Miller Big Blue 450X Duo CST, Owner'S Manual

Page: 49 / 64

Complete Parts List available at www.MillerWelds.com
OM-247969 Page 45
Repeated LED Flashes
Indicate Status
Blue Yellow Trouble Possible Causes Remedy
2 0
Reduced weld
output.
Output foldback
due to exces-
sive input cur-
rent.
Single phase rating
exceeded.
Reduce output to 200 amperes or less.
High output VA coupled with
a low 230V line.
Check auxiliary power output to verify
230 volts AC is available. If 230 volts
AC is not available, contact Factory Au-
thorized Service Agent. Check weld
settings.
3 0
No weld output.
Remote trigger has been left on.
Remove trigger, wait approximately 5
seconds, and restart.
0
On
continuous-
ly
Unit overheated.
Primary (IGBT) thermistor
over temperature.
Allow unit to cool down.
Secondary thermistor over
temperature.
0
Flashes
continuous-
ly
No weld output.
Thermistor
failure.
Shorted primary (IGBT)
thermistor.
Have Factory Authorized Service Agent
check IGBT thermistors for shorts.
Open primary (IGBT) therm-
istor.
Have Factory Authorized Service Agent
check IGBT thermistors and associated
wiring for opens.
Open secondary thermistor.
Have Factory Authorized Service Agent
check thermistor on output heatsink
and associated wiring for opens.
Shorted secondary
thermistor.
Have Factory Authorized Service Agent
check thermistor on output heatsink
and associated wiring for shorts.
8-12. Troubleshooting Generator
A. Standard Generator Power
Trouble Remedy
No generator power output at AC recep-
tacles; weld output okay.
Reset receptacle supplementary protectors (see Section 7-1).
No generator power or weld output. Disconnect equipment from generator power receptacles during start-up.
Check fuse F1, and replace if open (see Section 8-10). Have Factory Authorized Service Agent check
field excitation circuit.
Reset supplementary protector CB3 (see Section 8-10).
Have Factory Authorized Service Agent check brushes and slip rings, and field excitation circuit.
High output at generator power AC re-
ceptacles.
Have Factory Authorized Service Agent check field excitation circuit.
Low output at generator power AC re-
ceptacles.
Have engine Factory Authorized Service Agent check engine speed, and adjust if necessary.
Check fuse F1, and replace if open (see Section 8-10). If F1 is open, have Factory Authorized Service
Agent check the rotor.