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L3 T3
L2 T2
L1 T1
W
(L3)
T3
U
(L1)
V
T2
(L2)
T1
CR 1 Contactor
Coil Terminals
Apply External
120vac Here
272
271
Cover Plate Screws
FIGURE F.16 – CONTACTOR
INPUT CONTACTOR CLEANING/REPLACEMENT PROCEDURE (continued)
TROUBLESHOOTING AND REPAIR
F-40 F-40
DC-600
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CLEANING PROCEDURE
1. Remove the main input supply power to the
machine.
2. Locate and get access to the input contactor (CR1)
in the input box. See Figure F.18.
3. Remove the input contactor cover plate using a
phillips head screwdriver.
Do not apply input power to the
machine with the input contactor
cover plate removed.
4. Blow out any dirt or dust in or around the contacts
with a low pressure air stream.
5. Inspect the contacts for signs of excessive wear,
pitting, or contacts fused (stuck) together.
a. If any of these conditions are present, replace
the input contactor assembly.
NOTE: Lincoln does not supply contactor parts. They
may be available through the manufacturer.
6. Replace the input contactor cover plate.
CONTACTOR REPLACEMENT
PROCEDURE
1. Disconnect main input supply power to the
machine.
2. Locate and get access to the input contactor (CR1)
in the input box. See Figure F.18.
3. Disconnect the main input supply power leads L1,
L2, and L3 to the input contactor.
Remove the control transformer primary leads H1,
H2 or H3 (dependent on input voltage) from the L1
and L3 terminals on the input side of the contactor.
4. Disconnect the output leads T1, T2, and T3 from
the input contactor.
5. Identify and label the leads connected to the input
contactor coil. See the Wiring Diagram.
6. Disconnect the leads from the input contactor coil
(leads X1, #256 and #255A). See the Wiring
Diagram.
7. Remove the three self-tapping mounting screws
using a 5/16” socket wrench.
8. Remove the input contactor.
9. Insert the replacement input contactor and install it
following the procedures in reverse order.
NOTE: Be sure to reconnect all leads correctly.
WARNING