OPTICOM 764 - Page 61

Intersection Equipment Installation Instructions
61
Table 15-1 Troubleshooting Symptoms, Possible Causes, and Solutions (continued)
Symptom Possible Cause Solution
RADIO LED is off Incorrect wiring. Check wiring at both ends of
radio/GPS cable.
Radio/GPS cable connector
(terminal block) plugged in
backwards.
Plug in terminal block correctly.
Radio/GPS cable damaged or poor
terminations.
Replace cable, redo terminations.
Radio/GPS unit failed. Return unit to GTT for service.
Phase selector failed. Return unit to GTT for service.
No power to radio. Check voltage between violet (+)
and violet/white (–) wires. It should
be about 9.0 VDC.
Unable to communicate with
phase selector.
Communication cable not
connected.
Check cable connection at phase
selector and at computer.
Baud rate incorrect. Using The On-site software, change
baud rate under Environment
options.
Intersection Name not Heard
listed instead of intersection
name.
Name not heard yet. Press Get Intersections Heard button
again.
Name not assigned in intersection. Assign an intersection name.
Unknown Error when
attempting to communicate
with phase selector.
Reset phase selector. Contact GTT Technical Service for
procedure.
Controller locks up or displays
all red when call is placed.
Controller preempt routines not
programmed or programmed
incorrectly.
Re-program controller preempt
routines.
Controller does not cycle to
correct green when call is
placed.
Controller not programmed
correctly.
Program controller.
Preempt inputs not enabled. Enable preempt inputs.
Excess timing delays or minimum
times programmed in preempt
routine.
Program controller to respond to a
priority request as quickly and safely
as possible.
Phase selector output wiring
incorrect.
Wire phase selector outputs
correctly.
Phase selector Logic
Common/Opto-Common not
connected correctly.
Connect phase selector Logic
Common and/or Opto-Common to
controller’s Logic Common.
Phase selector outputs not assigned
correctly.
Configure outputs correctly.
Controller interface (D connector)
wiring incorrect.
Wire inputs correctly.