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TROUBLESHOOTING & REPAIR
FOR REPLACEMENT OF SWITCH ASSEMBLY
FIGURE F.84 - PRIMARY CURRENT SIGNAL
0 V
10V/Div | 10uS/Div |
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5.Press the MANUAL PROCEDURE ENTRY Key on the Calibration and Test Overlay and change the Power Wave to “Process 1 Setup 1
6.Turn the arc start switch ON. See Arc Start
PW450 or Figure F.79.
7.Adjust the output grid load to get 400 amps at 36VDC. The oscilloscope picture should look like Figure F.84.
*ALTERNATE TEST (without current probe)
1.Connect a transformer isolated oscilloscope as follows:
Set oscilloscope for .2v/div and 10us/div
Probe | J21 pin 1 | wire #211 |
Common | J21 pin 5 | wire #215 |
2.Observe a waveform similar to Figure F.84. Equal amplitude and symmetry of the pulses is important.
3.Check the capacitor voltages. The capacitor voltages must be within eight volts of each other.
4.Turn the arc start switch OFF. See Arc Start
PW450 or Figure F.79
5.Turn OFF the Power Wave and remove the input power. Make sure the filter capacitors are completely discharged. See Figure F.77.
PREPARE MACHINE FOR NORMAL
OPERATION.
1.Turn the power switch OFF and remove input power to the machine.
2.The input capacitors must be discharged before continuing.
3.Remove the capacitor voltage monitoring leads. See Figure F.77.
4.Remove the power input cable from CR1.
5.Remove the output cables from the Power Wave.
6.Remove the arc start switch circuit.
7.Enable the water cooler if it was enabled at the start of this test.
