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  1. #1
    Join Date
    Feb 2012
    Location
    Tamworth, NSW
    Posts
    68

    Default 2 speed switch wiring - 3 phase motor

    Hi there

    I am hoping someone may be able to chime in with some advice on wiring up a switch that is on an old BCA Jig borer. The machine has a 3 phase 2 speed motor. The three phase power comes into the machine stand isolation switch and then from there to the two speed switch. On the power input side to the switch there are 4 wires - the three phases and an earth. On the motor side there are 6 wires and happily they are tagged with wire identifier and these match up with the switch terminals so this all seems very straight forward and matches the wiring diagram I have which I have attached a pic of.




    Here is the switch





    My confusion is that there is no obvious terminal to run an earth wire (the 4th wire come in on the power side of the switch). I am not sure where this should go?

    Interestingly there is one terminal that has been left wired as shown below - this is the only wire that was left on the switch and all other wires were tagged and it is obvious where they go. B1 green wire connect and then there is the black wire to the only terminal on the switch that doesnít have a label on it which has made me suspicious of it and if.


    So can anyone shed any light on where I should be looking to send the earth to?

  2. #2
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,359

    Default

    Hi Danger Mouse,

    The earth wire goes to the frame or body of the machine ! In the case of the switch it would probably be under one of the screws that fasten the switch to the machine.
    Best Regards:
    Baron J.

  3. #3
    Join Date
    Feb 2012
    Location
    Tamworth, NSW
    Posts
    68

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Danger Mouse,

    The earth wire goes to the frame or body of the machine ! In the case of the switch it would probably be under one of the screws that fasten the switch to the machine.
    Thank you Baron, that had been my first thought and then I started to second guess myself.

  4. #4
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    8,396

    Default

    Hi,

    Is there any single phase required on the machine?
    One thing to watch for on old machines is earth used as neutral.
    I don't think its the case here but I wonder where the other end of that green wire is.

  5. #5
    Join Date
    Feb 2012
    Location
    Tamworth, NSW
    Posts
    68

    Default

    Quote Originally Posted by Stustoys View Post
    Hi,

    Is there any single phase required on the machine?
    One thing to watch for on old machines is earth used as neutral.
    I don't think its the case here but I wonder where the other end of that green wire is.
    From the switch there isnít any single phase and I have it running successfully now. Interestingly on the machine from the initial isolation switch a single phase line does go to another box that seems to have a transformer and outputs a DC current that connects to a lamp. The reason I say it appears to do this is that the end of the light has a 2 pin polarised plug like you see in caravans and other 12v outlets. The wiring here is all connected and no need for me to touch it.

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