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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > Nema 34 controller with error check
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  1. #1

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    Nema 34 controller with error check

    I have 2 open loop nema 34 motors driving my y axis. They each use a Dma860h controller. The motors are 34hst9805.

    Can anyone recommend a controller that has error checking? I would prefer for the machine to shut down if there is a problem but because these are open loop there is no fail safe. Makes me nervous.

    Thanks.

  2. #2
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    Re: Nema 34 controller with error check

    Quote Originally Posted by grantx View Post
    I have 2 open loop nema 34 motors driving my y axis. They each use a Dma860h controller. The motors are 34hst9805.

    Can anyone recommend a controller that has error checking? I would prefer for the machine to shut down if there is a problem but because these are open loop there is no fail safe. Makes me nervous.

    Thanks.
    You need closed loop drivers and motors for that.
    Not possible with open loop.

    If your motors are dual shaft you could fit encoders and get new drives but personally I would ditch Nema 34 size and drop down to 24 size motors while you're at it.
    They'll be a lot quieter.

    I've noticed you are on mycncuk and it lists ayou as in uk.
    If that's so.... Shoot Dean (Jazzcnc) a msg on there about the Lichuan LCH2102's and LCD86's


    But.......... If you are a serious machiner and do a lot of stuff....... Go for servo's with A2 / A4 drives

  3. #3

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    Hi. Yeah I'm in the UK. I have already spoken to Dean and he has been quite helpful. My question is, if put closed loop drives and motors on the y axis will that eliminate the chance of the gantry twisting? Ie, do the controllers monitor each others position?

    Quote Originally Posted by dazp1976 View Post
    You need closed loop drivers and motors for that.
    Not possible with open loop.

    If your motors are dual shaft you could fit encoders and get new drives but personally I would ditch Nema 34 size and drop down to 24 size motors while you're at it.
    They'll be a lot quieter.

    I've noticed you are on mycncuk and it lists ayou as in uk.
    If that's so.... Shoot Dean (Jazzcnc) a msg on there about the Lichuan LCH2102's and LCD86's


    But.......... If you are a serious machiner and do a lot of stuff....... Go for servo's with A2 / A4 drives

  4. #4
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    Re: Nema 34 controller with error check

    Quote Originally Posted by grantx View Post
    Hi. Yeah I'm in the UK. I have already spoken to Dean and he has been quite helpful. My question is, if put closed loop drives and motors on the y axis will that eliminate the chance of the gantry twisting? Ie, do the controllers monitor each others position?
    TBH I don't know much on closed loop systems.
    However. I assume that if you tie in all the alarm and enable signals (either parallel or series depending on switching position) they will all shut down together and prevent twisting to a large degree.
    That's my take on it anyway. Likely you'll still have to double check it afterwards.

  5. #5

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    Yeah I will wire into the emergency stop circuit so the whole thing shuts down if there's a problem.
    What cnc do you have?

    Quote Originally Posted by dazp1976 View Post
    TBH I don't know much on closed loop systems.
    However. I assume that if you tie in all the alarm and enable signals (either parallel or series depending on switching position) they will all shut down together and prevent twisting to a large degree.
    That's my take on it anyway. Likely you'll still have to double check it afterwards.

  6. #6
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    Re: Nema 34 controller with error check

    Quote Originally Posted by grantx View Post
    Yeah I will wire into the emergency stop circuit so the whole thing shuts down if there's a problem.
    What cnc do you have?
    Just a 3 axis mill conversion for now. Amadeal AMAT25LV.
    Doing an electronics upgrade atm to a UC300eth, UCBB, bigger drivers, and putting a 1.8kw servo on the spindle.
    Been gradually putting the machine together for a while.

    Should've had it finished ages ago but things happen.

    There's a lot of people out there that don't bother with things like the enable, as drivers are enabled by default. Relying on software shutoff.
    I always wire mine in, tie it into a relay, and hook it up into the estop.
    That way you have both a software and a hardware safety circuit.

  7. #7
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    Re: Nema 34 controller with error check

    If you use this kind of closed-loop stepper Motor, it has alarm output

    https://www.automationtechnologiesin...op-stepper-kit

  8. #8

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    Re: Nema 34 controller with error check

    I wouldn't mind upgrading to the AXBB-E. I will at some stage in the near future, then I don't have to do the whole USB thing.
    I understand that the UCCNC software is also very good.

    Why would you switch through a relay? There is no load is there?

  9. #9
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    Re: Nema 34 controller with error check

    Quote Originally Posted by grantx View Post
    I

    Why would you switch through a relay? There is no load is there?
    Depends how you have it set up.
    My estop circuit is 24v set as active high (I think) normally closed circuit. When there is 24v present the machine is 'ready', when it's 0v the estop is active.
    My enable circuit is on 5v (when the 0v of this is signalled the drivers disable) so I can't just simply splice it and the stop circuit together.

  10. #10
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    Re: Nema 34 controller with error check

    Using Linuxcnc if your drives have an error output, you can connect them to an amplifier fault in input
    Rod Webster
    www.vehiclemods.net.au

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