Reverse Single Phase Motor - Re-wire

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12th October 2020, 02:51 PM
Charlie_6ft

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Reverse Single Phase Motor - Re-wire

I went to connect up a motor (run of the mill Chinese 3HP motor) to a saw I am restoring on the weekend. (Can read about it here: https://www.woodworkforums.com/f299/...n-table-235202). The motor comes with a Double Pole Single Phase Safety Switch (KJD178 IP55). This is pretty handy but incorporates a little bit of complexity as it has two leads running to the motor.
1) The power source
2) The actual ON/OFF switch

When I did a test run I realised the motor is spinning clockwise. On any other motor I've had it's had a terminal box and you can just switch around bridging to re-configure it per instructions on the motor. On this motor it doesn't have a terminal box OR instructions. I assume it can be reversed (can't be more than about 10yr old motor). From the drawing I've done up is someone able to advise what config needs to change to make it go anti-clockwise?

Attachment 482661
12th October 2020, 03:17 PM
BobL

Reversing an SP motor requires reversal of EITHER the main/run coil leads OR start coil leads. On your motor it appears this cannot be achieved outside the motor and the motor has to be opened up, the relevant connections broken and remade. This is not a task for most DIYers - suggest you take it to a motor reminders.
12th October 2020, 05:12 PM
ubeaut

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12th October 2020, 08:43 PM
Charlie_6ft

Thanks Bob, I think I'll keep this motor for one of the bandsaws I am restoring and buy a new one - simple way out and cost effective :;:;
14th October 2020, 06:51 PM
Sterob

Quote:

Originally Posted by BobL

Reversing an SP motor requires reversal of EITHER the main/run coil leads OR start coil leads. On your motor it appears this cannot be achieved outside the motor and the motor has to be opened up, the relevant connections broken and remade. This is not a task for most DIYers - suggest you take it to a motor reminders.

What Bob said....