NCD+ 1000T & 1600T Manual | Normal Operation
Part No. 729-110-038 Rev. 1.21 | May 2016 21 © 2014 Nelson Stud Welding, Inc. All Rights Reserved.
3.3 Error Codes
Only qualified personnel should perform maintenance. Some functional errors are highlighted by
appearance of an error code with the display EXX.
Abnormal presence of
voltage on studs when
there should be no voltage.
Stop using the Power Source until issue is resolved.
Measure weld terminals voltage (VDC) to confirm.
If ≥ 30VDC, check SCR Gate Leads and replace SCR.
If < 30VDC, replace Control board and Power board.
Capacitors won’t charge
(after 3 seconds, capacitors
still less than 20V)
Replace power board. If the problem is not solved, replace SCR. If
neither resolves the issue, replace the wiring harness.
Capacitors are unable to
discharge – either because
the SCR did not fire or
because the weld circuit
was broken.
1. Check weld circuit continuity.
2. Check SCR.
3. Replace Control Board.
4. Replace Power Board.
At 45°C or higher ambient
temperature
Let it cool down and reset it to 35°C.
At 45°C or lower ambient
temperature
Trip with thermal switch
mounted on heat-sink
Let it cool down. Check for loose cable connections.
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