Re: BP Power supply

Nathan, I can send you the schematic from my Bridgeport that shows
both the Sigma and the Superior motors terminals. You can tell
which is which by the photos. The windings are completely different
so you will need to know how the internal windings are connected for
each specific brand motor. I used a 75v DC 15 amp powersupply. My
installer selected the size since we were driving 3 motors at about
5 amps per motor. When under the rare instance all 3 motors were
moving all out it could handle the total current. The installer is
a professional CNC repair person, so I had to trust his knowledge at
that point. I am only telling you how he explained it to me. He
did not do any calculations based on the Gecko white paper. We
never could figure out exactly what amperage to set the motors to
but I have info that says the Sigmas are 9.0 bipolar and 12.7 amps
unipolar as I remember. I don't know how to figure what the current
would be at half-winding in series as seems to be recommended for
the Gecko drives.

The sad thing is all this for me is that I bought new stepper motors
this week at about $1800.00 and they do exactly the same thing the
old motors did with maximum rates of only 20 ipm. Seems to be the
Gecko drivers and I may have to break down and spend another $1000
on Anaheim Automation microdrives.

If you want the scans of the motor wirings just email me at
clarkfamily5@..... (remove the last 2 periods) and I will send
it to you.

I hope this is of some help to you!

Keith Clark

If you want the schematic
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "rocketscientistnate"
<rocketscientistnate@y...> wrote:

> "Keith Clark" <mail@t...> wrote:
> > Nathan, I used http://www.transformertechnology.com/ and just
> > bypassed all the Bridgeport power since it was dirty and burned
> two
> > motion board chips in a row. It is easier to control by the
> > computer using relays for emergency situations etc.
>
> Which transformer did you buy and how much did it cost? The
> installation info on the geckos says 24V - 80V, what seems to work
> the best on BP steppers? What Amperage does the supply need to

put

> out? It says 67% of the motors rated phase current which should

be

> a little under 6A, would that make it an 18A or higher power

supply?

> I can't find anything on the size of my motors, except inside the
> back plate it gives some part numbers 025805 and 26744 (one is the
> alternate motor for the other) The power supply seemed to be

pretty

> stable before my control died, so I'll try to reuse it for now and
> replace it as soon as I can.
>
> Thanks
> Nathan