Lincoln Electric IDEALARC CV-300 Service Manual page 63

F-24
ABNORMAL OUTPUT WELD VOLTAGE WAVEFORM -
MACHINE LOADED ONE OUTPUT SCR NOT FUNCTIONING
This is not a typical CV output voltage
waveform. Note the "ripple" in the wave-
form. One output SCR was disconnected
to simulate an open or non-functioning out-
put SCR. Note that each vertical division
represents 20 volts and each horizontal
division represents 5 milliseconds in time.
Note: Scope probes connected at machine
high inductance output terminals.
TROUBLESHOOTING & REPAIR
20V
MACHINE LOADED TO 300 AMPS AT 32 VDC
IDEALARC CV-300
CH1
0 Volts
5ms
SCOPE SETTINGS
Volts/Div . . . . . . . . . . . . . . . . . .20 V/Div.
Horizontal Sweep . . . . . . . . . .5 ms/Div.
Coupling . . . . . . . . . . . . . . . . . . . . . .DC.
Trigger . . . . . . . . . . . . . . . . . . . .Internal.
F-24