667_he_20665_000

ssss ABOVE GROUND DETECTORS HANDBOOK 5

667/HE/20665/000 Issue 4 Page 1 of 31

Siemens Traffic Controls LimitedSopers LanePooleDorsetBH17 7ER

INSTALLATION AND COMMISSIONING

HANDBOOK NO 5

ABOVE GROUND DETECTORS

THIS DOCUMENT IS ELECTRONICALLY HELD AND APPROVED

PREPARED : A. Coatsworth

FUNCTION : Technical Specialist

DATE : July 2000

Siemens plc 2000. All rights reserved.

The information contained herein is the property of Siemens plc and is supplied without liabilityfor errors or omissions. No part may be reproduced or used except as authorised by contract orother written permission. The copyright and the foregoing restriction on reproduction and useextend to all media in which the information may be embodied.


667/HE/20665/000 Issue 4 Page 2 of 31Use, duplication or disclosure of data contained on this sheet is subject to the restrictions on the title page of this document.

TABLE OF CONTENTS

1. INTRODUCTION .......................................................................................................41.1 Purpose......................................................................................................................................................... 41.2 Scope............................................................................................................................................................. 41.3 Related Documents...................................................................................................................................... 41.4 Glossary........................................................................................................................................................ 4

2. AVAILABILITY OF ABOVE GROUND DETECTORS...............................................52.1 General ......................................................................................................................................................... 52.2 Detectors to DETR Specification TR2123................................................................................................. 52.3 Detectors to TR 2182................................................................................................................................... 62.4 Detectors to TR 2179................................................................................................................................... 62.5 SCOOT Detectors........................................................................................................................................ 6

3. POWER SUPPLIES ..................................................................................................73.1 Power Supply Options ................................................................................................................................ 73.2 Use of Controller mounted Low Voltage AC Supply kits ........................................................................ 8

3.2.1 Cable lengths using the tables ............................................................................................................... 93.2.2 Cable lengths by calculation................................................................................................................ 12

3.3 Use of Signal head mounted Low Voltage ac Supply ............................................................................. 153.4 Use of Additional 27.5 volt dc detector supply........................................................................................ 153.5 Pelicans with MVDs Supplied to Previous DETR Specifications.......................................................... 15

4. CABLING ................................................................................................................164.1 General ....................................................................................................................................................... 164.2 Examples .................................................................................................................................................... 16

4.2.1 Single Pelican with Signal head-mounted 24v ac supply .................................................................... 164.2.2 Single Pelican with controller mounted 24v ac supply........................................................................ 17

5. DETECTOR INSTALLATION..................................................................................185.1 Location of AGDs...................................................................................................................................... 18

5.1.1 TR2123 detectors (vehicle approaches) .............................................................................................. 185.1.2 On-crossing detectors (TR2179) ......................................................................................................... 185.1.3 Kerbside detectors (TR2182) .............................................................................................................. 19

5.2 Mechanical Installation ............................................................................................................................ 195.3 Electrical Installation................................................................................................................................ 20

5.3.1 Connections – TR2123 vehicle detector.............................................................................................. 205.3.2 Connections – TR2179 on-crossing detector....................................................................................... 215.3.3 Connections – TR2182 Kerbside detector........................................................................................... 21

5.4 Fitting 24v ac Power Supply into STCL signal lantern ......................................................................... 225.5 Fitting 24v ac Power Supply into non-STCL Signal lantern ................................................................. 22

6. CONTROLLER MOUNTED AC POWER SUPPLY.................................................236.1 General ....................................................................................................................................................... 236.2 Location...................................................................................................................................................... 236.3 Wiring ........................................................................................................................................................ 24

7. CONTROLLER INTERFACING ..............................................................................257.1 Buffering .................................................................................................................................................... 257.2 Signal Polarity ........................................................................................................................................... 257.3 Dynamic and Static Detection .................................................................................................................. 25


667/HE/20665/000 Issue 4 Page 3 of 31Use, duplication or disclosure of data contained on this sheet is subject to the restrictions on the title page of this document.

8. TESTING.................................................................................................................268.1 Safety Tests ................................................................................................................................................ 268.2 Detection Tests........................................................................................................................................... 26

8.2.1 Dynamic Detection.............................................................................................................................. 268.2.2 Static Detection ................................................................................................................................... 26

9. PART NUMBERS....................................................................................................27

APPENDIX A - ABOVE GROUND DETECTOR MOUNTING & WIRING DRAWINGS 28

TABLES

TABLE 1 – DETR SPECS............................................................................................................................................ 5TABLE 2 - POWER SUPPLY CURRENT .................................................................................................................. 7TABLE 3 - POWER SUPPLY CHOICE...................................................................................................................... 8TABLE 4 - TRANSFORMER SPECIFICATIONS...................................................................................................... 9TABLE 5 - CABLE LENGTHS FOR MULTIPLE CABLES - 50 VA TRANSFORMER........................................ 10TABLE 6 - CABLE LENGTHS FOR MULTIPLE CABLES - 160 VA TRANSFORMER...................................... 10TABLE 7 - CALCULATION OF MAXIMUM CABLE LENGTH (CONTROLLER-MOUNTED AC SUPPLY) .. 13TABLE 8 - NUMBER OF AGD200 SERIES USING A COMMON CABLE SUPPLIED BY 27.5V DC PSU....... 15TABLE 9 - MAINS VOLTAGE CABLE ................................................................................................................... 16TABLE 10 - EXTRA LOW VOLTAGE CABLE....................................................................................................... 16TABLE 11 - 16 CORE CABLE.................................................................................................................................. 17TABLE 12 - CONNECTOR PINOUT........................................................................................................................ 20TABLE 13 - CONNECTOR PINOUT........................................................................................................................ 21TABLE 14 - CONNECTOR PINOUT........................................................................................................................ 21


667/HE/20665/000 Issue 4 Page 4Use, duplication or disclosure of data contained on this sheet is subject to the restrictions on the title page of this document.

1. INTRODUCTION

1.1 PurposeThis handbook is the fifth of a series of General Traffic handbooks which cover common aspectsof planning, installation and commissioning of STCL traffic controllers and associated streetequipment.

1.2 ScopeThis handbook covers detection equipment that is mounted on traffic signal poles, as opposed toloop detectors which rely on wire loops buried in the road surface. Equipment for detectingpedestrians on crossings such as ‘Puffins’ as well as equipment for detection of road vehicles iscovered.

It includes cabling and power supply requirements and aspects of testing special to AboveGround Detectors.

1.3 Related Documents667/HE/20661/000 - Book 1 - General Principles

667/HE/20662/000 - Book 2 - Signals and Poles

667/HE/20663/000 - Book 3 - Detectors and Cable Terminations

667/HE/20664/000 - Book 4 - Installation and Testing

AGD Ltd Product handbooks are available to STCL Field Service personnel in the AGDHandbooks folder in Plestcl01/Public/Product handbooks/Road Signals on the Poole site server.

1.4 GlossaryAGD Above Ground Detector (Note that one of the companies supplying above

ground detectors is called AGD Ltd.)

DETR Department of Environment, Transport and the Regions

ELV Extra Low Voltage This term is defined slightly differently by the IECand the IEE but in both cases denotes a supply voltage of less than 50 voltsi.e. substantially below mains voltage.

IEC International Electrotechnical Commission

IEE Institute of Electrical Engineers

MVD Microwave Vehicle Detector

STCL Siemens Traffic Controls Limited



2. AVAILABILITY OF ABOVE GROUND DETECTORS

2.1 GeneralA detector is designated as 'Above Ground' by virtue of not requiring wire loops, pads or otherequipment to be buried in the road surface.

They are mounted above the road surface, typically on the top of traffic signal poles. AboveGround Detectors may be designed for detection of vehicles or pedestrians - separate DETRspecifications apply to each type. At the time of writing detectors to the following HighwaysAgency specifications are available:-

Table 1 – DETR Specs

TR2123A

(dynamic requirements only)

Specification for Above Ground Detector Systems for useat Permanent Traffic Signals

TR2123A

(dynamic and static requirements)

Specification for Above Ground Detector Systems for useat Permanent Traffic Signals

TR2131A Specification for advanced above ground detector systemfor use at Permanent Traffic Signal Installations

TR2179A Specification For Above Ground On-Crossing PedestrianDetection Systems

TR2182A Specification for Kerbside Pedestrian Detection Systemsfor use at Puffin Crossings.

Note that the letter following the specification number denotes the issue state. It is omittedelsewhere in this handbook.

A summary of part numbers is to be found in section 9.

2.2 Detectors to DETR Specification TR2123Above ground detectors, approved to DETR specification TR2123 may be used for detection ofvehicles at intersection controllers, Pelicans and Puffins in lieu of loop detectors.

DETR specification TR2123 calls for the detection of all moving vehicles present at a distance ofbetween 10 and 15 metres from the detector and detection of static vehicles between 0 and 3metres from the detector. However most detectors to TR2123 will meet only the dynamic(moving vehicle) part of the specification. The following Detectors from AGD Systems Ltd.meet TR2123:-

Notes

AGD200-200 TR2123 (dynamic) Unidirectional

AGD200-201 TR2123 (dynamic) Low speed (4 kph)

AGD200-202 TR2123 (dynamic) Bidirectional

AGD200-203 TR2123 (dynamic) Bidirectional Low speed (4 kph)

AGD400-200 TR2123 (static) Passive I/R stop line



For use with Pelicans and Puffins dynamic detection is adequate. For use with intersectioncontrollers static detection (close to stop line) is desirable for some intersections. Where staticstop line detection is required it will be called up by the configuration. This may take the form ofa loop detector close to the stop line in addition to a dynamic AGD. Alternatively an additionalAGD to the static requirements of TR2123 may be employed. In the case of such a hybridarrangement the static detector may be used only to call and must not be used to extend a phase.

If both signals are available the dynamic output must be used for call and extend. The staticoutput must be used only for call.

All TR2123 detectors use extra low voltage ac/dc power supplies, there being no mains voltageoption. Power may be supplied as 24 volts dc or 24 volts rms ac; i.e. a TR2123 AGD may beconnected to an ac or dc supply with no adjustment or alteration required.

2.3 Detectors to TR 2182

The AGD 420-200 is a kerbside detector to TR2182A.

It is designed to detect pedestrians standing on the pavement waiting to cross the road.

2.4 Detectors to TR 2179

The AGD 220-200 is an on-crossing pedestrian detector to TR2179A

2.5 SCOOT Detectors

There are no above ground detectors approved for SCOOT.



3. POWER SUPPLIES

3.1 Power Supply OptionsThe AGDs covered by this handbook may be powered by nominal 24 volts ac or dc and eithermethod may be employed depending upon circumstances. For replacement of AGDs to previousspecifications refer to section 3.5

The power supply should be within +20% of its nominal value, i.e. 19.2v to 28.8v dc or rms ac,and shall not be more than 29 volts under any circumstances.

The current drain of the AGD detectors are shown in table 2

Table 2 - Power Supply CurrentCurrent at 24 volts dc (mA) Current at 24 volts 50Hz ac (mA)

AGD 200-2xx 180 (max) 200 (max)

AGD 400-200 180 (max) 200 (max)

AGD 420-200 21 25

AGD 220-200 180 200

In general STCL controllers are equipped with a 24 volt dc supply for detectors. This may be partof the controller supply system or be present for detector purposes only. This supply may be usedsubject to the following limitations:

There is sufficient spare current capacity.

The voltage drop in the cables does not result in the voltage at the detector beingless than 19.2 volts; this must be calculated assuming the 24v power supply is atthe low end of its tolerance.

For example the T400 main 24 volt dc supply has a +6% tolerance so the maximum voltage is24 + 6% = 25.44 volts which is well within the 29 volt maximum. The minimum voltage is 22.56volts. Therefore if a single AGD200-200 is used with 150 metres of 1 sq mm cable at 0.042ohms per metre with current = 0.3 Amps, the voltage at the AGD will be:

22.56 - (0.042 x 150 x 0.2) = 21.3 volts

which is acceptable.

In general STCL controllers can accommodate internally, an additional supply for detection. Thisapplies to the small and large versions of the T400, the ST800 outercase and the ST700 outercaseproviding that the space is not occupied by other options.

The following flow chart illustrates the power supply choice process:



Table 3 - Power Supply Choice

Calculate total dc load. Refer to tablefor current drawn by detector or as

specified by supplier

Is there sparecapacity on existing

24 volt dc?

Estimate cable lengths andcalculate voltage drop for

each detector

Is voltage atdetector more

than minimum?

24 volt dc maybe used

3 options are available:-a 24v ac supply mounted in controller

b. 24v ac supply mounted in signal headc.27v dc supply mounted in controller

No

Yes

NoYes

If the 24v dc controller supply is not chosen, a controller mounted 24 volt ac supply kit is thepreferred option. The controller mounted kit is preferred as only one may be required percontroller and this is generally more economical. Two sizes of controller mounted ac supply kitsare available to provide up to 6.6 Amps.

3.2 Use of Controller mounted Low Voltage AC Supply kitsThe kits contains a transformer, fusing and termination facilities. There are limitations on thelength of cable allowable for this option as the effect of cable resistance is significant for lowvoltage distribution. The STCL part numbers of the controller mounted kits are:-

Nominal 50VA, 2 Amps:- 667/1/27853/000

Nominal 160VA, 6.6Amps:- 667/1/20292/008The output of the transformer is nominally 25 volts but it will drop if the mains voltage falls tothe legal minimum (207 volts, which is -10% on the standard European voltage of 230 or -13.75% on the standard UK voltage of 240v). Further voltage drops will occur due to the loadingof the transformer, the initial tolerance of the transformer and the resistance of the cable. All ofthese must be allowed for using the following rules:

• The minimum allowed voltage at any time on any detector is 19.2 volts

• This voltage applies at the minimum mains voltage of 207 volts.


667/HE/20665/000Use, duplication or disclosure of data contained on this s

• This voltage applies when the transformer is loaded with all the installed detectors.

• The cable resistance must be allowed for in calculating the maximum permissible cablelengths

The transformer details are shown in Table 4

Table 4 - Transformer specifications

Kit:- 667/1/20292/008 667/1/27853/000

Transformer part number 667/7/15855/005 667/7/00977/007

Resistance Rs 0.309 ohms 1.3 ohms

Worst case no-load voltage at 207 volts mains Vmin 21.26 23.13 v

Maximum current Imax 6.6 A 2 A

The voltage falls by Rs in Table 4 for each amp of current drawn from the transformer. For eachindividual cable there is a voltage drop down the cable of 0.042 volts for each go-and-returnmetre of (1sq.mm) cable. Therefore the current must be calculated for each cable run using thecurrent per detector shown in Table 2 for each detector (Is). The total current must then becalculated for all detectors supplied from the transformer. The maximum length of cable can bethen calculated.

The user may either perform the calculations as later described (sect 3.2.2) or may use the tablesin sect. 3.2.1 which is based on the AGD 200 series detectors.

Note that it is permissible to use 2 or more of the 50VA transformer kits, subject to mountingconstraints instead of a 160VA kit.

3.2.1 Cable lengths using the tablesThe tables apply to detectors connected to a single transformer. The column headings refer to thenumber of detectors connected to transformer on cables other than the cable in question.

Note that it is permissable to connect a kerbside detector, type AGD220-series in addition to theseries 200 detectors without affecting the cable lengths. This is because the current drawn by theAGD220 is small enough to be ignored.

Example

Controller

Cable 1Cable 2

Transformer

A 50VA transformer is proposed feeding 5 AGD200-series detectors. There are 2 off AGDs on one cable and3 off on the other. What are the maximum cable lengths?

Considering cable 2 first, there are 2 other detectorsconnected to the transformer so with 3 detectors on thiscable we can have up to 100m using single conductors or200m using parallel conductors.

For Cable 1 there are 3 other detectors connected to thetransformer so with 2 detectors on this cable we can haveup to 100m using single conductors or 250m usingparallel conductors.

Issue 4 Page 9heet is subject to the restrictions on the title page of this document.



Table 5 - Cable lengths for multiple cables - 50 VA transformer

No other Series 200 detectors connectedto transformer

1 other Series 200 detectorsconnected to transformerDetectors on

this cable 1 2 3 4 5 1 2 3 4

Cable length50m S S S S S S S S S100m S S S P P S S S P150m S S P P S S S P200m S S P S P P250m S P P S P

2 other Series 200 detectorsconnected to transformer


this cable 1 2 3 4 1 2 3 4

Cable length50m S S S S S S S S100m S S S P S S P P150m S S P S P P200m S P P S P250m S P S P

S = Single conductor out and return. P = Parallel conductors out and return

Table 6 - Cable lengths for multiple cables - 160 VA transformerNote that this table applies to issue 2 of the transformer 667/7/15855/005



this cable 1 2 3 4 1 2 3 4

Cable length50m S S S S S S S S100m S S S P S S S P150m S S S P S S P P200m S P P S P P250m S P P S P





this cable 1 2 3 4 1 2 3 4

Cable length

50m S S S S S S S S

100m S S S P S S S S

150m S S P P S S P P

200m S P P S P P

250m S P S P



this cable 1 2 3 4 1 2 3 4

Cable length50m S S S S S S S S100m S S S P S S S P150m S S P P S P P P200m S P P S P P250m S P S P



this cable 1 2 3 4 1 2 3 4

Cable length50m S S S S S S S S100m S S P P S S P P150m S P P P S P P200m S P S P250m S P S P



10 to 13 other Series 200detectors connected to

transformerDetectors on

this cable 1 2 3 4

Cable length50m S S S S100m S S P P150m S P P200m S P250m P P

3.2.2 Cable lengths by calculationThis section is provided for cases where the tables cannot be applied, for example wheredetectors other than the AGD 200 series are used.

First calculate the lowest transformer voltage under worst case conditions using the totaltransformer current:

Vmin = Vmin - (Rs x total transformer current in Amps)Then subtract the minimum voltage at which the detector will work (19.2 volts). This gives themaximum voltage drop which can be allowed in any cable.

Max allowed voltage drop = Vmin - 19.2

The maximum allowable length for each cable can then be calculated:

Maximum cable length = Vmin - 19.2current x 0.042 (0.042 is the cable resistance in

ohms per metre)

If longer cables are required, the arrangements must be revised. For example by using two cablecores in parallel the maximum cable length changes to:

Vmin - 19.2current x 0.021

Running separate cables to each post improves the situation since the calculation applies to eachcable, so that each cable will take less current. All loads on each cable must be allowed forincluding pedestrian crossing detectors and kerbside detectors.

Where the situation is more complicated due to sharing of cables it will be necessary to calculatethe voltage at each detector - This voltage must be at least 19.2 volts.

The voltage at the end of any single cable is given by subtracting 0.042 x the length of the cablein metres x the current in the cable from the voltage at the start of the cable. This applies to 1 sqmm cable with a separate return conductor for each run. This is based on the out-and-returnresistance of the cable being 0.042 ohms per metre.

The calculations may be worked out using the tabular form shown below:



Table 7 - Calculation of Maximum Cable Length (Controller-mounted ac supply)

Cable1

Cable2

Cable4

Cable3

Current + + + =

TotalCurrent

x Rs = Volts

21.26 - = Volts

(Lowest transformervoltage)

(Transformervoltage drop)

- 19.2 =

Amps

(Maximum allowablevoltage drop in any cable)

x 0.042 =(or 0.021 forconductors in

parallel)

Maximum allowablecable length =

=Metres

(cable 1)

Voltage dropin cable 1

Rs = 0.309 for 160 VA kitand 1.3 for the 50VA kit

Note that the above chart yields the maximum length of one cable. The calculation within thedashed area must be repeated for the other cables.

The calculation may conveniently be carried out with a spreadsheet. The following examplesshows the use of Microsoft Excel to calculate cable lengths for the 50vA and 160vA kits. Thetext boxes on this spreadsheet have been added to make visible the formulae to allow the readerto recreate a working spreadsheet.



Single ParallelCurrent on cable number 1 0.425 Amps Max length:- 98.18 196.36Current on cable number 2 0.4 Amps Max length:- 104.32 208.63Current on cable number 3 0.425 Amps Max length:- 98.18 196.36Current on cable number 4 0.425 Amps Max length:- 98.18 196.36Current on cable number 5 Amps Max length:- n/a n/aCurrent on cable number 6 Amps Max length:- n/a n/aCurrent on cable number 7 Amps Max length:- n/a n/aCurrent on cable number 8 Amps Max length:- n/a n/aCurrent on cable number 9 Amps Max length:- n/a n/aCurrent on cable number 10 Amps Max length:- n/a n/aTotal transformer current 1.675 AmpsVoltage on Transformer at min. mains 20.953 VoltsAllowable cable drop 1.7525 Volts

Calculates the maximum cable length for AGDs being supplied from a controller-mounted AGD supply transformer kit 667/1/20292/010

Fill in the current on each cable (up to 10) and read the maximum length in metres from the yellow cells

Notes:-Assumes cable is 1.0sq.mmCells F3 to F12 same as cell F3 but with references to B3 changed to suit rowThe minimum voltage allowed at the AGD I/P is 24v less 20% = 19.2 volts.

Cell F3=IF(B3=0,"n/a",(B14-19.2)/(B3*0.042))Cell G3 is same but with 0.021 instead of 0.042 to calculate for parallel wires

Cell B13=SUM(B3:B12)

Cell B14=23.13-1.3*B13

Cell B15=B14-19.2

The 0.042 figure is derived from the cable resistance of 0.042 ohms/metre for 1sq.mm. cable.

Single ParallelCurrent on cable number 1 1 Amps Max length:- 62.01786 124.0357Current on cable number 2 0.85 Amps Max length:- 72.96218 145.9244Current on cable number 3 0.4 Amps Max length:- 155.0446 310.0893Current on cable number 4 Amps Max length:- n/a n/aCurrent on cable number 5 Amps Max length:- n/a n/aCurrent on cable number 6 Amps Max length:- n/a n/aCurrent on cable number 7 Amps Max length:- n/a n/aCurrent on cable number 8 Amps Max length:- n/a n/aCurrent on cable number 9 Amps Max length:- n/a n/aCurrent on cable number 10 Amps Max length:- n/a n/aTotal transformer current 2.25 AmpsVoltage on Transformer at min. mains 21.80475 VoltsAllowable cable drop 2.60475 Volts

Notes:-1. Assumes cable is 1.0sq.mm2. Cells F4 to F12 same as cell F3 but with references to B3 changed to suit row

Cell B13=SUM(B3:B12)

Cell B14 = B14-19.2

Calculates the maximum cable length for AGDs being supplied from a controller-mounted AGD supply transformer kit (160VA) 667/1/20292/008Fill in the current on each cable (up to 10) and read the maximum length in metres from the yellow cells

The 0.042 figure is derived from the cable resistance of 0.042 ohms/metre for 1sq.mm. cable.If you double up the go-and-return cores this reduces to 0.021 (colunm G)Cell F3=IF(B3=0,"n/a",(B14-19.2)/(B3*0.042))

Cell B14= 22.5 - 0.309 * B13



3.3 Use of Signal head mounted Low Voltage ac SupplyThe signal head mounted kit - 667/1/20292/007 - contains a transformer to be mounted on thespare position on the lower transformer bracket or on the inside of the signal head case if thisposition is not available. The kit can supply 1.5 Amps.

If signal head mounted ac power supply kits are employed, each pole equipped with AGDs willrequire its own individual kit.

3.4 Use of Additional 27.5 volt dc detector supplyIf an existing controller is fitted with one of the 27.5 volt power supplies it may used to powerAGDs. This is not available for new installations.

Table 8 shows the maximum cable lengths allowable using a single cable to supply the AGD200series supplies (180mA dc) with these supplies.

Table 8 - Number of AGD200 series using a common cable supplied by 27.5v dcPSU

Number of detectors on one cable run

Max cable runfrom Controller

1-2 3 4 5 6 7 8

100m S S S S S S S

125m S S S S S S P

150m S S S S S P P

175m S S S S P P P

200m S S S P P P P

250m S S P P ----- Not allowed -----

S = Single conductor out and return. P = Parallel conductors out and return

Assumes 1mm cable (Out + return resistance = 0.042 Ohms per metre)

3.5 Pelicans with MVDs Supplied to Previous DETR SpecificationsMVDs to DETR specification MCE 0114 or TR0114, and supplied under the part number series667/7/15087/xxx have been previously used for Pelicans. These have been supplied as 240 voltac mains working or 24 volt dc, working from the T400 detector power supply. Where it isnecessary to replace an MCE 0114 detector, the TR2123 dynamic detector may be used (e.g. anAGD200-200). As the power consumption of the TR2123 detector is not more than theMCE/TR0114 detectors the same cable lengths apply. For completeness the remainder of thissection contains cable information prepared for use of MCE 0114 detectors with the ST800.

The ST800 controller can provide a maximum current of 700mA at 24v dc for poweringdetectors. This restriction overides the effect of the cable length so that cable lengths up to 300mare acceptable for any number of detectors subject only to the maximum current of 700mA.



4. CABLING

4.1 GeneralBefore deciding upon cabling, individual Customer requirements must be taken into account;particularly any requirements for separating extra low voltage and mains voltage cores. Refer tosection 3.1 for calculations of voltage drops which must be taken into account.

4.2 Examples

4.2.1 Single Pelican with Signal head-mounted 24v ac supplyThis example assumes that 2 AGDs - one for each direction - are mounted on a single pole. Ituses one 12 core cable for signals and another 12 core cable for low voltages.

Table 9 - Mains Voltage CableSIGNAL CORE

RED 1AMBER 2GREEN 3RED MAN 4GREEN MAN 5WAIT INDICATOR 6WAIT INDICATOR NEUTRAL 7NEUTRAL (LAMP RETURN) 8SOLAR CELL & AGD SUPPLY 9SOLAR CELL 10SPARE 11SPARE 12

Table 10 - Extra Low Voltage CableSIGNAL CORE

AGD 1 SIGNAL RELAY 1AGD 2 SIGNAL RELAY 2AUDIO 3AUDIO 4PUSHBUTTON 5PUSHBUTTON & AGD COMMON 6SPARES 7 - 12



4.2.2 Single Pelican with controller mounted 24v ac supplyThe following example assumes that 2 AGDs are mounted on a single pole and that there is nocustomer requirement preventing extra low voltage and mains voltage conductors sharing thesame cable. It must be emphasised that this is not a recommended configuration and may only beused for a customer who will accept this practise to minimise costs.

It uses a single 16 core cable to accommodate two AGDs - one for each direction. If a Solar Cellis required it must be placed on a different pole or a 20 core cable could be used. If there is arequirement for spare cores then a 20 core cable would be used. If both are required as well asspare cores then an additional cable would be needed. Note that the AGD supply must beindependent of the mains neutral - it requires its own supply and return cores (13 and 14 in thiscase).

Table 11 - 16 Core CableSIGNAL CORE

RED 1 AMBER 2 GREEN 3 RED MAN 4 GREEN MAN 5 PUSHBUTTON 6 PUSHBUTTON & AGD COMMON 7 WAIT INDICATOR 8 WAIT INDICATOR NEUTRAL 9 AUDIO 10 AUDIO 11 NEUTRAL (LAMP RETURN) 12 AGD SUPPLY 13 AGD SUPPLY 14 AGD 1 SIGNAL RELAY 15 AGD 2 SIGNAL RELAY 16



5. DETECTOR INSTALLATION

5.1 Location of AGDsNote that it is essential for all types of AGD that the detector has an uninterrupted view of thetarget area. It must not be blocked by such items such as backing boards.

5.1.1 TR2123 detectors (vehicle approaches)The detector should normally be located on the nearside primary signal pole at a height of 3 to 5metres. The location on the primary pole is the first choice - not a requirement: It may be fittedon another pole if circumstances dictate. The following factors influence position:

1. Line of sight obstruction such as signs, trees etc.

2. More than two lanes on approach - one required on nearside pole and one onoffside.

3. Road layout permits better aim from offside pole.

4. Cabling requirements.

5.1.2 On-crossing detectors (TR2179) The detectors are mounted in pairs on diagonally opposite poles to cover the area of thecrossing:-

Detectionzone

Kerb

Kerb

Carriageway

Each detector must be aimed at the opposite kerb.

There must be no obstruction between the front face of the detector and the detection zone, i.e.no obstruction by backing boards or signal aspects.

Note that where using the AGD220 series detectors manufactured by AGD Systems Ltd. it isreccomended that facing pairs of detectors consist of one odd and one even serial number. Thesedetectors are supplied in 2 frequency variants identified by odd and even serial numbers tominimise mutual interference.


667/HE/20665/000Use, duplication or disclosure of data containe

5.1.3 Kerbside detectors (TR2182)

Kerbside detectors should be aligned downwards to cover the area of the kerb adjacent to thecrossing. The detector must be mounted so that no obstruction is between the detector and thedetection zone.

Carriageway

PavementDetection zone

Detector Mounted on pole whichhas the pushbutton boxPole

0.8m Kerb

The optimum position for the detector is 0.8m from the edge of the carriageway.Mounting height to be between 3m and 4m.It should be aligned parallel to the kerb edge and face as far downwards as possible:-

5.2 Mechanical InstallationFull instructions are provided on in Appendix A.

Refer to the Installation and C667/HE/20662/000 for further deta

AGD 420 shown on pole-mounted bracket.

Note that detector has been set to maximumdeclination.

Issue 4 Page 19d on this sheet is subject to the restrictions on the title page of this document.

drawings 667/CF/20292/007 and /008 and which are included

ommissioning Handbook number 3 – Signals and Polesils on mechanical installation.



5.3 Electrical Installation

5.3.1 Connections – TR2123 vehicle detectorThe detector is equipped with a captive lead with a 9 pin 'Buccaneer' connector. The connectorpinout is defined in the TR2123 specification. It is reproduced here for completeness:

Table 12 - Connector PinoutPin Function Detector cable Wire Colour Pre-Wired Lead Colour

1 24v Red Red

2 24v Black Black

3 Earth/screen Green/Screen Green/Yellow

4 Common White White

5 N/C-D Yellow Yellow

6 N/O-D Blue Blue

7 N/O-S Violet Violet

8 N/C-S Orange Orange

9 Spare Pink/Brown Not connected

The mating half of the connector, pre-wired with 1.5 metres of multicore cable is supplied withthe AGD. (See column 4 of Table 12 above).

Cut off the unused wires from the 9 pin 'Buccaneer' connector with the flying leads, leaving theearth (green/yellow) the common (white) the 24 volt wires and the signal wires as applicable(blue if dynamic close-to-detect only required).

Fit the connector into the lantern and make the power connections as per section 3.3 if a signalhead transformer is to be used.

To complete the connector wiring, sleeve the remaining wires, including the 24v power wires if acontroller mounted power supply is employed, using the 6mm sleeving. Route to top capalongside other wires and connect to terminals. The earth wire must be connected to the earthterminal block.

1

2

34

5

6

78

9

Pin layout of Buccaneer socket (non-wiring side).



5.3.2 Connections – TR2179 on-crossing detector

On-crossing detectors are used in pairs but should be wired into separate controller inputs.Conditioning is used in the controller to ‘OR’ the inputs. To meet the requirements of TR2179Athe ‘open-to-detect’ output must be used (pin 5).

Table 13 - Connector PinoutPin Function Detector cable Wire

ColourPre-Wired Lead Colour

(where supplied)

1 24v Red Red

2 24v Black Black



5 Output (O/C = detect) Yellow Yellow

6 Output (S/C = detect)** Blue Blue

7 Spare Spare Violet

8 Spare Spare Orange

9 Spare Spare Pink/Brown

** This connection is provided by some manufacturers but is not permitted for Puffins.

5.3.3 Connections – TR2182 Kerbside detector

Table 14 - Connector PinoutPin Function Detector cable Wire

ColourPre-Wired Lead Colour

(where supplied)

1 24v Red Red

2 24v Black Black



5 Output (O/C = detect) Yellow Yellow

6 Output (S/C = detect)** Blue Blue

7 Spare Spare Violet

8 Spare Spare Orange

9 Spare Spare Pink/Brown

**This connection is provided by some manufacturers but is not permitted for Puffins.



5.4 Fitting 24v ac Power Supply into STCL signal lanternDrawing 667/CF/20292/007 shows the fitting of the transformer and positioning of connector inan STCL signal head.

In some cases the customer may insist on separate terminal blocks for extra low voltage andmains voltage terminations. If so it may be necessary to fit an additional terminal block. In anycase separate terminal blocks should be used if available.

The following procedure assumes that the 9 pin 'Buccaneer' pre-wired socket has been fitted intothe lantern.

1. Decide on the transformer mounting position. Preferred mounting position is under 'Green'transformer, similar to existing 'Amber'. Alternative mounting position is on rear of casebehind red aspect - see drawing 667/CF/20292/007. In this case drill holes for transformer asshown on drawing.

2. Cut red, black and green/yellow wires from 9 pin 'Buccaneer' socket to length to reach themounting position and strip ends to suit faston crimp terminals (ring tag for green/yellow).Crimp a (red) faston terminal to each of the red and black wires. If the transformer is beingmounted on the bracket crimp a ring tag to the green/yellow using the correct crimp tool.Connect the red and black to transformer terminals (or if preferred connect after transformerfitting).

3. Fit the transformer using screws and shakeproof washers.4. If the mounting position is on the bracket under 'Green' transformer, secure the green yellow

earth leads from the transformer winding under one of the mounting screws.5. If the transformer is being mounted on rear of the case the earth wire included in the kit will

be required. Crimp the green yellow wire from the connector along with the green yellow wirein the kit into a single ring tag. Secure the ring tag under one of the transformer securing nuts.

6. Sleeve blue and brown flying leads as existing transformers using 6mm sleeving. Identifyloose ends with white ident sleeves. Connect to terminal block in pole cap. Connect earth leadif applicable to the earth terminal block.

5.5 Fitting 24v ac Power Supply into non-STCL Signal lanternThe following procedure assumes that the 9 pin 'Buccaneer' pre-wired socket has been fitted intothe lantern.

1. Follow the same procedure as described in section 5.4 except that there may not be amounting position for the transformer. The transformer must be mounted on the inside of thecase by means of 4 stainless screws, nuts and washers supplied as part of the kit. Select aposition for the transformer and drill 4 off 4mm holes to the hole pattern on the transformerlugs. Mount the transformer inside the case with the screw heads on the outside. Use the plainwashers beneath the screw heads and shakeproof washers under the nuts.

2. Wiring follows the same procedure as for STCL lanterns.



6. CONTROLLER MOUNTED AC POWER SUPPLY

6.1 GeneralController mounted AGD ac power supply kits are available - part number 667/1/20292/008 and667/1/27853/000. These contain a 24 volt transformer together with mounting and wiringhardware. Note that the location is also used on some controllers for other optional facilities suchas low voltage wait indicators so a check must be made to ensure space is available. Refer tosection 3.2 for information regarding capacity and cable lengths.

If a T500 is fitted into a GEC 104 or 125 outercase the AGD transformer will normally bemounted in the signal head.

6.2 LocationFor T400L & S controllers the mounting position is on the additional termination panel whichshould be called up if not already fitted. Drawing 667/CF/20292/008 shows mounting detailsand is included at the end of this handbook.

In an ST800 the transformer is mounted on the left hand side panel. The preferred position is inone of the locations at the bottom of the panel, but any vacant position may be used. Drawing667/GA/27067/000 - ST800 Additional Panel Assembly - shows various kits mounted on thispanel. This drawing, the current issue of which is available on the STCL handbooks directory,shows preferred positions for items mounted on this panel. The drawing is not vital for fieldinstallation of the transformer.

If the 50VA kit is used, the transformer is secured with 2 of the screws in the kit which are 4mmself-tapping. The panel has the following repeated hole pattern:-

66

39

The keyhole slots are not used in thisapplication and are shown for reference.

The transformer is secured with 2 screwsin diagonally opposite holes.

The earth tag should be secured under oneof the screw heads with a shakeproofwasher under the tag.



In an ST700 controller case there are 4 drilled holes for the 50 VA version in the chassis. Thetransformer is mounted using the 4 off M4 screws in the kit 667/1/27853/000.

DetectorRack

OMU(if

fitted)

Transformer

Screw headson outside

ST700Chassis

M/SPanel

ManualPanel

Transformerfoot

EarthLead

Shakeproofwasher

Plainwasher

Fixings Detail

In general any location which provides mechanical support for the transformer and suitableaccess for wiring may be employed. Consideration should be given to retaining access to otherequipment and to maintaining the water resistance and corrosion resistance of the cabinet.

6.3 WiringThe transformer has captive leads for the primary side and a fused screw connection terminalblock for the secondary. The primary leads must be supported as per standard wiring practice andshould be connected to a fused supply which is live whenever the controller is switched on, i.e.from the same place as the main controller logic supply.

The connection to the outgoing feeder cable cores may be routed directly to the terminal block onthe transformer. This is the preferred connection method. Alternatively the cable may be routedvia a terminal block on the termination panel.

The unfused side of the transformer output has a flying green/yellow lead with a ring tag whichmust be connected to earth by means of one of the mounting screws. This mounting screw mustbe bonded to earth.



7. CONTROLLER INTERFACING

7.1 BufferingAll AGDs are regarded as external. Buffered inputs must be used for external devices; thehandbook for the controller should be consulted.

7.2 Signal PolarityDETR specification TR2123 calls for both close-for-detect and open-for-detect contacts to beavailable. Normal STCL practice is for close-to-detect to be employed. Refer to section 5.3.1 forconnector details.

7.3 Dynamic and Static DetectionDETR specification TR2123 calls for the detection of all moving vehicles at a distance of 10 to15 metres from the detector and detection of stationary vehicles between 0 and 3 metres from thedetector. However not all detectors approved to TR2123 meet the requirements for detection ofstationary vehicles. Refer to section 9 for details of part numbers.

For use with Pelicans and Puffins, dynamic detection is adequate. For use with intersectioncontrollers static detection (close to stop line) is desirable for some intersections. Where staticstop line detection is required it will be called up by the configuration. This may take the form ofa second AGD targeted at the stop line area or a loop detector close to the stop line in addition toa dynamic AGD. In the case of such a hybrid arrangement the stop line detector may be used onlyto call and must not be used to extend a phase.

If both signals are available from the same AGD, the dynamic output must be used for call andextend. The static output must be used only for call.



8. TESTING

8.1 Safety TestsIf the AGD is being installed on a new installation no additional testing is required apart fromincluding the external metallic parts of the AGD and brackets in the earth loop impedance testingof the posts. Insulation testing should include the AGD cables (but do not subject the AGD itselfto insulation testing). If the AGD is being fitted to existing equipment the installation shouldundergo the routine safety tests including the above - see handbook 4 (667/HE/20664/000).

8.2 Detection TestsDetectors to DETR spec TR2123 are equipped with an LED, visible from below the unit toindicate detection. Alignment is carried out using the clamps on the bracket to adjust the aim.

8.2.1 Dynamic DetectionAdjust the aim until the detector reliably detects cars moving towards the stop line. Detectionmust occur by the time that the car has come within 35 metres of the stop line.

8.2.2 Static DetectionAdjust the aim until the detector reliably detects stationary cars which have part of theirbodywork in a zone stretching from the stop line to 3 metres upstream. It is allowable to detectstationary cars between 3 metres and 6 metres from the stop line.



9. PART NUMBERS

This section details the STCL part numbers of AGDs and related kits and some manufacture’spart numbers.

STCL part numbers

AGDs to TR2123 (dynamic detection only) 667/7/24820/000

AGD 24 volt ac Power supply kits:

for signal head mounting 667/1/20292/007

for controller mounting 667/1/20292/008

Signal head mounted AGD power transformer 667/7/00977/004

Controller mounted AGD power transformer 667/7/15855/005

Modification drawing to fit ac power supply in signal head 667/CF/20292/007

AGD PSU Controller mounting 667/1/20292/008

Additional Panel Assy (ST800) 667/GA/27067/000

See drawings following Appendix A of this handbook.

Manufacturer’s part numbers (AGD Systems Ltd.)

AGD 200-200 Vehicle detector

AGD 200-201 Vehicle detector – low threshold speed

AGD 200-202 Vehicle detector - bi-directional (4km/hr)

AGD 200-203 Vehicle detector - bi-directional – low threshold speed(4km/hr)

AGD 420-200 Pedestrian kerbside detector

AGD 220-200 On-crossing detector

AGD 400-200 Passive infra-red stopline detector (TR2123)



APPENDIX A - ABOVE GROUND DETECTOR MOUNTING & WIRING DRAWINGS

150

8mm16.7mm

16.7mm

33.3mm

33.3mm124.5mm

4 off holes3.5mm dia

Detector to be mountedon horrizontal arm oflantern support bracket.Existing bracket mayrequire drilling – seedetail ‘B’

Detail ‘B’Support bracket drilling

Detail ‘A’Holes for Buccaneer

Cut hole pattern on centre or onside of case, 150mm belowcentre of standard cable entry(see detail ‘A’).Fit pre-wired 9 pin ‘Buccaneer’socket to lantern case as shown

Drill hole 10mm in diameter oncentreline if not already presentand protect the bare metal

INSTRUCTIONS Mount detector on the horrizontal part of the lantern support bracket (drillhole if required).If 24 volts is to be supplied from the controller, then wire the 9 pinconnector direct to the top cap terminal blocks according to theappropriate table in the handbook text.If the power is to be supplied via a signal head transformer then see667/CF/20292/007 and connect as follows:-

Wire pins 1 and 2 of connector to transformer – crimp fastons as requiredWire earth lead from connector pin 3 to transformer earth.Sleeve blue and brown flying leads as from existing transformers using6mm sleeving.Ident loose ends with white ident sleeves and wire to terminal block ontop of post.Wire remaining leads from connector to post-top terminal block

Figure 1 Mounting of AGD and cable termination

The drawings listed below, which are referenced in the text of this handbook, are included afterthis page:

667/CF/20292/007 ......AGD PSU Signal Head Mounting

667/CF/20292/008 ......AGD PSU Controller mounting (T400/500)

These have been included for convenience and are at the issue state current when this handbookwas last edited. Current issues are available from Poole Registry.







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