Troubleshooting - Miller RAD-400EF Owner's Manual

6-3. Troubleshooting

Trouble
Electrode wire feeding stops or feeds
erratically during welding.
Motor runs slowly.
Motor runs at full speed regardless of
wire speed setting.
Motor runs in reverse direction.
Notes
OM-256907 Page 20
Readjust hub tension and drive roll pressure.
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.
See applicable controller Owner's Manual for changing motor direction and correct wiring instructions.
Remedy