Relay wiring

Discussion in 'General Electronics Chat' started by 60rpm, Jul 22, 2015.

  1. 60rpm

    Thread Starter New Member

    Jul 3, 2015
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    Hi guys,

    I have a Siemens PLC and I'm trying to control a 24VDC conveyor.

    However I need to use a relay as the conveyor is too big of a load to be used by a digital output

    The only relay that is readily available is no longer in production and following phone calls there is no datasheet available.

    There is a wiring schematic on the relay itself included in the thumbnail.

    I connected the relay up to the 24V and Common and measured 24V across it but I have no idea where I wire the Live and Neutral of the conveyor.

    I tried looking online for help but there only seems to be automotive relay tutorials.

    Can anyone give me advice how to wire it, or would I be better off purchasing a newer relay with datasheet etc?

    Thanks.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    That is a 4PDT relay. It has enough contacts to switch almost anything...

    Its current rating hardly seems adequate to switch a 240V motor. What is the HP rating of the conveyor motor?

    There are lots of similar 24Vdc coil relays available...
     
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  3. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    I think it's for a 24Vdc motor. Where did you get 240V? We still need the motors current rating.
     
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  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You do not mention the type of AC motor, if 3ph then you should use a 3ph reverser contactor which has electrical and mechanical interlocks built in, I also usually use interlocks in each rung.
    If 1ph then you need the connection diagram of the motor to reverse the start winding.
    You can get the reversing contactor with 24vdc coil.
    L & N is not used as a term if using a DC motor.
    Max.
     
    Last edited: Jul 22, 2015
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  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    I misread it. However, a 24V motor draws 10X the current that a 240V motor would draw, so my question still stands. A 6A resistive rating on a relay is totally inadequate for all but the tiniest inductive load like a motor...
     
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  6. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    I'd probably just buy a solid state relay and discard the electromechanical one
     
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  7. cmartinez

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    Jan 17, 2007
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    But everyone here's right... we first need to learn the motor's current rating
     
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  8. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    It is a 24VDC motor as stated in his first post. But why did the TS use the terms line and neutral? A simple misstatement? When the TS supplies the current required by the motor, s/he can clarify this confusion.
     
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  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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  10. 60rpm

    Thread Starter New Member

    Jul 3, 2015
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    Apologies for the confusion.

    It is indeed a 24V motor I can see why there was confusion when I used Live and neutral.

    Thanks for all the replies guys and for telling me what relay it is.
     
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