OT- wiring electric motor?

TimWafer · Jan 6, 2011

OK, I need to replace a reversing 110-volt motor on a piece of antique equipment. I’ve acquired a new motor but am getting a headache tiring to figure out how to wire it. Originally it had an old magnetic switch, which basically is a DPDT center off switch. The original motor only had 3 wires going to the switch.
I now have a dual voltage, capacitor start motor with auto thermal reset and the following leads. (J10, T2,T4) (T8, P2,T3) (P1). To reverse direction switch the T8 & J10 leads. Low voltage (110v) leads to (P1) & ((J10,T2,T4) OR (T8,T2,T4)).
Is there a way to wire this up so its reversible with the existing switch? If so I haven’t figured it out yet. If not what else might I need?
Thanks
Tim

Bob · Jan 6, 2011

You need 4 wires to the reversing switch or 6 wires if it will also start and stop the motor.

With the old system, did the magnetic contactor start and stop the motor, as well as reverse it?

Will you still need to use a magnetic contactor or can you go to a manual 6-wire "drum switch"?

If I have a correct mental schematic of this, you know have a special motor with 2 sets of start windings, one for each direction, and a DPDT contactor which starts and stops the motor and selects the direction. You may be able to retain the start and stop function of the present contactor and add a DPDT relay that will transpose the connections of the T8 and J10 leads.

Wire it so it is energized when the original contactor is in one position and not the other.

Another way of doing it on the cheap would be to replace the existing contactor with a pair of mechanically interlocked DPDT contactors.

You could scarf one of those from a surplus industrial-sized garage door opener.

There's one on my FAVORITE place, fleabay, right now, auction # 400013722279, buy it now for $45.00.

<img src = "http://i53.tinypic.com/33nk9p5.jpg">

TimWafer · Jan 6, 2011

[b:67c3c9b814]Yes the original switch did also start & stop the motor. Cant use a drum switch as it is controlled from a couple remote locations through the contactor.
Your suggestion of replacing the existing contactor with one like your example seems to fit the bill. In theory my situation is similar to a garage door with remote door buttons.
Thanks
Tim[/b:67c3c9b814]

(quoted from post at 21:03:04 01/06/11) You need 4 wires to the reversing switch or 6 wires if it will also start and stop the motor.

With the old system, did the magnetic contactor start and stop the motor, as well as reverse it?

Will you still need to use a magnetic contactor or can you go to a manual 6-wire "drum switch"?

If I have a correct mental schematic of this, you know have a special motor with 2 sets of start windings, one for each direction, and a DPDT contactor which starts and stops the motor and selects the direction. You may be able to retain the start and stop function of the present contactor and add a DPDT relay that will transpose the connections of the T8 and J10 leads.

Wire it so it is energized when the original contactor is in one position and not the other.

Another way of doing it on the cheap would be to replace the existing contactor with a pair of mechanically interlocked DPDT contactors.

You could scarf one of those from a surplus industrial-sized garage door opener.

There's one on my FAVORITE place, fleabay, right now, auction # 400013722279, buy it now for $45.00.

<img src = "http://i53.tinypic.com/33nk9p5.jpg">

OT- wiring electric motor?

TimWafer

Member

Bob

Well-known Member

TimWafer

Member

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