Wiring a single phase motor switch?

Hey all,

I have a single phase motor which i bought for a tapping machine.

Ive tested it by wiring a plug with the 3 wires directly into the appropriate motor contacts. It works fine.

I have purchased a NO NC switch from ebay:

**LINK**

I just need some advice on wiring the motor to the switch. I'm not sure which colours go to the green or red switch?

Thanks,

James

James,

The unit you have bought appears to be for use with a Motor Starter, not for direct connection to the motor.

MichaelG.

Often these switch units have a relay inside but it sounds from the description as if this one is designed to control a separate starter relay.or an inverter. Or does it have a latching mechanism?

It might help to post a photo of the inside.

Russell.

PS. Michael, you beat me to it!

Edited By Russell Eberhardt on 03/07/2012 10:23:49

Thank you Michael and Russell for your fast replys. it does want to be a direct connection with the motor yes. The idea in my strange head would be as simple as cutting a standard 240v cable in half, connecting the plain section from the motor to the green and red push button switch, and the plug half of the cable from the switch to the wall socket!

James

From your picture it looks as if you have got the wrong type of switch as Michael and Russel have said.

You have two options, 1. buy a no volt release switch. This will have a momentory push buttons for on and off. When you press the on button a relay will latch on and maintain power to the motor until you press the off button.

The second option is to use a simple on off switch.

Option 1 is safer because if the power is disconnected, the motor will not start without pressing the on button again. With option 2, if the power is removed and the switch is left in the on position the motor will start when power is restored.

If going for option 2 it is advisable to use a double pole switch that switches both line and neutral. In both cases the switch needs to be able to handle the starting current of the motor.

Hope that helps

Edited By John Shepherd on 03/07/2012 11:19:29

John,

An excellent summary ...

MichaelG.

Thank you John. I will go for option 1.

Is this what I want?:

http://www.ebay.co.uk/itm/UNIVERSAL-KJD-NVR-SWITCH-6AMP-NO-VOLT-RELEASE-SWITCH-/280908179527?pt=UK_Crafts_Other_Crafts_EH&hash=item41676ea847

James

Axminister power tools sell a no voltage release switch. I am using one on my lathe and they work fine.

James

The one you have highlighted should be fine (providing your motor is not rated at more that 6 Amps).

With this and similar ones though, remember you will need to provide a box, suitable cable clamps and possibly spade connectors.

Regards

Hi guys,

Thanks for all your help. Here is the finished tapping machine with single phase motor and switch. All bolted down to a cabinet:

Hi all, nothing wrong with that switch but it needs a relay as well to turn the motor on. Often the relay or contactor is in another box away from the motor so vibration does not shake it apart. best thing would be to buy the no volt release switch from axminster tolls and put this switch unit back on e bay. david