K1587-1 Cobramatic® Owner's Manual -
Page 17
TROUBLESHOOTING
TROUBLE CAUSE REMEDY
No wire feed at torch, feeder
not operating, i.e., no slave
motor or brake soleniod.
F2 & F3 (MDA7 7A Slow Blow)
fuse in feeder blown.
Check AC circuit. Replace fuse
F1 (4 amp) fuse in feeder blown. Check motor leads for shorts, then
replace fuse
Micro-switch defective/not being
activated. Broken electrical cable.
Replace switch. Check switch for
operation. Check micro switch wires for
continuity.
Relay K2 inoperative. Check/Replace relay K2.
Loose J2, J3, P.C. board
connector
Check J2, J3 connectors.
Brake soleniod inoperative.
Soleniod defective. Replace soleniod.
Relay K2 inoperative. Check for 42VAC across J4-1 and J4-2
Check relay K2 for AC not present.
No wire feed at torch, feeder
operating properly.
Bad potentiometer. Check potentiometer with meter.
Bad torch motor. Check/Replace motor.
Broken electrical cable. Check motor and potentiometer wires
for continuity.
Bad speed control/PCB. Check/Replace P.C. Board.
Wire feeds, but welding wire
is not energized.
Loose or no cable connections. Check all power connections.
Relay K2 not sending contactor
signal.
Check/Replace relay K2.
Contactor control cable loose or in
wrong position.
Check power supply owners manual for
location and type of contactor signal
required, i.e. closing contacts or AC.
Welding power source not working
right.
Check power supply for proper
operation.
Wire feeds erratically.
Excessive spool drag pressure. Decrease spool drag pressure inside
hub.
Dirty or worn conduit. Blow out or replace conduit.
Incorrect pressure on drive rolls. Adjust pressure at both feeder and
torch.
Idler roll stuck. Check for lock washer under idler roll, or
replace if damaged or worn.
Wrong size contact tip. See contact tip table.
Wire feeds one speed only
Bad potentiometer. Check with meter.
Broken electrical cable in lead
assy.
Check potentiometer wires for continuity
or shorts.
Bad speed control. Check/Replace P.C. Board.
Wire walks out of drive rolls
Idler roll upside-down. Place groove in idler roll towards top.
Rear wire guide missing. Replace wire guide.
