Troubleshooting (Lamps) - MULTIQUIP LT6D Operation Manual

Symptom
Lamp will not start.
Lamp flickers and goes
out intermittent or
cycling.
LT6D LIgHT TOWeR • OpeRaTIOn manuaL — Rev. #0 (07/16/13) — page 61
Table 13. Lamp Troubleshooting
possible Cause
Lamp Burned Out?
Lamp Loose in Socket?
Lamp Plugs Not Tight?
Defective Ballast?
Low Voltage?
Improper Ballast?
Improper Lamp Operating
Position (Metal Halide only)?
Lamp has been Operating: Cool
Down Time Insufficient?
Improper Ballast?
New Lamp?
Defective Lamp?

troublesHooting (lamps)

Test the lamp in a fixture which is operating properly.
Replace if necessary.
Inspect lamp base to see if there is arcing at center
contact button. Tighten lamp snugly. Check socket for
damage. Replace if defective.
Check plug and receptacle. Tighten if loose.
Interchange ballast plugs in generator enclosure.
If lamp starts, replace ballast. Check ballast wiring
against diagram. Check for swollen capacitor, charred
wiring, core and coil or other signs of excessive heat.
Check line voltage at ballast input. Voltage should
be within 10% of nameplate rating when operating
at normal load. Increase supply voltage or remove
external load.
Proper HID lightswill perform erratically or fail to start
on an improper ballast. The ballast nameplate data
must agree with the line voltage and lamp used.
Improper ballast causes lamp failure. Note: Mercury
lightsof the same wattage will operate properly on
Metal Halide ballasts.
Operating position should agree with the lamp tech.
A BU-HOR lamp can be operated base up vertical to
and including the horizontal and a BD can be operated
base down vertical to, approaching, but not including
the horizontal. A lamp operated beyond the specified
position may not start.
HID lights(High Pressure Sodium, Metal Halide,
Mercury Vapor) require from 4 to 8 minutes cool-down
time before restarting. Switch off breaker and allow
lamp to cool.
Improper ballasting can cause flickering or erratic
operation. In the start-up period the lamp may ignite,
start to warm up and then extinguish (cycle).
Under certain conditions new lightsmay "cycle".
Usually after 3 tries to start at 30 to 60 second
intervals, lightswill stabilize and operate satisfactorily.
Replace lamp.
Solution