MK Products Cobramatic Pro Series - Troubleshooting; Troubleshooting Guide

Cobramatic
®
Pro Series Owner’s Manual - Page 10
Section E Troubleshooting
Troubleshooting
Symptom
Cause
Remedy
No wire feed at gun, feeder not oper-
ating, i.e., no slave motor or brake
solenoid.
F1 & F2 fuse(s) in feeder failed.
Check AC circuit. Replace fuse(s).
F3 (4 amp) fuse in feeder failed.
Check motor leads for shorts then
replace fuse.
Micro-switch defective/not being acti-
vated. Broken electrical cable.
Replace switch. Check switch for
operation. Check micro switch wires
for continuity.
Loose board connectors. Check board connectors.
Brake solenoid inoperative. Solenoid defective. Replace solenoid.
Loose Brake Solenoid connector. Check Brake Solenoid connector.
No wire feed at gun, feeder operating
properly.
Bad potentiometer. Check potentiometer with meter.
Bad gun motor.
Check/Replace motor.
Broken electrical cable.
Check motor and potentiometer wires
for continuity.
Bad speed control/PCB. Check/Replace PC board.
Wire feeds, but welding wire is not
energized.
Loose or no power supply cable con-
nections.
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 contacts or AC.
Welding power source not working
correctly.
Check power supply for proper
operation.
Wire feeds erratically.
Dirty or worn conduit.
Blow out or replace conduit.
Incorrect pressure on drive rolls. Adjust pressure at gun (Gold or Prince)
Idler roll stuck in gun. 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 continu-
ity or shorts.
Bad speed control.
Check/Replace PC boards.
Wire walks out of drive rolls. Idler roll upside-down. Place groove in idler roll toward the
top.
Rear wire guide missing.
Replace wire guide.
Trigger inoperable or not operating
correctly.
Trigger mode configuration.
Check front panel Trigger Normal/
Latched toggle switch.
Purge not operating correctly. Jumper incorrectly configured. Gas
solenoid malfunctioning.
Check jumper location per Jumper
Table in Appendix. Check cable con-
nections to gas solenoid Check valve
in gun.
No PosaStart Wire Speed Transition
Welding power cable and/or gun power
cable connected to wrong bolt on
power block.
Welding power cable to bottom bolt.
Gun power cable to top bolt.
Welding current not being sensed.
Check current sensor in power block.
Remote Functions Not Working Wires not connected at TB1 Reseat all wire connections at TB1.