Re: [CAD_CAM_EDM_DRO] AC Servo's

In message <42FD69EA.6080501@...>, Jon Elson
<elson@...> writes

Jon

>>The drives are MR-S series which are Digital drives, but use
>>Mitsubishi's own proprietary protocol. Its seems very unlikey that
>>they could be used with any of the current PC based controls.
>>
>>
>Well, look into it before giving up. There may be a way to set the servo
>drives up for either analog velocity command or step/direction. If it will
>take analog velocity, then you can use a Servo-to-Go card, or my PPMC
>board set, to drive it.

Well quoting directly from the maintenance manual for the drives.

"Features of the S2 series servo system

Control by means of volume control with analogue circuit previously
employed, have been completely replaced with TG race and digital
control"

What TG Race means I dont know.

>Yes, keeping the drives is the best option, if possible. Some drives can
>accomodate a variety of motors, others are strictly proprietary. You need
>to check if the encoder has standard commutation outputs, or if the motor
>provides these (the typical Hall A,B C outputs.) Yaskawa servo pack
>drives use a proprietary scheme where the "Z" channel of the encoder has
>a phase relationship to the A and B encoder tracks that gives the drive
>the index position as well as the commutation info. So, both the drives
>and the motors are totally proprietary, and can't be used with anything
>else. A number of other makers have similar schemes.

Yes I've seen quite a few too. Gets pretty costly very quickly !

Though Its quite amusing seeing so many drives out there with Step/Dir
inputs!

>Given a little more info, we might be able to track down some info on
>these motors and drives. I did find some Mitsubishi info on
>mel servo amps of the MR-J2S series. The MR-J2S-A takes analog
>velocity command inputs. The MR-J2S-B uses SSCNET. The MR-J2S-CL
>is basically a one-axis NC control, kind of like a super-indexer.
>This document is at
> http://www.mitsubishi-automation.de/service/techcat/pdf_download/113788.pdf
>Acrobat 5 says the document is damaged, but Acrobat 7 reads it fine.
>(Usually, Acrobat will say the document contains functions it can't display
>and then renders it the best it can.) This document lists compatibility
>with
>HC-xxxx motors, so your drive may be an earlier model of this series.

Its a shame the motors dont have any real info on their plates other
than model number and ser #.

I've not put power on the machine yet, I should get some time next week
to wire it up. Just to see what errors if any i get.

Wayne....

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Wayne M Weedon Email: wayne@...
Fdos Design Poole UK
Tel +44-1202-677025 Fax +44-1202-770515 Mobile: 07774 439915

Specialists in small batch & Production Mechanical/Electrical Engineering
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