User Manual

SERVICE 4 - 26 Manual 0-2529
TROUBLE POSSIBLE CAUSE REMEDY
P. Pilot arc on, no main arc
transfer (torch brought
within range of work)
Q. Main arc starts but goes
out immediately and
main contactor (W1 or
W2) goes off
1. Work cable not connected
2. Defective current control
pot (on front panel or
remote)
1. Fault condition causes
output greater than 175
amps
1. Connect work cable
securely
2. If remote is in use, discon-
nect J15 and set current at
front panel. If transfer is
okay, replace remote. If
remote is not in use, see
Test M (page 4-35)
1. Shorted Q1 or faulty
switching control PC
board. See test K (page
4-33)