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F-32

TROUBLESHOOTING & REPAIR

F-32

TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED

0 VOLTS

20.0 V

5 ms

 

MACHINE LOADED TO 250 AMPS AT 26 VDC

 

 

SCOPE SETTINGS

 

 

 

 

This is a typical DC output voltage waveform

 

 

generated from a properly operating

Volts/Div

20 V/Div

machine. Note that each vertical division

 

 

represents 20 volts and that each horizontal

Horizontal Sweep

5 ms/Div

division represents 5 milliseconds in time.

 

 

The machine was loaded with a resistance

Coupling

. . . . DC

grid bank.

 

 

NOTE: Scope probes connected at machine

Trigger

. Internal

 

 

output terminals: (+) probe to electrode, (-)

 

 

probe to work.

 

 

 

 

 

POWER MIG 255

Page 70
Image 70
Lincoln Electric SVM144-B service manual Typical Output Voltage Waveform Machine Loaded