Thread: Dc servo driver

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  1. #1
    Hi all,

    I bought 3 dc servo drivers off eBay and cannot really find any information on the case to get any further detailed information :(

    I have the matching motors for the drives which are wired into blocks which slot in so they are no problem.

    This leaves 7 terminal screw blocks.. I've done a test using an old atx psu powering it up using 12v and the motors ran. The supply was connected to terminals 5 and 7 so I assume that 6 is for a ground. Terminals 1,2 and 3,4 are respectively shorted with bits of wire.

    so can anyone help me figure out what 1,2 and 3,4 are and how I may control it?

    I can add a picture tomorrow if that will help.

    many thanks,
    Last edited by Treemonkey; 30-01-2013 at 09:16 PM. Reason: Crap title!

  2. #2
    Is there and make or model number on the drives?
    CNC routing and prototyping services


  3. #3
    Nothing at all, I'm led to believe that they are made by Japan servo co. ltd since they match the motors but from the limited information on the motors I cannot find anything more about them...

  4. #4
    These are a couple pics of the drives in-case my description was a little off

    Click image for larger version. 

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  5. #5
    Silly thought, don't suppose it has an encoder? G.

  6. #6
    Hi G,

    I do believe the motors have encoders attached, I can add pictures of the motors tonight If it helps!


  7. #7
    Might be worth removing the cover from one of the drivers and having a look to see if there is any lettering on the circuit board which might give a clue.

  8. #8
    Hi Sam, I only mentioned the encoder in case that was the answer to the extra wires! G.

  9. #9
    Hi G,

    the encoder is connected using a push in connection. I can only guess that 1,2 and 3,4 can somehow be used to control the motion. I guess that when one set is not shorted the motor will run in reverse leaving the other one as a step input? I will update the thread later when I've tried!


  10. #10
    Hi all,

    I've had another tinker and these combinations will start the motor spinning (always same direction):

    Pins shorted:
    1 , 4
    1 , 2 and 3 , 4

    I have a multimeter If there are any readings that may help work out the pin configuration.

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