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  1. joel89
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    joel89 Regular EF Member

    Hi all, I have got to build a small panel for a overhead crane long travel drive motors (Old Street crane) The motor is is a 2 speed pole changing motor 750rpm and 1500rpm it needs both slow and fast speed and it also has a link between across 1ph of the slow and fast winding in the motor terminal boxes.

    I am guessing this isnt a standard 4 contactor method (slow, fast, fwd, rev) I have been told I may need a pole changing contactor? anybody got any drawings of a reversing pole changing circuit?

    Cheers
     
  2. cliffed
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    cliffed Regular EF Member

    Location:
    Lancs
    Sounds interesting,go to kenwood motors site,there are some good ideas there.
    At the moment trying to find 2 speed controller for a 4 pole motor.
     
  3. Andy-1960
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    Andy-1960 Electrician's Arms

    Location:
    Wolverhampton
    I believe this is called a Dahlander starter, a few years since I've done one of these!

    29BDDC72-81F2-49B6-A187-D39F684B7F75-910-000002E62E204618.gif

    38555669-7AE3-49D0-B48B-AEEFA95C3EAC-910-000002E63D9A23B4.gif
     
  4. joel89
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    joel89 Regular EF Member

    thats good i need reversing too, i would imagine i could add FWD & REV contactors in before the mains then feed the other contactors? and that is a 6 wire mines five ive never come across this type of circuit before
     
  5. Andy-1960
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    Andy-1960 Electrician's Arms

    Location:
    Wolverhampton
    Yes you can put another pair of contactors upstream to reverse.

    I used to do the starter above by putting K1 in the middle with K2 and K3 on either side, you can then put mechanical interlocks between K2 - K1 and K1 - K3.
     
    Last edited: Apr 15, 2017
  6. cliffed
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    cliffed Regular EF Member

    Location:
    Lancs
    Well done ,interesting stuff,love it
     
  7. joel89
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    joel89 Regular EF Member

    spoke to a crane electrician today, they use 5 wire to avoid using 4 contactors and 6 wires.

    2 contactors fwd + rev and pole changing contactor 2 phase NO/NC. cheating way of doing it really
     
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