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TROUBLESHOOTING AND REPAIR |
INPUT CONTACTOR CLEANING/REPLACEMENT PROCEDURE (continued)
FIGURE F.16 – CONTACTOR
CR 1 Contactor
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272
Coil Terminals
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120vac Here
271
W (L3) | T3 |
V (L2) | T2 |
U (L1) | T1 |
L3 | T3 |
L2 | T2 |
L1 | T1 |
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Cover Plate Screws
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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.
WARNING
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
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.
