ESAB Migmaster 275 Instruction Manual page 39

sectIon 5
5.3.3 solenoID ValVe replaceMent
When replacing the gas solenoid valve, the inlet (with the
word IN) must face the rear of the Unit.
Many troubleshooting situations require that the power
remain on and that power terminals in the equipment
carry voltage. exercise extreme caution when working
on "lIVe" equipment. avoid contact with electrical
components, except when testing with an appropriate
instrument.
Do not make any repairs to equipment unless you are
fully qualified, as described in the maintenance sec-
tion.
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
taBle 5.1 trouBleshootIng guIDe
possIBle cause
a. Primary input power not available.
b. Faulty connection, primary input
cable, or power switch (S3)
c. Blown line fuse.
a. Thermostat has opened.
b. Shorted diode in main rectifier.
c. Open in wiring
a. See Weld Condition 1.
b. Malfunctioning fan motor (M1)
a. Poor workpiece connection.
b. Loose welding connections.
c. Wrong polarity.
a. Low line Voltage and / or current
too low.
39
reMeDY
a. Check for Voltage at primary input.
b. Repair or replace cable or switch
(TGS1) 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 repre-
sentative.
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.
serVIce