Figure F.84 Primary Current Signal | Lincoln Electric SVM112-B

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F-208

PRE-POWERUP SWITCH BOARD TEST PROCEDURE

FOR REPLACEMENT OF SWITCH ASSEMBLY G2402-2 (continued)

FIGURE F.84 - PRIMARY CURRENT SIGNAL

0 V

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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 -8” mode.

6.Turn the arc start switch ON. See Arc Start

7.Adjust the output grid load to get 400 amps at 36VDC. The oscilloscope picture should look like Figure F.84.

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

5.Turn OFF the Power Wave and remove the input power. Make sure the filter capacitors are completely discharged. See Figure F.77.

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.