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TROUBLESHOOTING & REPAIR
QUICK SHUNT TEST
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.
