Troubleshooting & repair, Ac tig mode (auto - balance on) caution – Lincoln Electric SQUARE WAVE TIG 255 SVM100-A User Manual
Page 77
SQUARE WAVE TIG 255
F-36
TROUBLESHOOTING & REPAIR
0 volts
20 volts
2ms
CH1
AC TIG MODE (AUTO - BALANCE ON)
CAUTION
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
• Perform all voltage and waveform checks with high frequency circuit OFF.
_____________________________________________________________________
0 volts
20 volts
2ms
CH1
These are typical AC output voltage wave-
forms generated from a properly operating
machine. Note each vertical division repre-
sents 20 volts and each horizontal division
represents 2 milliseconds in time. The
machine was loaded with a resistance grid
bank. As the load is increased the output
waveform becomes more “square”.
Note: Scope probes connected at machine
output studs: (+) probe to electrode, (–)
probe to work.
MACHINE LOADED TO 50 AMPS AT 26VAC
MACHINE LOADED TO 200 AMPS AT 46 VAC
Volts/Div................................20 V/Div.
Horizontal Sweep .................2 ms/Div.
Coupling .........................................DC
Trigger .....................................Internal
SCOPE SETTINGS