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F-44

F-44

TROUBLESHOOTING & REPAIR

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM

CONSTANT VOLTAGE MIG

MAXIMUM OUTPUT SETTING – NO LOAD

0 volts

50 volts

2 ms

This is the typical DC open circuit voltage waveform generated from a properly operating machine. Note that each vertical division represents 50 volts and that each horizontal divi- sion represents 2 milliseconds in time.

Note: Scope probes connected at

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

SCOPE SETTINGS

Volts/Div

50V/Div.

Horizontal Sweep

2 ms/Div.

Coupling

DC

Trigger

Internal

 

 

IDEALARC DC-655

Page 86
Image 86
Lincoln Electric DC-655 Normal Open Circuit Voltage Waveform Constant Voltage MIG, Maximum Output Setting no Load