GTT Opticom GPS System Installation Manual page 53

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Table 9-1. Troubleshooting Symptoms, Possible Causes, and Solutions (continued)
Symptom
RADIO LED is amber.
Unable to communicate with
phase selector.
Intersection Name not Heard
listed instead of intersection
name.
Unknown Error when
attempting to communicate
with phase selector.
Controller locks up or displays
all red when call is placed.
Controller does not cycle to
correct green when call is
placed.
Active Greens window shows
all greens active continuously.
Intersection Equipment Installation Instructions
Possible Cause
Incorrect wiring.
Radio/GPS cable connector
(terminal block) plugged in
backwards.
Radio/GPS cable damaged or poor
terminations.
Radio/GPS unit failed.
Phase selector failed.
No power to radio.
Communication cable not
connected.
Baud rate incorrect.
Name not heard yet.
Name not assigned in intersection.
Reset phase selector.
Controller preempt routines not
programmed or programmed
incorrectly.
Controller not programmed
correctly.
Preempt inputs not enabled.
Excess timing delays or minimum
times programmed in preempt
routine.
Phase selector output wiring
incorrect.
Phase selector Logic
Common/Opto-Common not
connected correctly.
Phase selector outputs not assigned
correctly.
Controller interface (D connector)
wiring incorrect.
Green Sense AC neutral (AC–) not
connected.
Solution
Check wiring at both ends of
radio/GPS cable.
Plug in terminal block correctly.
Replace cable, redo terminations.
Return unit to GTT for service.
Return unit to GTT for service.
Check voltage between violet (+)
and violet/white (–) wires. It should
be about 9.0 VDC.
Check cable connection at phase
selector and at computer.
Using ITS Explorer, change baud
rate under Environment options.
Press Get Intersections Heard button
again.
Assign an intersection name.
Contact GTT Technical Service for
procedure.
Re-program controller preempt
routines.
Program controller.
Enable preempt inputs.
Program controller to respond to a
priority request as quickly and safely
as possible.
Wire phase selector outputs
correctly.
Connect phase selector Logic
Common and/or Opto-Common to
controller's Logic Common.
Configure outputs correctly.
Wire inputs correctly.
Connect green sense common
(white wire) to cabinet common.