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LT12DAB LIGHT TOWER • OPERATION MANUAL — REV. #0 (06/03/11) — PAGE 41
LAMP TROUBLESHOOTING GUIDE
Use the following procedure and wiring diagram on the
next page to determine which of the four lamps is not
functioning:
Connections
1. Make sure that lamp #1 power cable is plugged into
the J1 connector on the T-Bar assembly.
2. Make sure that lamp #2 power cable is plugged into
the J2 connector on the T-Bar assembly.
3. Make sure that lamp #3 power cable is plugged into
the J3 connector on the T-Bar assembly.
4. Make sure that lamp #4 power cable is plugged into
the J4 connector on the T-Bar assembly.
5. With the voltmeter set to the AC position, connect the
negative lead of the AC voltmeter to any (neutral) white
wire on the junction terminal block. This block connects
all the neutral wires (white) in the system.
6. Connect the positive lead of the voltmeter to the output
side of CB1 and observe that 230 VAC is present. Make
sure circuit breaker is ON.
7. Repeat step 1-6 for CB2 thru CB4.
8. If the correct output voltages are present for CB1 thru
CB4 then it can be assumed that the generator is
working correctly and the correct voltage (230 VAC)
are being supplied to the ballast.
TROUBLESHOOTING
Starting
1. Start the generator and verify that there are no
abnormal sounds.
2. Turn CB1 thru CB4 circuit breakers to the ON
position.
3. Wait a few minutes and determine which lamp is not
igniting.
4. If one of the lamps is OFF, disconnect its power cable
and plug it into a receptacle that is known to be working.
DO NOT unplug a power cable from the T-Bar while
power is being supplied by the generator. Always turn
the circuit breaker OFF before unplugging a power
cable.
5. If the lamp still does not ignite after plugging it into a
working receptacle (380-440 VAC present to ignite the
arc tube), then it can be assumed that the ballast for
that lamp is defective. Replace ballast.
Ballast Removal:
1. Remove the power cable from the generator, and make
sure that no voltage is being supplied to the ballast
compartment.
2. Remove the four screws securing the ballast cover,
and remove cover.
3. Make sure to discharge the ballast capacitor.
4. Remove the defective ballast, taking care to guard
against electrical shock when coming in contact with
the ballast and capacitor. The capacitor is known to
store an electrical charge, that when discharged could
result in a harmful shock. Make sure to discharge
capacitor.