Troubleshooting Guide - ESAB Migmaster 300i cvcc Service And Maintenance Manual

WELD CONDITION
1. No weld or control power.
2. No welding power.
3. Fan does not run.
4. Erratic welding current.
5. Welding output voltage
and/or current too low.
6. Stringy irregular bead,
poor penetration.
7. Bead not centered.
8. Bead too large.
9. Unstable arc, excess
spatter, weld porous.

TROUBLESHOOTING GUIDE

POSSIBLE CAUSE
a. Primary input power not available.
b. Faulty connection, primary input
cable, or power switch (S1).
c. Blown line fuse.
a. Thermostat has opened.
b. Shorted diode in rectifier module.
c. Open in wiring.
a. See Weld Condition 1.
b. Defective fan motor (M1).
a. Poor workpiece connection.
b. Loose welding connections.
c. Wrong polarity.
a. Low line voltage.
b. Welding cables too long or too
small.
c. Loose connection.
d. Defective capacitor bank.
a. Torch moved too fast.
b. Controls are not set properly for
metal gauge thickness.
c. Wrong polarity.
a. Nozzle not aligned.
a. Torch moved too slowly.
a. Incorrectly set controls.
b. Shield gas flow is too low or
stopped.
c. Torch nozzle is too far from work.
d. Faulty regulator or adapter.
e. Faulty gas solenoid valve (SOL1).
f. Wrong polarity.
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REMEDY
a. Check for voltage at primary input.
b. Repair or replace cable or switch
(S1) as necessary).
c. Replace fuse. If it blows again,
contact ESAB representative.
a. Wait 15 minutes with fan running.
If still no power, contact ESAB
representative.
b. Check diodes and replace if req'd.
c. Check all wiring.
a. Repair or replace cable or
switch as necessary.
b. Replace fan motor (M1).
a. Check workpiece grounding
connection.
b. Check all connections.
c. Check for correct polarity.
a. Use correct voltage.
b. Use correct cable size.
c. Check all welding cable
connections.
d. Check capacitors for low
leakage resistance.
a. Move torch slower along seams.
b. Reset control properly.
c. Check for correct polarity.
a. Move torch nozzle parallel to
and centered over seam.
a. Move torch faster along seam.
a. Reset controls.
b. See Condition 10.
c. Maintain 1/4" (.6 cm) wire
protrusion; hold closer to work.
d. Check flow at outlet;
replace faulty item.
e. Replace solenoid valve.
f. Check polarity.