DPDT relay for AC Motor

[ilirvg]

Hi,

I have a turntable, which rotates cw and ccw, this turntable is rotated by AC synchronous motor of 230V. I want to be able to rotate the turntable with Arduino for this reason I need to control the switch (toggle switch) of the turntable. This switch is connected with motor with three wires one of the wires is for cw rotation the other ccw and the middle one is common or no rotation. Problem is that I need to make sure that only one direction of the rotation will work on the same time otherwise motor may be damaged. So I need to have some restriction not only in program but also in electrical components. I am planning to control the switch with DPDT relay but I do not know if this is possible. Any idea would be appreciated.

Ilir

 

[itsmoked]

Use two relays. The direction-switch one needs to be double throw. A double throw cannot have both directions on at the same time. Wire it just like the switch you have now. The other relay you use to turn it all on or off by interrupting the 'common' or middle wire.

Alternatively you use two double pole relays. You use one pole of each for the direction switching just like your switch. The other poles you use the normally closed contacts to run the opposite relay's coil thru. Then when either relay is ON the Arduno signal for the other relay would be interrupted.

In both cases you need use two Arduno pins and two relays.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[ilirvg]

Thank you.

Ilir