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Thread: new drive for Panasonic Minas S series motors

  1. #21
    Member jmelson's Avatar
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    Default Re: new drive for Panasonic Minas S series motors

    It has been quite some time since I did this, so my memory is a bit vague. But, looking at the code I wrote, it appears the data
    is at 1 Mbit/second, and I think the first 3 bits are the Hall signals, and the next 3 are the complement of the Hall signals.

    Jon



  2. #22
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    Default Re: new drive for Panasonic Minas S series motors

    I hooked up a usb converter that can do 1M serial. Sent the output to a 75als191 differential driver and tried to feed the REC leads on the panasonic drive. . still get encoder error.
    Out of ideas. Perhaps my inter character time is too long. I was sending and ascii ctl-g or a "c" to simulate the commutation signal.
    Anyone actually know what the Pansonic drive wants to make it self happy?



  3. #23
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    Default Re: new drive for Panasonic Minas S series motors

    Quote Originally Posted by gm276 View Post
    I hooked up a usb converter that can do 1M serial. Sent the output to a 75als191 differential driver and tried to feed the REC leads on the panasonic drive. . still get encoder error.
    Out of ideas. Perhaps my inter character time is too long. I was sending and ascii ctl-g or a "c" to simulate the commutation signal.
    Anyone actually know what the Pansonic drive wants to make it self happy?
    I'm a little vague on this, but my recollection is that the first 3 bits are the 3 commutation signals, then the next 3 bits are the
    complement of those signals. I don't recall, but I don't remember that there was any parity bit on this. I think it
    was an 8 bit byte with probably 2 stop bits. if this isn't enough to get you going, I could scope it out, as I use
    a MUMS motor to test my converters.

    Jon



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    Default Re: new drive for Panasonic Minas S series motors

    Jon,
    I would love to know what the MUMS puts out. I wonder what the differential voltage needs to be (now putting out 0 volt and 5 volt). Parity or not. Least significant bit sent first?
    Inter character time? Thanks for any of your info.
    Don B in pa



  5. #25
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    Default Re: new drive for Panasonic Minas S series motors

    Quote Originally Posted by gm276 View Post
    Jon,
    I would love to know what the MUMS puts out. I wonder what the differential voltage needs to be (now putting out 0 volt and 5 volt). Parity or not. Least significant bit sent first?
    Inter character time? Thanks for any of your info.
    Don B in pa
    OK, I'll try to get a scope on it this weekend. It is 5 V differential, as in 26LS31 / 26LS32 type drivers.

    Jon



  6. #26
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    Default Re: new drive for Panasonic Minas S series motors

    Jon, I think I have it.
    After a bit of head scratching and some time with the scope.
    bits 1 2 and 3 are the hall states. bits 4 5 and 6 are the complements of the hall state but in reverse order.
    bit 7 is set and tells if there are one or two hall state on. bit 7 set to 1 if two hall states at once.
    the bit rate as you said, 1 megahertz. The character rate 83k.
    Thats what I see with the scope.
    Regards,
    Don B



  7. #27
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    Default Re: new drive for Panasonic Minas S series motors

    Jon,
    I managed to get my own mums motor. So all of the above was from observation of the rx leads.
    Don B



  8. #28
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    Default Re: new drive for Panasonic Minas S series motors

    Glad you were able to figure this out! I didn't know about the reverse order of the complement bits, I didn't use those
    in the converter I made. I'm guessing bit 7 is a parity bit.

    Have you gotten something to work with your drives, yet?

    Jon



  9. #29
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    Default Re: new drive for Panasonic Minas S series motors

    Jon,
    No, starting to think the drives are bad. ERROR 22
    I am waiting for some connectors but I did hook up the output of the rx leads from the mums motor and still the error persisted.
    I will try once more with some better cables.
    Don B



  10. #30
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    Default Re: new drive for Panasonic Minas S series motors

    Well, are you sure the drive supports the motor you are trying to connect? I've never worked with the Panasonic
    drives, I just got some motors cheap on eBay quite some years ago. I make my own brushless drive system.

    Jon



  11. #31
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    Default Re: new drive for Panasonic Minas S series motors

    A better day today. Got the servo drives in the green !
    Wired a non MUMS motor except for the RX (since this motor has none) then I pumped in the output of a real mums motor to the RX on the drive.
    Next step to create an artificial RX signal.
    Don B



  12. #32
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    Default Re: new drive for Panasonic Minas S series motors

    GREAT! Now that you have a motor there with the right protocol, you can examine it at your leisure, and it proves
    your drives are OK, too.

    Jon



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