- Joined
- May 4, 2019
- Messages
- 792
If the motor just humms you have power to the run windings but the capacitor is not connected. Look for a loose or disconnected wire on th forward relay. Also a bad relay is a possibility.
Contactors are worth doing an occasional bit of preventive maintenance; have you tried cleaningOk, Mark thanks for diagrams. I was able to determine which wire to exchange on contactor so the the momentary (jog) switch activated it.
It confirmed the one on left isbad.
I have ordered 2 contactors,
Thanks.. good inputIf the motor just humms you have power to the run windings but the capacitor is not connected. Look for a loose or disconnected wire on th forward relay. Also a bad relay is a possibility.
Thanks, good idea, but unable to locate where that is possible. Seems to be sealed within the contactorContactors are worth doing an occasional bit of preventive maintenance; have you tried cleaning
and burnishing the contacts? Sometimes just dragging a dollar bill between the buttons
fixes it right up. On fancy relays, use a twenty...
Thanks for clarification. The current contactor is 110 v, 110 coil, 4 pole and 4 auxillary with 2nc and 2 no and 110v to transformer. Do you think the teco cua-422You can get contactors in about any configuration and coil voltage, there are lots of 110V contactors that could be used, as well as auxiliary switch blocks. You just need to match up the switch configuration, you can always go to a higher Hp rated contactor. Motor is single phase, so there is no reasonable VFD option w/o replacing the motor. VFD's do eliminate the contactors and require a direct motor connection, but then there are control issues with proper wiring the low voltage inputs for safety reasons.