Re: AC servos

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@...> wrote:

>
> I first ran into this with Super Vexta drives, they had the two
> inputs marked CW and CCW, and a mysterious switch labeled
> "1P/2P". When I flipped the switch to 2P, it worked as
> step/direction. I have since seen this in a lot of Japanese
> motion control gear. So, no, the SGDA-xxxP drives take
> opto-coupled step and direction inputs, when set for that mode.
> You set all the parameters by connecting a PC serial port to the
> drive and running a downloadable program from Yaskawa.

Hi Jon, I've found some Yaskawa ServoPack SGDH-04AE drives on ebay,
item number: 170126303284

Price looks good ($201 or best offer) so I'm asking for a price for a
pair with shipping to the UK.

It looks like they can run in three pulsed modes, one is step and
direction, the other CW/CCW and the other the 2-phase quadrature mode
(which can also have a pulse multiplier applied to it).

So all looks good, hook up seems fairly straight forward, I have one
set of motor/encoder leads already and the details on the other cables
are available on the website along with the required connectors.

Its also great not to have to build a PSU for a change as we have 230v
out of the plug.

Something else I wanted to check; one of my motors is 100W and the
other is 200W, will these be big enough for a router doing typical
duties in wood and ali? At the moment the larger motor is on the
smaller stage as this was origionally a vertical axis but I think it
would make more sense to swap them. Both actuators have 5mm lead
screws,the smaller motor has a 5:1 planetary on the output and the
larger motor is directly coupled.

Cheers,

Graham