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  1. #1
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    Default AC Servo Motor upgrage

    Hi,

    I have a large DIY CNC Router and am looking to upgrade to AC Servo motors due to loosing steps, I have bought some old Mitsubishi SSCNET II servo drivers and am looking for a compatible controller, does anyone have any suggestions.

    Cheers Nigel

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  3. #2
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    You may struggle to find an easy solution.

    I think they use proprietary communication.

    http://www.yurtaev.com/ has interface cards for SSCNET to LinuxCNC.
    I think they are based in Russia though, so can't ship outside at present.

  4. #3
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    Quote Originally Posted by pippin88 View Post
    You may struggle to find an easy solution.

    I think they use proprietary communication.

    http://www.yurtaev.com/ has interface cards for SSCNET to LinuxCNC.
    I think they are based in Russia though, so can't ship outside at present.
    Thank you for the link, I have thought about the LinuxCNC and dedicating an old PC with their OP installed and may have to go that route.

    Yes they are based in Russia so won't be able to buy from them, but that card does look to do the job nicely.

    I was hoping a Masso might work if the drivers would accept singles from their controller.

    I have read that SSCNET does accept G-Code and a company called SoftServo Systems did produce some PC based CNC motion control, but with my drivers being quite old (but not really used because they were from a backup CNC Robotic Arm) I can't find their software listed anywhere.

    With the Mitsubishi drivers being good quality I would really like to use them within my upgrade.

  5. #4
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    Default

    Model numbers?

  6. #5
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    Default

    Quote Originally Posted by pippin88 View Post
    Model numbers?
    This is what I have got.

    Mitsubishi A172SHCPU motion control PLC

    A1SX40-S1 PLC card

    A1SY40 PLC card

    Pendent control SB-700

    3 x Mitsubishi MR-J2S-10B 100w AC servo drivers

    1 x Mitsubishi MR-J2S-20B 200w AC servo driver

    1 x Mitsubishi MR-J2S-40B 400w AC servo driver

    1 x Mitsubishi MR-J2S-70B 750w AC servo driver

    Control module (this control box contains MECS I/O CS-7100-B & MECS I/O CS-7200-A Cards, which look to be for controlling a Robotic movement)

    Cables to connect

  7. #6
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    Default

    I just had a VERY brief look at the data sheet to a MR-J2S-10A; I am not sure what the difference is between the A and B model, but it looks like the servo drivers can be run with pulse and direction so should be compatible with most LinuxCNC motional control boards. I would ditch the Control Modules if you can drive them this way, it will be a lot more simple.

    The big problem is you need to get hold of the PC software so you can tune the drives to suit your application.

    IF you can find the manual for the exact model, (they should be available) throw the links up here and I will have a look tonight.

  8. #7
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    Quote Originally Posted by Pearo View Post
    I just had a VERY brief look at the data sheet to a MR-J2S-10A; I am not sure what the difference is between the A and B model, but it looks like the servo drivers can be run with pulse and direction so should be compatible with most LinuxCNC motional control boards. I would ditch the Control Modules if you can drive them this way, it will be a lot more simple.

    The big problem is you need to get hold of the PC software so you can tune the drives to suit your application.

    IF you can find the manual for the exact model, (they should be available) throw the links up here and I will have a look tonight.
    Hi Pearo,

    I do have a copy of the Mitsubishi MR software for tuning the motors, but I haven't looked at it yet.

    I believe A uses pulse whereas B uses SSCNET the advantage with this system is you can daisy chain the drives together reducing wiring and there is a guy in Russia who has developed a card that uses this system with LinuxCNC, please see link http://yurtaev.com/yssc2p.html

    These are other links regarding this Drivers/System

    http://dl.mitsubishielectric.com/dl/...07/l03007d.pdf

    http://softservo.com/data_sheets/Old..._DataSheet.pdf

    I don't think mine as the Fiber-optic option, but even if it did I am not sure I could take advantage of it.

    I didn't pay anything like what these electrics would have cost new and if I can get them paired up with the right Mitsubishi Servo Motors then they should give me a very good system.

    Thanks for any help you can give me.

    BTW if they would work with Pulse & Direction, I would probably go with the stand alone Masso G3

    Cheers Nigel

  9. #8
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    Default

    You don't have the actual servo motors to match?

    Buying servo motors and drives separately can be an issue.
    Finding the right components, cables etc.

    Having wasted far too many hours and dollars on doing so with an old servo, I would not do it again. Full matched set only for me. Delta make excellent servos.

    Another question is: in what situation are you losing steps? If there is a mechanical issue such as binding, you need to fix that.
    Servos are better than steppers at high rpm. At low rpm, steppers often have a lot more torque than servos.

  10. #9
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    Default

    It seems to randomly lose steps, an example would be I book matched a pair of stair strings it went up the left string first and did every tread correctly, but when it moved across to come back down the right string it was 5mm out, so to get over the problem I ripped the left string down by 5mm. Like I have said my machine is quite large for a DIY machine the cutting area for X is just over 2000mm and Y is 3200mm, so having a closed loop system would be better for me.

    I can get the correct Mitsubishi Servos Motors to match the drivers, I don't think that is a problem there are a few models to pick from and I got the cables included with the drivers.

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