Troubleshooting
32
Owner’s Manual for MLT Light Tower
Troubleshooting the Lights
IMPORTANT NOTE:
Only a qualified electrician
should troubleshoot or repair electrical problems
occurring in this equipment.
(000278)
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.
(000187)
WARNING
Electrocution. Potentially lethal voltages are generated
by this equipment. Render the equipment safe before
attempting repairs or maintenance. Failure to do so
could result in death or serious injury.
Problem
Possible Cause
Solution
Mast Lights Off, but
Ballast Indicators
on Control Panel
are On.
Light fixture is too hot.
Faulty lamp connection.
Lamp broken
Loose lighting
connections
Damaged or loose
electrical cord
Allow light to cool 10-15 minutes before restarting.
Check that the lamp is tight in the socket.
Check for broken arc tube or outer lamp jacket, broken or loose
components in lamp envelope, or blackening/deposits inside tube.
Check the connections inside the mast junction box and each mast light
housing/socket.
Check the mast electrical cord for damage and check the cord connections
inside the control box.
Mast Lights Off,
and Ballast
Indicators on the
Control Panel are
Off.
Loose lighting
connections
Generator output
incorrect.
Low transformer output.
Check the connections inside the control box and inside each ballast box.
Check the incoming voltage to the ballast by checking the available voltage
on the GFCI receptacle. Incoming voltage should be 120V +/- 5V. If voltage
is incorrect, the engine speed may need to be adjusted or generator may
require service.
The voltage from the transformer should read approximately 400VAC as
the light “strikes” (induces an arc), then drop and slowly rise back up to
stabilize at 240-260VAC. On hard wired models,
remove the mast junction box cover and insert the wire probes into the
connector blocks for the light and ground. If proper voltage is not achieved,
perform capacitor check to determine if the capacitor or coil needs
to be replaced.
Mast Lights On But
the Light Output is
Low
Fixture and/or lens is
dirty.
Lamp worn due to
normal use
Damaged or loose
electrical connections
Generator output
incorrect.
Low transformer output
Clean reflective surface inside fixture and both inside and outside surface
of glass lens. Use mild soap and water to clean lens. Other chemicals may
have an adverse effect on the glass.
Replace lamp.
Check the mast coil cord, mast junction box and mast light connections.
Check the incoming voltage to the ballast. Incoming voltage should be
120V +/-5V. If the voltage is incorrect, the engine speed may need to be
adjusted or the generator may require service.
The voltage from the transformer should read approximately 400VAC as the
light “strikes” (induces an arc), then drop and slowly rise back up to stabilize
at 240-260VAC. On hard wired models, remove the mast junction box cover
and insert the wire probes into the connector blocks for the light and ground.
If proper voltage is not achieved, perform capacitor check to determine if the
capacitor or coil needs to be replaced.
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