CD1000 Pin Welder Instruction Manual
K.C.D. Studwelding, Cheltenham, Victoria. Tel: 03 9584 1588, Fax: 03 9584 1688
13
PROBLEM 3.
FUSE BLOWS EACH TIME WELDER IS TURNED ON.
Possible causes.
1. Shorted weld capacitors are not shorted or breaking down under
load.
2. Faulty SCR, Q3 in charging circuit.
Check that Q3 is not short-circuited.
3. Faulty Transformer.
Check that transformer has not burnt out.
PROBLEM 4.
FUSE BLOWS WHEN WELD IS MADE
.
Possible Causes
1. Faulty SCR, Q3 in charging circuit.
If Q3 is short-circuited and the AC applied to the electrolytic
capacitors did not blow the fuse; the fuse would certainly blow when
the weld was made.
2. Faulty Relay.
If contacts RLY1/1 were not opening when weld is made, fuse would
certainly blow.
PROBLEM 5.
WELDER CHARGES UP BUT WILLNOT WELD.
(Broken wires in cables cause 70% of faults)
Possible causes.
1. Relay will not energise when trigger is pressed.
(a)
Check that the chuck has not burnt out and that it is not making
contact with the weld pin / stud.
(b)
Check for faulty trigger switch.
(c)
Check D.C. output of bridge rectifier D1 to D4.
(d)
Check for faulty relay contacts RLY1/2.
(e)
Check for continuity of the gun weld cable, trigger cable and
earth cable. Breaks in either of these cables will cause the relay
not to energise.
