HC 75C
9-1
SECTION 9: TROUBLESHOOTING
If the unit is suspected to be malfunctioning, refer to the following guide for testing the unit and isolating
the problem. Some minor repairs can be made in the field. Otherwise, call the factory for assistance.
1. Insufficient Output
When the unit does not seem to yield sufficient current through a breaker, the problem could be one
of the following:
a. Insufficient power supply.
b. Loose connection in unit.
c. Incorrect controller range or output tap configuration setting.
d. Poor connections or excessive contact resistance at the breaker. Check cable or stab
connections.
2. Cannot Energize Main Circuit Breaker
a. Main breaker can only be energized when the interlock is clear. Check the status on the
controller.
b. Remove power and inspect the under voltage release mechanism for the main breaker.
3. No Output Current When Initiated
a. Check to see that main circuit breaker is on.
b. Verify that the breaker is reset and not in the trip position.
c. Verify continuity of the breaker contacts.
d. Check LED indicator on SCR trigger board. It should light when initiated.
e. Check voltage out of SCR's when initiated.
WARNING!
SOME TROUBLESHOOTING PROCEDURES REQUIRE OPENING THE TEST
SET, WHICH HAS POTENTIALLY LETHAL VOLTAGES ON EXPOSED
CONDUCTORS. ONLY FULLY EXPERIENCED TECHNICIANS SHOULD
ATTEMPT TO PERFORM THESE PROCEDURES. IF YOU HAVE ANY
QUESTIONS, CONTACT THE PHENIX SERVICE DEPARTMENT.
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