Changing a motor's direction each time power is supplied

[KeepItSimpleStupid]

You did say 220 VAC implicitly. Note that reversing a single phase motor doesn't come easy: **broken link removed**

Any you really don't want to be reversing it when it's running and that's where stuff gets messy.

 

[StewartVivonne]

No definitely not reversing while running. the existing control box already handles the stop start and timing. I just need it to turn a different dirrection each time it is started. so I'm trying to add after the existing control box.
I'm thinking of disconnecting the condo at the motor, add a latch relay and DPDT relay after the existing control box, cable in the condo at the DPDT and feed a 3 wire cable to the motor.

 

[4pyros]

Do you have the specs for the motor?

 

[StewartVivonne]

AC Motor
20w 1.8microfarads F/450V 220V
50Hz 1250rpm
60Hz 1550rpm

Model YN70-20
http://www.linixmotor.com/1-transmission-gear.html

 

[alec_t]

Won't a vaccum turning backwards, blow?

Good point, KISS.
Also, any control circuit will have to ensure that the direction of rotation (assuming vacuum is possible in both directions) is set before power is applied to the motor. So IMO two relays will be needed.

 

[StewartVivonne]

the vacuum is a different apparatus entirely, its tube is attached next to the motor i want to reverse. My bad, the vacuum is a red herring

 

[alec_t]

So what is the motor for, if not for the vac?

 

[KeepItSimpleStupid]

The YN series is reversible, but no wiring diagrams on the site that I can find. Though it might be a synchronous motor, but they already have a category for that.

I'd check for a motor nameplate with reversing instructions or look for wires labeled with things like T1 T2 etc. Sometimes all of the wires are black with white lettering on the wires themselves.