SPEEDGATE Installation and Maintenance Manual Revision 1 - MAY 2023
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INSTALLATION INSTRUCTIONS FOR OPTIONAL VEHICLE DETECTORS
Installaon of Vehicle Detecon Ground-Loop Systems
4. The “loops leads” cable used to extend the lead-in to the cabinet should consist of a shielded
twisted pair of wires with high density polyethylene insulaon. The shield should be oated
(le unconnected and insulated) at the splice point between the loop wires and the feeder
cable and should be grounded to earth ground at the cabinet end only. Any other grounding
arrangement can lead to grounded loops and cause errac system operaon.
Loop Perimeter (Imperial Measurement) Number of Turns in the Loop
14 feet to 26 feet 4
27 feet to 45 feet 3
46 feet to 100 feet 2
101 feet and up 1
Loop Perimeter (SI Metric Measurement) Number of Turns in the Loop
4.3 meters to 8 meters 4
8.2 meters to 13.7 meters 3
14 meters to 30.5 meters 2
30.8 meters and up 1
5. All splices MUST be soldered, even when inially formed with crimp type splices.
When soldering, use only enough
localized heat to adequately ow the
solder through the connecon without
melng or burning the surrounding
insulaon. Each splice point must
be protected with a moisture-proof
seal. Failure to observe these two
precauons are the two most common
causes of loop related problems in this
type of system.
6. Another common problem is caused by loose connecons at the terminal strip in the cabinet.
Crimp type terminals should be soldered in the crimp sleeve and the screws securing the
terminals to the terminal strip securely ghtened down. Adding lock washers is a further
deterrent to the screws loosening up due to vibraon or the passage of me�
7. The loop leads from the vehicle loops will need to run directly into the Operator Cabinet.
Channel 1 Loop (which can be congured as an Entrance Loop OR an Exit Loop) typically
terminates into terminal #30 and #31. Channel 2 Loop (conguraon dependent upon Chanel
1 funcon) typically terminates into terminal #32 and #33.
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