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TROUBLESHOOTING & REPAIR
ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM
HIGH IDLE – NO LOAD – OUTPUT CONTROL AT MAXIMUM
CH1
0 volts
50 volts | 5 ms |
This is not the typical DC output voltage waveform. Note the “gap” in the waveform. One output diode was disconnected to simulate an “open” diode. Each vertical division repre- sents 50 volts and that each horizon- tal division represents 5 milliseconds in time.
Note: Scope probes connected at machine output terminals.
SCOPE SETTINGS
Volts/Div | 50V/Div. |
Horizontal Sweep | 5 ms/Div. |
Coupling | DC |
Trigger | Internal |
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WELDANPOWER 125
