Lincoln Electric SVM 122-A service manual Troubleshooting & Repair

Models: SVM 122-A

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F-36

F-36

TROUBLESHOOTING & REPAIR

TYPICAL OUTPUT VOLTAGE WAVEFORM – MACHINE LOADED

CONSTANT VOLTAGE FCAW/GMAW MODE

CH1

0 volts

20 volts

5 ms

This is the typical DC open circuit voltage waveform generated from a properly operating machine. Note that each vertical division represents 20 volts and that each horizontal divi- sion represents 5 milliseconds in time. The machine was loaded with a resistance grid bank. The DC-400 meters read 400 amps at 36 VDC.

Note: Scope probes connected at

machine output terminals: (+) probe to positive terminal, (-) probe to neg- ative terminal.

SCOPE SETTINGS

Volts/Div

20V/Div.

Horizontal Sweep

5 ms/Div.

Coupling

DC

Trigger

Internal

 

 

IDEALARC DC-400

LINCOLN ®

ELECTRIC

Page 80
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Lincoln Electric SVM 122-A service manual Troubleshooting & Repair