Troubleshooting - Miller Auto Deltaweld 452 Owner's Manual

4-12. Troubleshooting

Trouble
No weld output; unit completely
inoperative.
No weld output; Power switch pilot light
on; fan on; meter display On.
Unit provides only maximum or mini-
mum weld output.
Erratic or improper weld output.
Fan not operating. Note: fan runs only
when cooling is necessary.
Place line disconnect switch in On position (see Section 2-11).
Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 2-11)).
Check for proper input power connections (see Section 2-11).
Check fuse F1, and replace if necessary (see Section 4-3).
Check for proper jumper link position (see Section 2-11).
Check, repair, or replace remote control.
Unit overheated. Allow unit to cool with fan On (see Section 2-2).
Check voltmeter/ammeter Help displays.
Unit overheated. Allow unit to cool with fan On (see Section 2-2).
Have Factory Authorized Service Agent check control board PC1.
Have Factory Authorized Service Agent check control board PC1.
Use proper size and type of weld cable (see Section 2-9).
Clean and tighten all weld connections.
Have Factory Authorized Service Agent check control board PC1 and/or SCR in main rectifier.
Check for and remove anything blocking fan movement.
Have Factory Authorized Service Agent check fan motor.
Remedy
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