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Operation
Light Operation
WARNING
Burn hazard. Never operate lights with a
damaged or missing lens cover. Lamps are
hot and pressurized while in use. Unprotected
lamps can shatter, causing severe injury.
1. Verify the unit is on and running smoothly.
Figure
3-6. Switch main circuit breaker (A) ON
2. See
(I).
3. Switch the individual circuit breakers for the lights
(B) ON (I), one at a time.
4. The ballast indicator lights (C) will turn on and
continue to brighten as the lights warm up, and
then remain on. This confirms power is coming
from the ballasts to the lights.
A
B
MAIN
BREAKER
240V
ON
ON
TURN
MAIN
BREAKER
OFF
120V
BREAKER
120V
Figure 3-6. Light Switches and Breaker
NOTE: If an indicator light does not turn on, see
Troubleshooting
or contact a GMASD.
NOTE: The lights require a warm up period of 5-15
minutes before they reach full output. If the lights are shut
down, they require a cool down period of approximately
ten minutes before they can be switched on again.
NOTE: The light tower uses four 1,100W bulbs. When
checking or replacing the bulbs, wipe them with a clean
cloth to avoid leaving any grease, oil residue or
fingerprints on the glass. Any residue can create a hot
spot on the bulb, causing premature bulb failure.
WARNING
Burn hazard. Lamps become extremely hot
while in use. Allow 10–15 minutes for cooling
before handling or lowering mast. Touching a
hot lens or fixture can cause severe burns.
16
(000277)
C
BALLAST INDICATOR LIGHTS
I
I
I
I
ON
ON
ON
ON
O
O
O
O
MAST LIGHT SWITCHES
400W
400W
Flagger Station Switches
OFF
GLOW PLUG
GLOW
RUN
INDICATOR
PLUG
START
240V
DC
BREAKER
NEUTRAL BONDED TO FRAME
004477
(000278)
Auxiliary Outlets
Figure
3-7. Depending upon the model, the control
See
panel is equipped with one or two 120V GFCI (A) and a
240V Twist Lock (B) outlet for running accessories or
tools from the generator. Power is supplied to the
receptacles any time the engine is running and the main
circuit breaker is switched ON (I).
NOTE: Do not pull more than 1000W from each outlet
when the lights are on. This will overload the generator
and cause the main circuit breaker to trip. Should the
breaker trip, switch off the lights, remove some of the
load to the outlets and wait 10 minutes for the bulbs to
cool before turning them back on.
With all of the lights off, the full generator output may be
used with the 240V twist-lock outlet.
BREAKER
120V
A
Figure 3-7. Auxiliary Outlets
Wet Stacking
The unit is powered by a diesel engine. Diesel engines
are susceptible to wet stacking if lightly loaded. Wet
stacking occurs when an engine is run at less than 30%
of its full load capacity, causing unburned fuel to
accumulate in the exhaust system. Wet stacking can be
detected by continuous black exhaust when the unit is
under a constant load. It can also cause fouling of
injectors and buildup on engine valves. Diesel engines
operate properly when applied loads are between 30%
and 100% capacity. Appropriate generator sizing is
determined by the anticipated load. If the unit is in a wet
stack condition, load the unit heavily for five hours or until
the exhaust is clear.
Engine Derating
All units are subject to derating for altitude and
temperature. Derating reduces the available power for
operating tools and accessories connected to the outlets.
For every increase in 1000 ft (305 m) of elevation, engine
performance for this unit typically drops between 2% and
4%. Also, engine performance decreases about 1% for
every 10ºF (5.6ºC) increase in ambient air temperature
over 72ºF (22ºC).
Owner's Manual for Mobile Light Tower
B
BREAKER
240V
BREAKER
I
O
240V
NEUTRAL BONDED TO FRAME
004478
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Table of Contents
Troubleshooting
