WTC Technitron T2050 - Troubleshooting AVC;CC Issues; Faults: Low Current and Stepper End

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Things to check are
• Is the tap on the weld transformer set to deliver a requested
AVC current and make good welds, at mid range of the
percent of available current (40 – 80%)? The control must
have room to make corrections. The closer the control is
programmed to the limits, the more likely the faults will
occur. Adjust the tap or change the secondary’s impedance so
that good welds are made at mid-range.
• If the control is in AVC mode, is the AVC set point near the
actual line voltage? Temporarily disable AVC by entering 0.
If turning off AVC corrects the problem and Step 1 is true,
then re-calibrate the line voltage.
• If the control is in Constant Current mode, place it in AVC
mode. Make sure Step 1 is satisfied. Then make sure the
control can read current to your satisfaction. Know what the
transformer turns ratio is and enter it correctly. If everything
is correct, when SW1–6 is open, the display should match the
reading on a secondary current meter. Return the control to
Constant Current mode.
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This denotes that the Low Current Limit has been exceeded.
When this fault occurs, the actual current value will flash on the
numeric display. The value displayed will be lower then the
value programmed in Configuration Items, Cur. low limit.
CD5@@5B5>4 This indicates that one of the four stepper programs has ended.
When this fault occurs, the numeric display will display "S_1,"
"S_2," "S_3" or "S_4" to indicate which stepper has ended. To
reset the stepper program, place the control in Program mode
and press the FAULT/STEPPER RESET button. This resets ALL
four Stepper programs. If not using steppers, program 0 in both
Stepper Count 1 and 2.