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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR (CR1) CLEANING/REPLACEMENT (continued)
FIGURE F.18 - INPUT CONTACTOR CLEANING AND REMOVAL
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1.INPUT SUPPLY LINE
2.INPUT CONTACTOR CR1
3.RECONNECT PANEL
CLEANING PROCEDURE
1.Remove the main input supply power to the machine.
2.Locate and get access to the input contac- tor (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 re- moved.
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.
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 contac- tor (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 volt- age) 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 contac- tor 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 cor- rectly.
