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TROUBLESHOOTING & REPAIR
FOR REPLACEMENT OF SWITCH ASSEMBLY
FIGURE F.82 - SNUBBER SIGNAL
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5V/Div
460VAC RECONNECT
1.Reconfigure the machine for 460VAC operation.
2.Turn ON the variable AC supply applied to the primary circuit. See Figure F.76.
3.Turn on the arc start switch. See Arc Start PW450 or Figure F.79.
4.Slowly increase the voltage until filter capacitor voltage is 25VDC. NOTE: Monitor both capaci- tor voltages. If the two voltages are not within 5 to 8 VDC of each other STOP and check wiring to the FET switch board assembly and also the individual switch boards. See Figure F.77.
5.Adjust the grid load to get 5 amps output from the Power Source. DO NOT PULL MORE
THAN
6.Repeat the previous Snubber Signal Test by checking the eight test points.
OUTPUT SIGNAL TEST
1.Make certain the machine is configured for 460VAC operation.
2.Turn ON the variable AC supply applied to the primary circuit. See Figure F.76.
0 V
20uS/Div
4.Slowly increase the voltage until the filter capac- itor voltage is 25VDC. See Figure F.77.
5.Adjust the grid load to get 5 amps output from the Power Wave. DO NOT DRAW MORE
THAN
6.Set the Oscilloscope for:
5V/div.
10uS/div.
WARNING
ALL METERS AND OSCILLOSCOPES MUST BE ELECTRICALLY ISOLATED.
7.Connect the positive oscilloscope probe to the Power Wave positive welding output terminal and the negative probe to the negative welding output terminal. The output should look like the oscilloscope picture in Figure F.83.
