Tweco 130i Transarc Service Manual - Manual (Page 56)

TROUBLESHOOTING 6-14 Manual 0-5282
TRANSARC 130i
6.12 Calibration
1 Calibration
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While the power source is turned off, set SW1 position 2 to OFF, to allow calibration of output volts & amps.
2 Output Current Calibration
Select STICK mode on the front panel.
Connect a load to the output terminals. The load should be of a resistance to give between 20V – 25V at 130A.
Set front panel AMPS control to minimum.
Adjust Imin trimpot until output amps is 5A +/- 0.5A
Set front panel AMPS control to maximum.
Adjust Imax trimpot until output amps is 130A +/- 1A
Recheck settings
Set front panel AMPS control to maximum.
Adjust A potentiometer so Amps display reads within 0.5A of the measured value.
Press the front panel AMPS control for > 2 seconds, so that the meter displays weld volts.
Disconnect the load from the output terminals
Measure output welding voltage and adjust WVF potentiometer so Volts display reads within 0.1V of the measured
value.
Press the front panel AMPS control for > 2 seconds, so that the meter display weld amps.
Turn off the mains power off to the machine.
Set SW1-2 back to the ON position.
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