MULTIQUIP LT6k Operation Manual page 63

Symptom
Lamp starts slowly
(ARC does not strike
when switch is first
turned on)
Circuit breaker trips on
lamp start-up
Lamp light output low
Lamp colors different.
ARC tube discolored or
swollen.
Short lamp life.
LT6K LIgHT TOWeR • OpeRaTIOn manuaL — Rev. 2 (09/11/14) — page 63
Table 14. Lamp Troubleshooting (continued)
possible Cause
Defective Lamp?
Short Circuit or Ground?
Normal Lamp
Depreciation?
Dirty Lamp or Fixture?
Defective Ballast?
Wrong Voltage?
Improper Ballast?
Normal Lamp
Depreciation?
Dirty Fixture?
Wrong Lamp?
Over Voltage from Power
Supply?
Improper Ballast?
Lamp Damaged?
Improper Ballast?
troublesHooting (lamps)
Lamp may glow for extended period of time. Replace after
checking voltage and ballast.
Check wiring against diagram. Check for shorts or ground.
Replace Lamp.
Clean lamp and fixture.
Interchange ballast plugs in generator enclosure. If lamp
returns to normal light output, replace ballast. Check for
swollen capacitor, charred wiring, core and coil, or other signs
of excessive heat.
Check voltage at ballast input. Voltage should be within 10%
of nameplate rating. Check wiring connections for voltage
loss. Check socket contact point.
Check ballast nameplate against lamp data.
Lamp output and brightness decreases and color changes
slightly as lights age. Spot replacement with new lights
may cause noticeable differences in lamp colors. Group
replacement minimizes color differences.
Dirty fixtures will cause lights to appear different in color.
Clean fixture.
Check data on lights which appear different in color. Replace
with correct color lamp.
Check voltage at ballast. Check for current or voltage surges.
Check for shorted capacitors and replace if defective.
Lamp operated on ballast designed for higher wattage lamp.
Check ballast nameplate against lamp data.
Check for outer bulb cracks. If air enters outer bulb, arc tube
may continue to burn for 100 hours before failure. Check for
bulb cracks where glass meets the base due to tightening.
Lamp too firmly in socket or scoring of glass where socket
inadvertently touches the lamp bulb. Look for broken arc tube
or loose metal parts. Replace lamp. (Bulb leads will cause
oxidation of metal parts.)
Ballast nameplate data should agree with lamp line voltage
and lamp use. If improper ballast is used, the lamp life will be
shortened. A mismatch may also cause the ballast to fail.
Solution