Troubleshooting - Miller Electric Big Blue 400 PX Owner's Manual

8-11. Troubleshooting

.
Also see Voltmeter/Ammeter help displays to assist in troubleshooting weld problems (see Section 8-10).
Engine speed is controlled by an electronic governor and throttle actuator. Governor adjustment should only be done by a Factory Authorized
Service Agent.
A. Welding
Trouble
No weld output; generator power output
okay at ac receptacles.
No weld output, or generator power out-
put at ac receptacles.
Erratic weld output.
High weld output.
Low weld output.
Low open-circuit voltage.
No remote fine amperage control.
No 24 volt ac output at Remote recep-
tacle RC14.
B. Standard Generator Power
Trouble
No generator power output at ac recep-
tacles; weld output okay.
No generator power or weld output.
Place Process/Contactor switch in a Weld Terminals Always On position, or place switch in a Remote
On/Off Switch Required position and turn remote contactor on (see Section 6-4).
Reset supplementary protector CB8 (see Section 8-9). Check for faulty remote device connected to
RC14.
Check and secure connections to Remote Control receptacle RC14 (see Section 5-9).
Check Voltmeter/Ammeter help displays (see Section 8-10).
Disconnect equipment from generator power receptacles during start-up.
Reset supplementary protector CB3. (see Section 8-9).
Check fuse F1, and replace if open (see Section 8-9). If F1 is open, have Factory Authorized Service
Agent check the voltage regulator module PC3.
Check Voltmeter/Ammeter help displays (see Section 8-10).
Have Factory Authorized Service Agent check brushes and slip rings, voltage regulator module PC3, and
field excitation circuit.
Check and tighten connections inside and outside unit.
Be sure connection to work piece is clean and tight.
Use dry, properly stored electrodes.
Remove excessive coils from weld cables.
Have Factory Authorized Service Agent check brushes and slip rings.
Have Factory Authorized Service Agent check main control module PC1 and hall device HD1.
Check engine speed, and have Factory Authorized Service Agent adjust if necessary.
Check fuse F1, and replace if open (see Section 8-9). If F1 is open, have Factory Authorized Service
Agent check the slip rings and brushes, rotor, and voltage regulator module PC3.
Check engine speed, and have Factory Authorized Service Agent adjust if necessary.
Have Factory Authorized Service Agent check main control module PC1, voltage regulator module PC3,
and main rectifier.
Repair or replace remote control device.
Check and secure connections to Remote Amperage Adjust receptacle RC14 (see Section 5-9).
Reset supplementary protector CB8 (24 volt) (see Section 8-9).
Reset receptacle circuit protectors (see Section 7-1).
Disconnect equipment from generator power receptacles during start-up.
Remedy
Remedy
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