IDEALARC DC-600
F-32
TROUBLESHOOTING & REPAIR
If LED 3 Does Not Glow But LED 1
Does Glow When ON PUSH
BUTTON Is Pushed
NOTE: When this condition occurs, the
Fault Protection Relay (CR2) is not
receiving the 24 VDC supply voltage.
Therefore, the Input Contactor (CR1)
cannot close. Perform the following:
1.
Set and hold in the ON position the
ON/OFF PUSH BUTTON.
a.
If LED 4 glows or flickers,
• Check the Weld Output
Terminals and associated
wiring for a "short" condition.
See wiring diagram.
• Check the Remote Control
Circuit (leads #75, #76, #77).
They may be shorted to the
negative welding voltage. See
wiring diagram.
b.
If the above procedures do not
uncover the problem, the
Control Board may be faulty.
Replace.
If LED 5 Does Not Glow and Vary in
Brightness Under the Following
Conditions
Machine is operating under load (or ter-
minals #2 and #4 are jumpered togeth-
er on the terminal strip).
The OUTPUT CONTROL POTEN-
TIOMETER is rotated.
The WELD MODE SWITCH is in either
CV position.
The OUTPUT CONTROL SWITCH is in
the "Output Control at DC-600" posi-
tion.
1.
Check the OUTPUT CONTROL
POTENTIOMETER and associated
wiring for loose or faulty connec-
tions.
a.
If all the above conditions are
met, the Control Board may be
faulty. Replace.
CONTROL BOARD TEST
b.
If the open circuit voltage is not
present at the Control Board,
then check leads #222 and
#215 for loose or faulty wiring
connections. See wiring dia-
gram.
5.
Test for continuity (zero ohms)
between the negative output termi-
nal and lead #222 at Plug J1 on the
Control Board.
a.
If more than zero ohms is mea-
sured, the lead may be faulty.
6.
Test for continuity (zero ohms)
between the positive output termi-
nal and lead #215 at Plug J3 on the
Control Board.
a.
If more than zero ohms is mea-
sured, the lead may be faulty.
NOTE: If previous tests do not reveal
the problem then the Control Board
may be faulty. Replace.