MK Products Cobra System III Gooseneck - Manual (Page 20)

TROUBLESHOOTING GUIDE
TROUBLE CAUSE REMEDY
No wire feed at torch, feeder
not operating, i.e. no slave
motor or brake solenoid. 115 VAC Control fuse in
feeder/Control box blown.
Micro-switch defective/not being
activated.
Broken electrical cable.
Replace fuse.
Replace switch. Check switch for
operation
Check micro-switch wires for
continuity.
No wire feed at torch, feeder
operating properly 24 VAC Control fuse in
feeder/Control box blown.
Bad Potentiometer.
Broken Electrical Cable.
Bad Speed control/PCB.
Check motor leads for shorts;
then replace fuse.
Check potentiometer with meter
Check motor and potentiometer wires
for continuity.
See specific cabinet/control box
owners manual for speed control
operation.
Wire feeds, but welding wire
is not energized. Loose or no cable connections.
Contactor control cable loose or in
wrong position.
Welding power source.
Check all power connections.
Check power supply owners manual
for location and type of contactor
signal required, i.e., closing or 115
VAC.
Check power source.
Wire feeds erratically. Excessive spool drag pressure.
Dirty or worn conduit.
Incorrect pressure on drive rolls.
Idler roll stuck.
Wrong size contact tip.
Decrease spool drag pressure.
Blow out or replace conduit.
Adjust pressure at both feeder and
torch.
Check for lock washer under idler
roll, or replace if damaged.
See Contact tip table.
Wire feeds one speed only. Bad potentiometer.
Broken electrical cable.
Bad speed control.
Check with meter.
Check potentiometer wires for
continuity or short.
See specific cabinet/control owners
manual for speed control operation.
Wire walks out of drive rolls. Idler roll upside-down.
Rear wire guide missing.
Place groove in idler roll toward top.
Replace wire guide
trouble.tbl
Cobra Gooseneck Owner's Manual - 8/96 Page 15