Troubleshooting; Section 4 - Electrical Diagram - Miller RAD-400 Manuel D'utilisation

3-3. Troubleshooting

Trouble
Electrode wire feeding stops or feeds er- Readjust hub tension and drive roll pressure.
ratically during welding.
Motor runs slowly.
Motor runs at full speed regardless of
wire speed setting.
SECTION 4 – ELECTRICAL DIAGRAM
Change to correct size drive roll.
Clean or replace dirty or worn drive roll.
Check and replace incorrect size or worn wire guides.
Replace contact tip or liner. See gun/torch Owner's Manual.
Remove weld spatter or foreign matter from around gun/torch nozzle opening.
Check and secure motor plug connection; check brushes.
Have Factory Authorized Service Agent check drive motor.
Reduce load. Decrease hub brake tension or drive roll tension.
Check for correct input voltage.
Check weld control unit for proper operation.
Figure 4-1. Circuit Diagram
Remedy
SA-192 940
OM-1598 Page 17