Voltmeter/Ammeter Error Displays; Troubleshooting - Miller Big Blue Duo Pro 700 X Owner's Manual

8-9.

Voltmeter/Ammeter Error Displays

Use the Voltmeter/Ammeter error displays to diagnose and correct fault conditions.
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When an error is displayed, normally weld output has stopped but generator power output may be okay.
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To reset error displays, stop unit and then restart. See below to reset CHEK REMT display.
Error Display
CHEK REMT Indicates a remote device connected to the Remote Receptacle may be faulty. Clear fault by stopping and restarting the
unit, or by turning Process/Contactor switch to another position. If problem continues, have Factory Authorized Service
agent check the remote device and main control board PC1.
IGBT 1SHT Indicates the thermistor in IGBT module 1 has shorted. Have Factory Authorized Service Agent check unit.
IGBT 1OPN Indicates the thermistor in IGBT module 1 is open. Have Factory Authorized Service Agent check unit.
IGBT 2SHT Indicates the thermistor in IGBT module 2 has shorted. Have Factory Authorized Service Agent check unit.
IGBT 2OPN Indicates the thermistor in IGBT module 2 is open. Have Factory Authorized Service Agent check unit.
IGBT TEMP Indicates an IGBT module has overheated. If this display is shown, check generator cooling system and/or reduce duty
cycle. Keep engine access door closed when running unit to maintain proper cooling airflow past module. Allow unit to
cool before restarting. If problem continues, have Factory Authorized Service Agent check unit.
MAX POWR Engine power limit exceeded, causing weld output to be temporarily reduced. Error clears after 5 seconds.
S/W ERR Software version mismatch occurred. Reload software update. If error does not clear, have Factory Authorized Service
Agent check unit.
S/W BLD Software build mismatch occurred. Reload software update. If error does not clear, have Factory Authorized Service
Agent check unit.
BOOT ERR Slave processor(s) not reporting versions. Reload software.

8-10. Troubleshooting

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Also see Voltmeter/Ammeter help displays to assist in troubleshooting weld problems (see Section 8-9).
A. Welding
Trouble
No weld output; generator power out-
put okay at AC receptacles.
No weld output or generator power
output at AC receptacles.
Erratic weld output.
High weld output.
Low weld output.
Place Process/Contactor switch in an Output On position, or place switch in a Remote On/Off Re-
quired position and connect remote contactor to Remote receptacle (see Section 5-9).
Reset supplementary protector CB9 and/or CB29 (see Section 8-8). Check for faulty remote device
connected to Remote receptacle.
Check and secure connections to Remote receptacle (see Section 5-9).
Check fuse F2, and replace if open (see Section 8-8). Have Factory Authorized Service Agent check
brushes and slip rings, weld excitation circuit, and the rotor.
Disconnect equipment from generator power receptacles during start-up.
Reset supplementary protector CB4.
Check fuses F1 and F2, and replace if open (see Section 8-8). Have Factory Authorized Service
Agent check integrated rectifier SR2, capacitor C6, and the rotor.
Have Factory Authorized Service Agent check brushes and slip rings, 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.
Check position of Voltage/Amperage Adjust control.
Check engine speed, and adjust if necessary.
Have Factory Authorized Service Agent check voltage feedback circuit.
Check position of Voltage/Amperage Adjust control.
Display Example
Description
Remedy
OM-282302 Page 61