Fault Diagnosis
5-4
Revision 2 - 20 March, 1997
HP SERIES DIMMER
OPERATING MANUAL
5.8
Fault finding guide
FAULT SYMPTOM
POSSIBLE CAUSE
REMEDY
Overvoltage indication
Loose or missing supply neutral
Faulty supply connections or phase-
neutral swap on supply
Load imbalance
Faulty Supply generator
Loose or missing earth
Ensure good neutral connection
Check supply wiring/colour code
Re-distribute loads
Replace generator
Ensure correct supply earthing
Check wiring / 3 phase plugs
Turn P.Fault OFF until wiring /
generator is repaired
Overtemperature indication
Poor ventilation
Damaged fan
Ambient temp above limit
Use racks with side ventilation
Replace fan
Keep ambient temp below limit
Breaker trips when channel flashed to
near full
Large incandescent load
Excessive load
Faulty breaker
Use Preheat facility
Reduce channel loading
Factory service
Breaker trips after prolonged
operation
Excessive load
Lamp or wiring fault
Faulty breaker
Reduce channel loading
Check lamps and wiring
Factory service
Breaker trips immediately when
channel is driven
Output short
SCR / Triac short
Check lamps and wiring
Factory service
One channel flickers when dimmed -
Drive LED flickers
DMX source problem
Replace control console
One channel flickers when dimmed -
steady Drive LED indication
Faulty channel
Same load flickers on another channel
Factory service
Insufficient or nonlinear load
Intermittent load wiring
All channels flicker when dimmed
Incorrect DMX protocol / wiring
Mains control tones exceed limits
DMX line unterminated
Replace DMX source / wiring
Contact factory
Terminate DMX line
Radio interference
Faulty choke
Factory service
