what is a motor control centre

8/6/2019 What is a Motor Control Centre

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What is a

Motor

Control

Centre?


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A Motor Control Centre is

a grouping of various motorcontrol & distribution

devices in one commonenclosure, fed from a

common bus system


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Cutler-Hammer manufactures

2 lines of Motor Control

Centres

Freedom Series 2100

Advantage


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Incoming

Main Lugs Only

MCC fed by upstream CB or FusibleSwitch and therefore there is no means

to disconnect power at the MCC.

Screw or Crimp type, up to 1000 MCM

6 per phase, Top or bottom entry

Lugs are connected to Vertical Bus,

which has the same rating as the

Horizontal Bus (up to 1600A)


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Incoming

Cutler-Hammer Series

C Circuit Breakers F (150A & 225A) Framecomes standard with Thermal

Magnetic trips only

K (400A) & L (600A) Frame

are available with Thermal

Magnetic or optional Digitrip

RMS 310 Electronic Trip

N (800A & 1200A) & R

(1600A, 2000A & 2500A)

Frame are stnd with Digitrip

RMS 310 Electronic Trip

Main Circuit Breaker


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Incoming

Main Fusible Switch

Cutler-Hammer heavy duty Industrially rated K Switch

Available up to 1200 Amps

Molded Case Switch

Using Hi-Mag CB (MCS) to provide disconnecting means at

MCC, without short circuit protection


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Incoming

Bus Link to existingCutler-Hammer MCCs

Bus Duct Entry

Manufactured to suit

customers bus duct, based

upon customer supplied bus

duct flange drawing

Bus links & Transition cells to

connect to Cutler-Hammer,

Westinghouse, Commander &

Sylvania MCCs manufactured since1950

Transition Sections10 wide cells provide

transition to Switchgear &

Transformers


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EnclosureIndoor

-EEMAC 1

-EEMAC 1A (gasketed)

EEMAC 2 (driphood)EEMAC 12 (dust tight)

Outdoor

-EEMAC 3R (rain, sleet proof)

walk in or non-walk in


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Enclosure

Standard Section height is

90, not including 1 high

channel sill

Standard Section width is 20


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Wider Sections are available for larger

starters, Transfer Switches, PLCs, etc.

20 24 28 32 44


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Enclosure

Side View

16 deep

Section

VerticalBusLocation

Units mount

on Front Side

only

16 21

Side View

21 deep

Section

Units mount

on Front Side

Units mount

on rear on

Back to Back

MCCs

Ve

rticalBusLocation


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Cutler-Hammers standard back to

back arrangement is a total of 21deep and employs a common

Horizontal & Vertical Bus for front

& rear units.

As an alternate, we can supply 16

or 21 deep (front mounted sections)

mounted back to back, to form a 32

or 42 deep back to back design,

with 2 sets of busses. Horizontal

busses would be cross connectedwith custom buswork

Enclosure


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Enclosure9 high top and bottom wireways on Front

mounted sections

4 5/8 vertical wireway

(larger wireways available on sections over

20 wide)

15 top & 3 bottom wireway standard on

rear sections and optional on front

72 of unit mounting space available onFront and Rear of all sections

Reduced height sections

available in increments of 6


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Enclosure-ASA 61 exterior finish (ASA 49 and other

special colours available as an option)-White interior panels

-12 gauge steel sub frame

-14 gauge steel doors & covers

-lifting eyes

Optional features:

-Channel sills (adds 1 to overall height)

-Bottom plates (stnd on EEMAC 12)

-Driphood

-Space heater & thermostat

-Non conductive handrails

-Canopy lights

-Corner sections

Handrail

Driphood


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MCC Bus System

Horizontal Bus

Vertical Bus

Horizontal Ground Bus

Option Vertical Ground

Neutral Bus

Horizontal Ground Bus can be mounted at bottom

if no Neutral bus is being used


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Horizontal BusCopper or Aluminum

Tin or Silver plated-600 Amp

-800 Amp-1200 Amp

-1600 Amp

-2000 Amp

-2500 Amp

-3200 AmpCSA rated for 65 degree C rise


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Vertical Bus

Copper or Aluminum

Tin or Silver plated-400 Amp (standard on Front

mounted sections

-600 Amp (standard on Back toBack Sections, optional on front)

-800 Amp

-1200 Amp-1600 Amp

In the incoming section, the Vertical bus hasthe same rating as the Horizontal bus (up to

1600A)


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Ground BusHorizontal Ground Bus (stnd location

at top of section, also may be mountedat bottom of section)

Standard horizontal ground is 300

Amp (1/4 x 1). Optional 600 Amp(1/4 x 2) is available

Optional Vertical Ground Bus (1/4 x 1)mounted in the vertical wireway

Neutral BusOn 4 wire systems, mounted at

bottom of section, available at 300A,600A and 800A


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Bus IsolationAll MCC power busses are

isolated to prevent accidentalcontact

Horizontal bus is mountedbehind steel barriers the top

wireway

Vertical bus comes with glass

polyester barriers withremoveable stab hole covers

Glass Polyestor Barriers

with stab covers


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Bus Insulation

Horizontal bus is available withoptional Insulating boots, up to

2500 amp

An optional Labyrinth Insulating

barrier is available on the

Vertical bus. Optional automatic

shutters are available.

Bus boots on the Horizontal bus

Labyrinth barriers on Vertical bus


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MCC Bus System

Horizontal Bus

600 Amp to 3200 Amp

Vertical Bus

400 Amp to 1600 Amp

Horizontal Ground Bus

300 Amp (1/4 x 1)

or 600 Amp (1/4 x 2)

Option Vertical Ground

300 Amp (1/4 x 1)

Neutral Bus

300 Amp, 600 Amp

or 800 Amp

Horizontal Ground Bus can be mounted at bottom

if no Neutral bus is being used


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Incoming Cables

Main Circuit

Breaker Open

MCC bus not

Energized


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Main Circuit

Breaker Closed

MCC bus

Energized

Incoming Cables


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PLUG

ONTOMCC

VERTICALBUS

TOM

OTOR

M

R

OL

T

OMOTOR

STARTER

STOP

START

M

M

Main CB Closed

MCC Bus EnergizedStarter CB Open


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Main CB Closed

MCC Bus EnergizedStarter CB Closed

PLUG

ONTOMCC

VERTICALBUS

TOM

OTOR

M

R

OL

T

OMOTOR

STARTER

STOP

START

M

M

Main CB Closed


Starter coil not energized


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PLUG

ONTOMCC

VERTICALBUS

TOM

OTOR

M

OL

T

OMOTOR

STARTER

STOPSTART

M

M

Main CB Closed


Momentary Start PB depressed

Starter Coil energized

Motor Starts


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PLUG

ONTOMCC

VERTICALBUS

TOM

OTOR

M

OL

T

OMOTOR

STARTER

STOP

START

M

M

Main CB Closed


Seal in Contact closes

Momentary Start PB released

Starter Coil energized

Motor Runs


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PLUG

ONTOMCC

VERTICALBUS

TOM

OTOR

M

OL

T

OMOTOR

STARTER

STOP

START

M

M

Main CB Closed


Stop Pushbutton depressed

Starter Coil De-energiaed

Motor Stops


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Units

Common MCC Units

-Combination Motor Starters-Fusible & CB type Feeders

-Panelboards

-Distribution Transformers

-PLCs

-Metering-Hydro Metering Compartment

-Transfer Switches

-Clipper TVSS units


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Motor Starters

Motor Starter units are Combination

Starters, consisting of a Starter and a

disconnect device, either a Circuit

Breaker (HMCP or Thermal Mag)

or Fusible Switch


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Freedom Starters

Size 1 to 6 EEMAC rated,or optional IEC starters,

c/w adjustable bimetallicoverload relay

Compact 6 size 1 (IEC size F) and

18 Size 3 & 4 (CB type) are available


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Advantage Starters

Size 1 to 6 EEMAC Starter c/wElectronic Overload Relay

Various control, metering & ground

fault modules are available as well as

PONI communications modules

Compact 6 size 1-2 and 18 Size 3-4

(CB type) are available


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6 Compact Starters

-Provides space savings, 12 units

in a Front mounted Section & 23

in a Back to Back-Available with Freedom NEMA,

Freedom IEC or Advantage

-HMCP or Fusible Switch

-Up to 25 HP in some

configurations


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Optional Units

Developed based on feedbackfrom various MCC users

-Slider operator mounted on RH

side (mandatory in manyindustries for safety)

-Rugged Industrially rated K

Switch with visible contactblades

-Full accessibility to Power

Fuses


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IT Solid State Starter

Intelligent Technology (IT), theindustries most compact MCC

Solid State Starter design,

requiring 30-63% less space

Up to 900 HP at 690V

Compact, easy to program and

advanced functionality

125 HP IT Starter in

18 high MCC unit


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Vacuum Contactors

Available in 135, 270 & 540Amp ratings.

Used in conjunction with C306

Freedom Overload in MCCs

Provides long service life and

low maintenance requirements


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FeedersThermal Magnetic CB type Feeders from

HFD to RD Frame

Available in 6 compact and Dual

configurations (maximum 150A)

Fusible Feeders using K-Switch, up to 1200

Amps

Available in 6 compact (up to 60A) and

Dual (up to 100A) configurations

Dual MountedCB type

Feeder


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OEM

Basic Class 1 Type ASections & Units supplied to

OEMs c/w

-Blank panel (with or without Circuit

Breaker & operating mechanism

-Devices (PLC, VFDs, etc) mounted& wired by the OEM

-Special heights available


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Digital Metering

Cutler Hammer PowerManagement Products

-IQ Analyser-IQ DP-4000

-IQ Generator

-IQ Data-IQ 200

IQ DP-4130

Digital Meter


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Metering

Standard AnalogueMeters

Service Entrance

Sections c/w Utility

Metering

Compartments


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MCC unit features

OperatingMechanism

DevicePanel

Bus Stabs

GroundingClip

Terminal

Block

CircuitBreaker

Contactor

&Overload

PivotTube

Unit

Latch


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Operating Mechanism

Grey Toggle Slider

MCC unit features

-Indicates position of the Disconnect

Interlocked with door so that:-When ON door cannot open and

unit cannot be withdrawn

-When door is open, operator is held

in OFF

-Unit cannot be withdrawn unless inOFF position

-A Defeater mechanism is provided

for Authorized personnel

-Padlockable in OFF position


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Unit ground clip

Grounds unit to structure

prior to engaging theMCC bus

MCC unit featuresBus Stabs

-Plugs units onto theVertical bus up to 400A

-Fully shrouded, floating

stab fingers

-Tin plated (silver

optional) copper/steel

alloy stab


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MCC unit features

Unit Device PanelMounted on MCC unit

Hinges down for unit access

Holds up to six devices:

-30mm Pilot Devices(Lights, PBs Selector Switches)

-Mini Meters

(Ammeter, Voltmeters, ETM)


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MCC unit featuresUnit Latch

locks unit in position

Latches & locks in 3 positions:

-Fully engaged-Test or detent position

-Withdrawn

Door Latch

Heavy duty 1/4 turn latch

provides positive door closure

and latch position indication


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Unit Wiring


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Unit Wiring

Type A - No terminal blocks

Type B - Control TBs in Starter unitsType C - Control TBs in Starter units which are wired

to master control TBs at the top or bottom of each

MCC Section

Class I - No interwiring between units

Class II - complete control system including control

drawings showing remote devices and/or interwiringbetween units.

Unit Wiring


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Unit Wiring

ST

ARTER

Class IType A

Field

wiringdirectly

onto

Starter

ST

ARTER

Class IType B

Field

wiringonto

control

TBs,

which

are

factory

wired to

the

Starter

STARTE

R

Class I

Type C

Field

wiring

onto

master

TBs (at

top or

bottom)

whichare

wired to

TBs in

StarterUnit

Unit Wiring


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Unit Wiring

STARTER

START

ER

Class II factory

wiring

between two ormore units in

the MCC

Unit Wiring


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Unit Wiring

11A

AUTO

HAND

OFF2

3M

TRFU

X1

H1

120VX2

600V

OL

X

STOP

REMOTE

PLC

FIRE

ALARM

Class I I wiring diagram

showing remote devices


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DeviceNet MCC


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DeviceNet MCC

DeviceNet MCCs

-Reduces total installed

costs-Provides advanced

diagnostics

-Reduces or eliminates

downtime


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PANEL

MATEWPONIDNA

WPONIDNAWPONIDNA WPONIDNA

WPONIDNA

WPONIDNA

24VDC

POWERSUPPLY

MAIN

CB FEEDER

FVR

Size 1

IT

SolidState

FVNR

Size 4

FVNR

Size 2

FVNR

Size 1

SV9000

VFD

DeviceNet MCC

Conceptual View

Terminating Resistor

Trunk Cable (thick)

Tee Connector

Crop Cable (thin)


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what is a motor control centre

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