Troubleshooting & repair – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual

Page 112

TEST PROCEDURE

1. Remove main input supply power to the

Power Wave 450.

2. Disconnect the Output leads from the

machine.

3. If a wire feeder is connected to the Power

Wave 450, release the drive roll tension so
the unit will not feed wire when the trigger is
activated.

4. Turn on the Power Wave 450 and activate

the gun trigger and hold for several sec-
onds. Trigger the machine on and off sev-
eral times in this manner and observe the
display. The “I=” reading should be less
than five amps when the machine is trig-
gered and NOT welding.

5. If after several trigger cycles the “I=” value

is at or above 5 amps the shunt assembly is
suspect and should be replaced.

6. If the “I=” value is below 5 amps when the

trigger is activated and not welding, the sta-
bility of the shunt assembly is at an accept-
able level.

7. To further test the shunt assembly, continue

with the output shunt/welding feedback
test.

F-52

QUICK SHUNT TEST

TROUBLESHOOTING & REPAIR

POWER WAVE 450