Lincoln Electric POWER MIG SVM167-A - Manual (Page 61)

TROUBLESHOOTING AND REPAIR F-25 F-25
POWER MIG® 215
ABNORMAL OUTPUT VOLTAGE WAVEFORM - MACHINE
LOADED (MAX TAP “G”)
ONE OUTPUT DIODE NOT FUNCTIONING
20.0 V 5 ms
0 Volts
This is NOT a typical DC output voltage
waveform. One output diode is not func-
tioning. Note the increased ripple con-
tent. One diode was disconnected to
simulate an open or non-functioning out-
put diode. Each vertical division repre-
sents 20 volts and each horizontal divi-
sion represents 5 milliseconds in time.
The machine was loaded with a resis-
tance grid bank.
NOTE: Scope probes connected at
machine output terminals: (+)
probe to electrode, (-) probe to
work.
Volts/Div.................................20V/Div
Horizontal Sweep.................5 ms/Div
Coupling........................................DC
Trigger....................................Internal
SCOPE SETTINGS
MACHINE LOADED TO 180 AMPS AT 16 VDC
Return
to
Section
T
OC
Return
to
Section
T
OC
Return
to
Section
T
OC
Return
to
Section
T
OC
Return
to
Master
T
OC
Return
to
Master
T
OC
Return
to
Master
T
OC
Return
to
Master
T
OC