MK Products Cobra MX Gun - ACWC - Manual (Page 16)

Cobra ® MX Owner's Manual - Page 8
Section E Troubleshooting
Trouble Cause Remedy
No wire feed at
gun, feeder not
operating, i.e. no
slave motor or
brake solenoid.
Input power 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.
Motor 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 wires for
continuity.
Bad speed control/PCB.
See specific cabinet/
control box owner's
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
owner's manual for
location and type of
contactor signal required,
i.e. closing or 115VAC.
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 owner's manual for
speed control operation.
Wire walks out of
drive rolls.
Idler roll upside-down
Place groove in idler roll
toward top.
Rear wire guide missing Replace wire guide.