Re: [CAD_CAM_EDM_DRO] It's ALIVE!!!

Dan,

Could you enlighten me on why we would derate the amps by 71.5%. I am in the
middle of setting up a sherline mill with a set of PowerMax II steppers with
a series rating of 2.8A. According to your statement, I should be running
them at ~2A. Wouldn't this reduce the torque by ~28% also?

George

----- Original Message -----
From: "Dan Mauch" <dmauch@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 30, 2002 10:14 AM
Subject: RE: [CAD_CAM_EDM_DRO] It's ALIVE!!!


> Another very common mistake is that the per phase amperage rating for a
> common 6 wire motor is for the unipolar wiring configuration. However
> most guys are using bipolar choppers set in the bipolar series
> configuration so you should set the current for 71.5% of the rated
> current. Thus a 6 wire motor that was rated at 2Amp when used with a
> bipolar chopper driver in series wiring should be set for 2A X .715 =
> 1.43 amps.
> Dan
>
> -----Original Message-----
> From: Tim Goldstein [mailto:timg@...]
> Sent: Friday, November 29, 2002 7:54 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] It's ALIVE!!!
>
>
> If you have near recent Gecko G2xx drives you would have idle current
> reduction. That should keep the motors from getting very hot at all when
> they are idling. You did not mention what voltage you are using or the
> current you are set for. If the voltage is pushing up towards 25X over
> voltage or your current is set too high you will get lots of heat.
>
> > -----Original Message-----
> > I finally got everything straight in Mach1 and my setup is now
> > functioning. Now just need to figure out my settings for my motor.
> > More research.
> >
> > Are the motors supposed to be getting hot setting idle. Mine feel
> > very hot.
> >
> > Thanks,
> >
> > Barclay
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
>
>
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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>