt

on

ly if

the

ap

plia

nce

ha

s t

he

op

tio

na

l h

ea

ter.

The

rate

d p

ow

er

of th

e h

ea

tin

g f

oils

is a

s f

ollo

ws:

- a

pp

rox.

5 k

W f

or

the

MT

X 1

50 litre

s m

od

el ve

rsio

n

- a

pp

rox.

6 k

W f

or

the

MT

X 2

60 litre

s m

od

el ve

rsio

n

of 47

Circuit Diagram of On/Off Switch

On/O

ff S

witch W

irin

g,

all

ve

rsio

ns

On/O

ff S

witch

TS

tr

Rem

ark

All

lines w

itho

ut

explic

it id

entification a

re H

05V

-K0

.75

mm

².

of 47

Component Positions in the Electronics Enclosure

Com

po

nen

t P

ositio

ns in

the E

lectr

onic

s E

nclo

su

re

Board

Sw

itch-o

ff R

ela

y (

R4)

Term

inal S

trip

(T

Str

)

not

to s

cale

Speed S

ele

cto

r R

ela

y (

R3) H

eate

r C

onta

cto

r (R

7)

Ancill

ary

Rela

y o

f H

eate

r (R

5)

Main

Conta

cto

r (R

6)

Phase M

onitor

(PhM

)

Flo

or-

mounte

d A

gitato

r R

ela

y (

R2)

Sensor

Sta

tus L

ED

of

Drive

Contr

olle

r

Milk

Pum

p R

ela

y (

R1)

LA

D 2

.0 B

oard

in

sta

lled

on

bo

ard

bra

cke

t

ab

ove

de

pic

ted

co

mp

on

ents

of 47

Circuit Diagram 400 V, 16 A, 50 Hz (Terminal Strip)

Wirin

g D

iag

ram

Low

Volta

ge

Mo

tor

Ove

rlo

ad T

rip

M

oto

r O

ve

rlo

ad T

rip

Mo

un

tin

g P

ow

er

Plu

g f

/ E

xte

rna

l

Mo

un

tin

g P

ow

er

Plu

g f

/ E

xte

rna

l

Mo

un

tin

g P

ow

er

Plu

g f

/ E

xte

rna

l

Lin

e F

ilte

r

Lin

e F

ilte

r

of 47

Circuit Diagram 230 V, 32 A, 50 Hz (Terminal Strip)

Wirin

g P

rincip

le f

/ Low

Volta

ge 2

30 V

, 32 A

, V

DE

Mo

tor

Ove

rlo

ad T

rip

of

Flo

or-

mo

un

ted

Ag

ita

tor

Mo

un

tin

g P

ow

er

Plu

g f

/ E

xte

rna

l

Lin

e F

ilte

r

Mo

tor

Ove

rlo

ad T

rip

of

Flo

or-

mo

un

ted

Ag

ita

tor

Lin

e F

ilte

r

service documentation h&l milk taxi 3

Documents