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| TROUBLESHOOTING |
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| Table 5. Lamp Troubleshooting | |
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Symptom | Possible Cause | Solution |
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| Lamp Burned Out? | Test the lamp in a fixture which is operating properly. |
| Replace if necessary. | |
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| Inspect lamp base to see if there is arcing at center |
| Lamp Loose in Socket? | contact button. Tighten lamp snugly. Check socket for |
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| damage. Replace if defective. |
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| Lamp Plugs Not Tight? | Check plug and receptacle. Tighten if loose. |
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| Interchange ballast plugs in generator enclosure. |
| Defective Ballast? | If lamp starts, replace ballast. Check ballast wiring |
| against diagram. Check for swollen capacitor, charred | |
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| wiring, core and coil or other signs of excessive heat. |
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| Check line voltage at ballast input. Voltage should |
| Low Voltage? | be within 10% of nameplate rating when operating |
| at normal load. Increase supply voltage or remove | |
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| external load. |
Lamp will not start. |
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| Proper HID lamps will perform erratically or fail to | |
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| start on an improper ballast. The ballast nameplate |
| Improper Ballast? | data must agree with the line voltage and lamp used. |
| Improper ballast causes lamp failure. Note: Mercury | |
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| lamps of the same wattage will operate properly on |
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| Metal Halide ballasts. |
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| Operating position should agree with the lamp tech. |
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| A |
| Improper Lamp Operating | and including the horizontal and a BD can be operated |
| Position (Metal Halide only)? | base down vertical to, approaching, but not including |
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| the horizontal. A lamp operated beyond the specified |
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| position may not start. |
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| HID lamps (High Pressure Sodium, Metal Halide, |
| Lamp has been Operating: Cool | Mercury Vapor) require from 4 to 8 minutes |
| Down Time Insufficient? | time before restarting. Switch off breaker and allow |
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| lamp to cool. |
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| Improper ballasting can cause flickering or erratic |
| Improper Ballast? | operation. In the |
Lamp flickers and goes |
| start to warm up and then extinguish (cycle). |
out intermittent or |
| Under certain conditions new lamps may "cycle". |
cycling. | New Lamp? | Usually after 3 tries to start at 30 to 60 second |
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| intervals, lamps will stabilize and operate satisfactorily. |
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| Defective Lamp? | Replace lamp. |
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page 42 — MLT25 sERIES LIGHT TOWER • operation manual — rev. #0 (11/28/12)
