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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR (CR1) CLEANING/REPLACEMENT (continued)
FIGURE F.17 – INPUT CONTACTOR CLEANING AND REMOVAL
1.INPUT SUPPLY LINE
2.INPUT CONTACTOR CR1
3.RECONNECT PANEL
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CLEANING PROCEDURE
1.Remove the main input supply power to the machine and remove the input access panel.
2.Locate and get access to the input contac- tor (CR1) in the input box. See Figure F.17.
3.Remove the input contactor cover plate using a phillips head screwdriver.
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.17.
3.Disconnect the main input supply power leads L1, L2, and L3 to the input contactor.
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WARNING |
| Remove the control transformer primary |
Do not apply input power to | leads H1, H2 or H3 (dependent on input volt- | |
age) from L1 and L3 terminals on the input | ||
the machine with the input | side of the contactor. | |
contactor cover plate re- | 4. | Using the 7/16” socket wrench, disconnect | ||
moved. | ||||
| the output leads T1, T2, and T3 from the | |||
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| input contactor. (Label the leads.) | ||
| 5. | Identify and label the leads connected to the | ||
4. Blow out any dirt or dust in or around the |
| input contactor coil. | See the Wiring | |
| Diagram. |
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contacts with a low pressure air stream. |
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5. Inspect the contacts for signs of excessive | 6. | Disconnect the leads from the input contac- | ||
| tor coil (leads X1, #232 and #233). See the | |||
wear, pitting, or contacts fused (stuck) |
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| Wiring Diagram. |
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together. |
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a. If any of these conditions are present, | 7. | Remove the three | ||
| screws using a 5/16” socket wrench. See | |||
replace the input contactor assembly. |
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| Figure F.17. |
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6. Replace the input contactor cover plate. |
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8. | Remove the input contactor. | |||
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| 9. | Insert the replacement input contactor and | ||
install it following the procedures in reverse order.
NOTE: Be sure to reconnect all leads correctly.
