Troubleshooting & repair, Control board test, Warning – Lincoln Electric IDEALARC DC 1000 SVM123-A User Manual
Page 66
F-26
TROUBLESHOOTING & REPAIR
F-26
TEST PROCEDURE FOR
NORMAL CONTROL BOARD
OPERATION
1.
Remove main supply power to the
DC-1000.
2.
Remove screws, loosen and lower
the Front Panel to access and
inspect the Control Board located
in the right front control box. See
Figure F.9.
3.
Apply the correct three-phase input
power to the DC-1000. Turn on the
machine.
4.
Connect a jumper wire from termi-
nal #2 to terminal #4 on the termi-
nal strip. These can be accessed
through the front panel assembly
door. See Figure F.7.
5.
LED 1 should be lit indicating the
presence of 115 VAC at leads
#255 to #256 Plug J1.
6.
LED 3 should be lit indicating
power is being applied to the fault
protection relay (2CR).
7.
LED 4 should NOT be lit. LED 4
should light only if there is a “fault”
condition.
8.
LED 2 should be lit indicating output
voltage feedback is being supplied
to the Control Board. With the
Output Control Switch (SW3) in the
“Output Control At DC-1000”
(Panel) position and the Welding
Mode Switch (SW4) in a CV posi-
tion, LED 2 should change in bright-
ness as the Output Control
Potentiometer is rotated. As the
open circuit voltage is increased,
LED 2 should get brighter and vice
versa.
9.
LED 5 indicates a control signal
(lead #231) is being supplied to the
firing circuit. As the output is varied,
LED 5 should change in brilliancy
from bright (at low output) to dim (at
high output). When the Weld Mode
Switch (SW4) is in the CC (Stick)
position, the open circuit voltage is
at maximum, and LED 5 will be very
dim or not lit.
CONTROL BOARD TEST
IDEALARC DC-1000
FIGURE F.9 Control Board LED and Pin Locations.
WARNING
JUMPERING LEADS 2 AND 4 ELEC-
TRICALLY ENERGIZES MACHINE’S
OUTPUT TERMINALS. DO NOT
TOUCH ELECTRICALLY HOT COM-
PONENTS.
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