GVD201Vehicle Detector Operation ManualGVD201Vehicle Detector Operation Manual

GVD201 is a singl channel microprocessor based detector designed specifically for parking and vehicle access control application.

GVD201 has been designed using the most up-to-date technology in order to meet the requirements of vehicle detection.

Vehicle Detection of basic principleVehicle Detection of basic principle

When the vehicle traveling on the road through the loop,the loop inductance will be changed,GVD201 detecting the vehicle by the changes of detection loop inductance.

FeaturesFeatures

The Detector have the self-diagnosis function and automatic tunning function.the detector provides LED visuel output for power.detecting and fault.Red LED light ,indicates power is on,Green LED light indicates one vehicle is crodding the loop, or the detecting loop is in fault.

There are two output modes : Relay NO/NC,and relay pulse.

TECHNICAL DATATECHNICAL DATAElectric DataElectric Data

Power Requirements 220V AC 15%(48to60Hz)

Functional DataFunctional Data

Tuning Fully automatic

Self-timing range 20uH to 1500uH

Frequency Two step switch selectable Frequency dependent on loop size

Sensitivity Eight step switch selectable

Automatic sensitivity boot Switch selectable

Presence Relay

The working frequency setting,sensitivity setting and mode setting can be finished by the switches on dector board.

Presence time Switch selectable: Limited presence Permanent presence

Response time 200ms

Visual indication power : LED-Red LED-Green

Detects Outputs relays rated 5A/AC 230V pulse rated5A/AC230V

Reset Push button on PCB

Environmental compensation Automation driftic drife compensation

Surg protection Loop isolation transformer,gas discharge tubes, and zener diode clamping on loop input

Enviromental DataEnviromental Data

Storage Temperature 40 to+85

Operating Temperature +70

Humidity Up to 95% relative humidity without condensation

40 to

Pulse entry 100ms

Pulse exit 300ms

Fault Relay Presence relay

Functional mode conversion Switch 5 : ON Output mode1(Prsece relay output andFauls relay output) OFF Output mode2(Presence relay output and Pulse relay output)

Pulse relay Switch 7 : ON pulse exit OFF pulse entry

Pulse time Pulse time

MECHANICAL DATAMECHANICAL DATA

ABS blend,Shelf or Din rail mounting 11-pin Submagnal

78mm(H) 45mm(w) 78mm(D)

45.0

2

OPERATING PROCEDURESOPERATING PROCEDURES

Hardware set-upHardware set-up

The GVD 201 single channel vehicledetector is desingned to be shelf or DIN rail mounted,with thecomtrols ang visual indicators at the front,and wiring at the rear of the enclosure.

The power,loop and relay outputs are all connected to single 11-pin plug which is mounted at the rear of the enclosure.

Switch Setting SelectionsSwitch Setting Selections

Reset SwitchReset Switch

The detector automatically tunes to the inductive loop connected to it when the power is applied,whether on initial installation or after any break in power supply .shouly it be necessary to retune the detector,as may be required after changing any of the switches or after moving the detector from one installation to another,momentary operation of the RESET switch will inite the automatic tuning cycle.

Frequency SwitchFrequency SwitchThe frequency switches are the lower one switch,numbered 1.there are two frequency selections and are set out as follows:(OFF,ON)

Sw1 FrequencySw1 Frequency

Off High

On low

The frequency switch allow the operating frequency of the loop to be shifted higher or lower depending on the switch position .the frequency of the loop is determinde by ensuring that the loops of the two detectors are spaced sufficiently apart(approximately 2 metres beteen adiacent edges)andalso ensuring that the detectors are set to different frequencies.As a general rule the detector connected to the inductive loop with the greatest inductance should be set to operate at the lowest frequency.Loop Inductance increases as loop size,number of turns in the loop and feeder length increases.

The frequency of the switch simply canses a frequency shift on the loop.

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POWER

DETEC

PRES B

PRES A

ASB

OUTPUT

SENS

FREQ

Reset

Mode

In permanent presence mode the detector will comtinuoudly compensate for all environmental changes whilst there is a vehicle present over the loop,The relay mode is set with switch No7 and configured as follows:

SW7 (OFF,ON)

Off Limited presence

On Permanent presence

Pulse Relay/Faulse RelayPulse Relay/Faulse RelayThis is selected with switch No.7

SW5: ON Output1 warningoutput OFF Output2 Sw8 ON Pulse on detect OFF Pulse on undetect

SensitivitySensitivity

The sensitivity of the detector allows the detector to be selective as to the change of inductance necessary to produce adetect.There eightsensitivity selection and are set as follows:

SW2 SW3 Sw4

Off Off Off Hight

Off Off On

Off On Off

Off On Off

On Off Off

On Off On

On On Off Low

On On On

Sensitivity

Automatic Sensitivity BoostAutomatic Sensitivity Boost

Automatic sensitivity boost is a mode which alters the undetect level of the detector.This mode is selected by switch no.6 on the front of the enclosure and is as fllows:

SW 6(OFF.ON)

Off Disabled

On Enabled

Automatic sensitivity boost causes the sensitivity level to be boosted to a maximum detection of a vechicle,irrespective of current sensitivity level and maintainde at this level during the entire presence of the vehicle over the loop.When the vehicle leaves the loop and the detection is lost,the senditivity level reverts to the pre-selected level.

Presense RelayPresense Relay

This mode is selected by switch no.5 on the front of the enclosure and is as fllows:

SW5 (OFF,ON)On Output1 (Off Output2 ( )

Prsece relay output and Fauls relay output)Prsece relay output and Pauls relay output

Functional mode conversionFunctional mode conversion

Front Panel IndicatorFront Panel Indicator

4

Detector TuningDetector Tuning

Tuning of the detector is fully automatic.When power is applied to detector upon installation of the systen,or when a reset is initiated,the detector will automatically tune itself to the loop to whichit is connected.The detector will tune to any loop with an inductance in the range 20to1000 mixrohenries(uH).

This wide range ensures that all loop sizes and feeder combinations will be accommdates in the tuning range of the detector.

Once tuned,any slow environmental change in loop inductance is fed to a compensatingcircuit withinthe detector,which keeos the detector correctly tuned.

Detector SensitivityDetector Sensitivity

Sensitivity of the detection systems dependent on factors such as loop size,number of turns in the loop,feeder length and the presence of metal reinforcing beneath theloop.

The nature of the application determines the required sensitivity,which may be adjusted by means of the sensitivity switches on the front of the enclosure.

Sensitivity levels of the GVD201have been carefully optimised for parking and vehicle access control applications.the detection of small unwanted objects such as bicycles and trolleys can be eliminated by selecting lower sensitivity levele whilst high-bed vehicles and vehicle/trailer combinations will not loose detection by using ASB opetion.

ASB operates as follows:When ASB is dissbled,theundetect level is dependent on the sensitivity setting of the detector.Hence as the detector is made less sensitive,the undetect level will reduce accordingly.When the ASB is enabled,the undetect level will always be the same irrespective of the sensitivity setting ang will be equivalent to the undetece level when the sensitivity is on maximun setting.

Output ModeOutput Mode

In the output mode the dector will give a continuous output during the presence of a vehicle over

5

When the detector work, the channel LED will be indicate detector mode status.

1.When the detector is powered or reset,LED(Green)will flash,This is used to indicate the sensitivity grade.The number of flashing eauirelent to sensitiviy grade.After aboat asecond,LED(Green) will flash again,indicating detector work frequency (flash times 10kHz).Then LED (Green) will wink and detector go into the detect status,if the detector is in normal.

2.All output LED will light, when the detector working in the presence or pulse mode.After, the system finish tunning,output LED will wink.If the loop is in faule. LED will flash fo warning.r

Mode Indicator Light(LED) Work Status

GVD201

Flashing with high frequency The loop is in short-circuit

Lighting coutinuousby Work frequency is below 10K Hz

Or the loop is in open-circuit status

Flashing no-regula Work frequency exceed 130K Hz

When the detector automaticly restorate from the fault ststus,the detector will work continusby,butLED(Green) willkeep flashing.Indicates the fault occured ever. The infor mation can be cancelled,after,the detector is repowered or is reset.When a vehicle cross induction loop ,the channle LED(Green)will be light.The power LED in the front panel will be lighting during the detector is in working time.

Optimum functioning of the detector module is largely dependent on factors associated with the inductive sensor loop connected to it. These factors include choice of material,loop configuration and correct installation practice. A successful inductive loop vehicledetection system can be achieved bearing the following constraints in mind,and strictly following the installation instructions. The detector must be installed in a convenientweatherpoof location as close as possible to the loop.

OPERATIONAL CONSTRAINTSOPERATIONAL CONSTRAINTS

CrosstalkCrosstalkWhen two loop coop configurations are in close proximity, the magnetic fields of one overlap anddisturb the field of the other. This phenomenon, known as crosstalk, can cause false detects and detector lock up.

Crosstalk between adjacent loops operating from different detector modules can be eliminated by:

1. Careful choice of operating frequency. The closer together the two loops, the further apart the frequencies of operation must be.

2. Separation between adjacent loops. Where possible a minimum spacing of 2 metres between loops should be adhered to.

3.Careful screening of feeder cables if they are routed together with other electric cables. The screen must be earthed at the detectior end only.

ReinforcingReinforcing

The existence of reinforced steel below the road surface has effect of reducing the inductance,and therefore the sensitivity of the loop detection system. Hence,where reinforcing exists 2 turns should be added to the normal loop, as referred to in section.

The spacing between the loop and steel reinforcing shoud be greater than 150 mm although this is not always practically possible.The slot depth should be kept as shallow as possible, taking care that the feeder remains exposed after the sealing compound has been applied.

Loop And Feeder SpecifcationLoop And Feeder Specifcation

The loop and feeder should preferably constitute a single un-joined length of insulated multi-strand copper conductor, with a minimum of 1.5mm cross sectional area.

Joints in the loop or feeder are not recommended. Where this is not possible,joints are to be solderedand terminatedin a waterproof junction box.this is extremely important for reliable detector performance.

Sensing Loop GeometrySensing Loop Geometry

Sensing loops should, unless site conditions prohibit,be rectangulsr in shape and should normally beinstalled with the longestsides at right angle to the direction of traffic movement. These sides should ideally be 1 metre apart.

The length of the loop will be determined by the width of the roadway to be monitored.The loop should reach to within 300mm of each edge of the roadway.

the inductive loop.As the detector is designed with the permanent permanent presence feature,the detector will indicate vehicle presence for an unlimited period of time.If the permanent presence isnot selected,then the detece time will be dependeng on the change of inductance.The presence timeon the limited presence setting will be approximately 30minutes..

INSTALLATION GUIDE INSTALLATION GUIDE

6

A continuous loop and feeder is obtained by leaving a tail long enough to reach the detector before inserting the cable into the loop slot .Once the requird number of turns of wire is would into the slot around the loop circumference, the wire is routed again via the feeder slot to the roadway edge. A similar length is allowed to reach the detector and these two free ends are twisted together to ensure they remain in close proximity to one another.(Minimum 20 turns per metre)Maximum recommended feeder length is 100 metres. It should be noted that the loop sensitivity decreases as the feeder length increases, so ideally the feeder cable should be kept as possible.

The loops are sealed using a "quick-set" black epoxy compound or hot bitumen masticto blend with the roadway surface

300mm 300mm

SAW CUTS

1m

URB/ROADEDGE

MIN DISTANCE APART 2m(Road Width=2m) 3m(Road Width=4m)MAX DISANCE APART No Limit

45 CROSSCUT TO PROVIDE STRESS RELIEF

TRAFFIC DIRECTION

Adjacent loops connected to different detector modulesAdjacent loops connected to different detector modules

In general, loops having a circumference measurement in excess of 10 metres should be installed using two turns of wire, while loops of less than 10 metres in circumfe-rence, should have three turns or more.Loops having a circumference measurement of less than 6 metres should have four turns. it is good practice at time of installation to construct loops with alternate three and four turn windings.

All permanent loop installations should be inthe roadway by cutting slots with a masonry-cutting disc or similar device. A 45 crosscut should be made across the loop corners to reduce the chance of damage that can be caused to the loop at right angle corners.

NOMINAL SLOT WIDTH: 4 mmNOMINAL SLOT DEPTH: 30 mm to 50 mm

A slot must also be cut from the loop circumference at one corner of the loop, leading to the road way edge to accommodate the feeder.

Loop InstallationLoop Installation

7

2m Depending on Road Wid

3 Turns of Loop Cable

4mm

Slot DetailsSlot Details

CONNECTION MODECONNECTION MODE

11-pin connector wiring for GVD201 DETECTOR11-pin connector wiring for GVD201 DETECTOR

11 PIN Connector Pin No. FUNTION

1 Firewire input 220VAC2 Zero line (50-60Hz)3 Pulse Relay N/O4 Common 5 Presence Relay N/O6 Common7 8 9 power earth 10 Presence Relay N/C11 Pulse Relay N/C

Pulse Relay

Presence Relay Loop

Loop Twist this pair

8

ROAD SURFACEROAD SURFACE

30

-50

mm

Loop Sealant

3Turn of Loop Cable