ESAB Migmaster 300i cvcc Service And Maintenance Manual page 37

WELD CONDITION
10. Shield gas flow low or
stopped.
11. Wire stubs on work
while welding.
12. Wire burns back into
contact tip.
13. Wire does not feed;
motor running (drive
roll turns).
14. Wire does not feed;
motor NOT running
(drive roll does not turn).
15. Wire feed does not stop.
16. Gas continues to flow
after trigger release.
TROUBLESHOOTING GUIDE - (Cont)
POSSIBLE CAUSE
a. Cylinder valve closed.
b. Cylinder empty.
c. Faulty regulator or adaptor.
d. Faulty gas solenoid valve.
a. Controls not set properly for
metal gauge, thickness.
a. Contact tip loose.
b. Tip too close to work.
c. Wire feed slipping.
d. Contact tip damaged.
e. Voltage setting too high.
f. Drive or pressure roll dirty or
worn.
a. Kink, etc. in wire, or wire bound
on reel.
b. Wire freezing to contact tip
(burnback).
c. Clogged liner.
a. Motor.
b. Power switch S1 and CB1.
c. Defective PCB1.
a. Torch trigger switch.
b. PCB1.
a. Gas solenoid valve stuck open.
37
REMEDY
a. Turn off regulator, slowly open
valve, until regulator reaches
35 c.f.h. pressure.
b. Replace if gauge so indicates.
c. Check flow at outlet; replace
faulty item.
d. Replace solenoid valve.
a. Reset controls properly.
a. Firmly tighten with pliers.
b. Maintain 1/4" (.6 cm) wire
protrusion; hold torch further
from work.
c. Increase pressure on pressure
roll by adjusting pressure knob.
d. Trim back tip 1/16" (1.6 cm) max.
Replace if still faulty.
e. Adjust setting.
f. Clean rolls or replace.
a. Straighten; or feed wire until
clear and cut off.
b. Free freeze, or remove contact
tip feed wire until clear cut end
free, and replace tip.
c. Replace liner.
a. With wire speed dial on 10,
press trigger. If voltage
appears across motor leads
but motor does not run, check
motor gears and commutator
areas.
b. With S1 ON, if voltage across
terminal 1 and 3 is 24 V ac,
switch and fuses are good.
c. Check board voltages
(Para. 7.1.1).
a. Check continuity of torch trigger
circuit; check to see if trigger
lever is stuck in "ON" position.
b. Check for proper action.
a. Tap solenoid or click on and off
to clear valve.