Wiring a single phase motor switch?

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Wiring a single phase motor switch?

Home Forums Beginners questions Wiring a single phase motor switch?

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  • #93587
    James Staniford
    Participant
      @jamesstaniford

      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

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      #6218
      James Staniford
      Participant
        @jamesstaniford
        #93593
        Michael Gilligan
        Participant
          @michaelgilligan61133

          James,

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

          MichaelG.

          #93594
          Russell Eberhardt
          Participant
            @russelleberhardt48058

            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

            #93597
            James Staniford
            Participant
              @jamesstaniford

              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!

              Here is an image of the switch:
              photo (8).jpg
              #93599
              John Shepherd
              Participant
                @johnshepherd38883

                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

                #93600
                Michael Gilligan
                Participant
                  @michaelgilligan61133

                  John,

                  An excellent summary …

                  MichaelG.

                  #93603
                  James Staniford
                  Participant
                    @jamesstaniford
                    #93611
                    Mike Wainwright
                    Participant
                      @mikewainwright87512

                      James

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

                      #93616
                      John Shepherd
                      Participant
                        @johnshepherd38883

                        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

                        #95810
                        James Staniford
                        Participant
                          @jamesstaniford

                          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:photo (3).jpg

                          #95837
                          David Lawrence 2
                          Participant
                            @davidlawrence2

                            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

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