TROUBLESHOOTING

 

 

 

 

 

 

 

Table 5. Lamp Troubleshooting (continued)

 

 

 

Symptom

Possible Cause

Solution

 

 

 

Lamp starts slowly

 

 

(ARC does not strike

Defective Lamp?

Lamp may glow for extended period of time. Replace after

when switch is first

checking voltage and ballast.

 

turned on)

 

 

 

 

 

Circuit breaker trips on

Short Circuit or Ground?

Check wiring against diagram. Check for shorts or ground.

lamp start-up

 

 

 

 

 

 

Normal Lamp

Replace Lamp.

 

Depreciation?

 

 

 

 

 

 

Dirty Lamp or Fixture?

Clean lamp and fixture.

 

 

Interchange ballast plugs in generator enclosure. If lamp

Lamp light output low

Defective Ballast?

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%

 

Wrong Voltage?

of nameplate rating. Check wiring connections for voltage

 

 

loss. Check socket contact point.

 

Improper Ballast?

Check ballast nameplate against lamp data.

 

 

 

 

 

Lamp output and brightness decreases and color changes

 

Normal Lamp

slightly as lamps age. Spot replacement with new lamps

 

Depreciation?

may cause noticeable differences in lamp colors. Group

Lamp colors different.

 

replacement minimizes color differences.

 

 

Dirty Fixture?

Dirty fixtures will cause lamps to appear different in color.

 

 

Clean fixture.

 

 

 

 

 

 

Wrong Lamp?

Check data on lamps which appear different in color. Replace

 

with correct color lamp.

 

 

 

 

 

 

Over Voltage from Power

Check voltage at ballast. Check for current or voltage surges.

ARC tube discolored or

Supply?

Check for shorted capacitors and replace if defective.

swollen.

Improper Ballast?

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 Damaged?

Lamp too firmly in socket or scoring of glass where socket

Short lamp life.

 

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

 

Improper Ballast?

and lamp use. If improper ballast is used, the lamp life will be

 

 

shortened. A mismatch may also cause the ballast to fail.

MLT20 SERIES LIGHT TOWER • operation manual — rev. #0 (01/18/13) — page 43

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Multi Tech Equipment MLT20DCA6 Lamp starts slowly ARC does not strike Defective Lamp?, Lamp start-up, Excessive heat
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MLT20DCA6, MLT20DCA specifications

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