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Discuss Help Wiring Motor - Reversing Starter in the Industrial Electrician Talk area at ElectrciansForums.co.uk.

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  1. carbitz
    Offline

    carbitz New EF Member

    Location:
    leeds
    Hello Chaps

    I have inherited a motor with no starter. I have therefore bought a new switch but i am struggling to connect up. I would be very grateful if any forum members could give me some advise should they be familiar with this setup? It is a single phase motor, and i am trying to add a DOL reversing starter.

    20180618_092803.jpg

    20180625_125306.jpg

    20180626_124309.jpg

    20180626_124321.jpg
     
    • Optimistic Optimistic x 1
  2. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    You need to change the rmc of the start winding.
     
  3. Andy-1960
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    Andy-1960 Electrician's Arms

    Location:
    Wolverhampton
    ^^^What he said!

    The mains wiring in the starter will need to be altered as that is a 3 phase starter. Also you will need to check that the coil voltage is 230v.
     
  4. Pete999
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    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Business Name:
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    or lower
     
  5. Pete999
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    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
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    I could be completely off track here but what makes you say its a 3 phase starter, are you talking about the old one or the new one?
     
  6. carbitz
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    carbitz New EF Member

    Location:
    leeds
    On the box the starter came in it states "single or three phase" if that helps, it came pre-wired, except for the thermal overload which i added on.
     
  7. Marvo
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    Marvo Admin and gender confused Staff Member

    Location:
    South Africa
    4.jpg

    Apologies for the attrocious drawing, there's a reason I usually use CAD or Visio....

    If the motor is cap start with an internal centrifugal switch, from memory this is the scheme for the power switching side of things. I'd usually just use a separate manual motor starter for thermal overload protection but I'd even omit that if the motor has a built-in current operated manual reset button.

    If I've got time later I'll look in the Klokner Moeller schematic reference book and see if there's a betterr circuit diagram.....or even better I'll upload the book into the resources section of the forum.
     
  8. Andy-1960
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    Andy-1960 Electrician's Arms

    Location:
    Wolverhampton
    Just looking at the pic it looks like the link wiring from the bottom of the FC contactor going to the bottom of the overload is incorrect, this should go in between the contactor and the overload, but again this is for 3 phase.
    For single phase the single phase current has to pass through all three elements of the overload or it will trip. Have to trick the overload into thinking it is seeing three phases, hence the rewiring.
     
  9. PEG
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    PEG Trusted Advisor

    Location:
    Manchester
    Never mind about the DOR,what about the terrible language,on the top of that drawing,Marvo...;)
     
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  10. Marvo
    Offline

    Marvo Admin and gender confused Staff Member

    Location:
    South Africa
    It says 'cont' as in short for contactor....:eek:
     
    • Like Like x 1
  11. PEG
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    PEG Trusted Advisor

    Location:
    Manchester
    I believe you ;)
    ...unless i've been "cond" ... as in short for "condenser" :)
     
    • Funny Funny x 1
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