Lincoln Electric COBRAMAX IM774 - Manual (Page 17)

CobraMAX™ Owner's Manual - Page 7
Section E Troubleshooting
Trouble Cause Remedy
No wire feed at gun,
feeder not operating, i.e., no
slave motor or brake solenoid.
115 VAC Control fuse in feeder/
Control box blown.
Replace fuse.
Micro-switch defective/not
being activated.
Replace switch. Check switch
for operation.
Broken electrical cable.
Check micro-switch wires for
continuity.
No wire feed at gun, feeder
operating properly
24 VAC Control fuse in feeder/
Control box blown.
Check motor leads for shorts;
then replace fuse.
Bad Potentiometer.
Check potentiometer with
meter.
Broken Electrical Cable
Check motor and potentiometer
for continuity.
Bad Speed control/PCB.
See specific cabinet/control
box owners manual for speed
control operation.
Wire feeds, but welding wire is
not energized.
Loose or no cable connections. Check all power connections.
Contactor control cable loose or
in wrong position
Check power supply owners
manual for location and type of
contactor signal required.
Welding power source. Check power source.
Wire feeds erratically.
Dirty or worn conduit. Blow out or replace conduit.
Wrong size contact tip. See contact tip table.
Idler roll stuck.
Check for lock washer under
idler roll, or replace if damaged.
Wire feeds one speed only.
Bad potentiometer. Check with meter.
Broken electrical cable.
Check potentiometer wires for
continuity or short.
Bad speed control.
See specific cabinet/control
owners manual for speed
control operation.
Wire walks out of the drive
rolls.
Idler roll upside-down.
Place groove in idler roll toward
top.
Rear wire guide missing. Replace wire guide.