On 04/09/2019 08:40 AM, Roland Jollivet wrote:
Are you sure they are "dumb" drives? These appear to be
I worked with some a long time ago, from an earlier series.
The encoder is proprietary, the AB are normal, but the C
track looks like the AB, but apparently has a phase shift
that tells you what quadrant you are in. The drives
internally convert the encoder to standard ABZ quadrature
with index, to send to the controller. There should be a
serial interface (can be hooked to RS-232 or RS-485) to a
PC, and use Yaskawa's configuration program.
Early drives were positioning only or speed only, later
drives could do either via configuration.
I set up a SGDP drive to run in both analog +/- 10 V mode
and step/direction mode through the utility.
This would be very useful. I have about 12 Yaskawa motors and drives on 2
robots that I could make use of if I could make the absolute encoder data
readable in Linuxcnc..
I have recently acquired a number of motors and one robot. A bit battered.
But I only have a few of the servo drives loose, SGDR-SDA140A01BY22 and
SGDR-SDA060A018. No controller box.
Do you have detailed info on driving these servos? I see that that are
essentially dumb devices, an H-bridge brick and a number of opto isolaters.
It probably isn't too difficult to buzz them out, but all info would be
Emc-users mailing list