Lincoln Electric SVM123-A service manual Troubleshooting & Repair

Models: SVM123-A

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F-42

TROUBLESHOOTING & REPAIR

F-42

 

 

TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE

LOADED - 500 AMP OUTPUT TERMINAL

CONSTANT VOLTAGE INNERSHIELD MODE

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This is the typical DC open circuit volt- age waveform generated from a proper- ly operating machine. Note that each vertical division represents 20 volts and that each horizontal division represents 2 milliseconds in time. The machine was loaded with a resistance grid bank. The grid bank meters read 400 amps at 36 VDC.

Note: Scope probes connected at

machine ouput terminals: (+) probe to positive 500 amp terminal, (-) probe to negative terminal.

SCOPE SETTINGS

Volts/Div. . . . . . . . . . . . . 20 V/Div. Horizontal Sweep . . . . . 2 ms/Div. Coupling . . . . . . . . . . . . . . . . . DC Trigger . . . . . . . . . . . . . . . Internal

IDEALARC DC-1000

Page 82
Image 82
Lincoln Electric SVM123-A service manual Troubleshooting & Repair