Re: [CAD_CAM_EDM_DRO] loking for help with power supply for rutex drives...

Just another note on the caps, quality caps rated at 10,000 uf with 100v (sorry) 125 or 150 even,
working voltage can be expensive - look around on the surplus market. A good guide to the
ripple rating of a cap is if the connections are via solder tags or screw terminals into the two connecting
lugs. The screw types are the best and will undoubtedly have a better ripple rating than the solder
lug types. With this type of cap - size is quality !!

Dave Fisher

----- Original Message -----
From: "John Johnson" <johnatl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, December 12, 2003 1:29 AM
Subject: Re: [CAD_CAM_EDM_DRO] loking for help with power supply for rutex drives...


> With 70v AC, you would need a higher voltage cap to be safe, 70 x 1.414
> = 98.98. I'd go at least the next step up, say, 125v, 150v would be
> better.
>
> Good suggestions about the filter and high ripple caps too.
>
> Regards,
> JJ
>
> On Thursday, December 11, 2003, at 01:59 PM, Dave Fisher wrote:
>
> > We use the Rutex drives - Power supply can be very simple - just a
> > straight
> > isolation transformer with an AC voltage output of say 70 Volts.
> > Couple this to a
> > full wave silicon bridge rectifier and electrolytic capacitor rated at
> > 8.000 to 10,000uf at
> > 100 Volt working voltage. This should do the trick - Loads of circuits
> > on the web for a
> > simple supply - email me if you dont have any luck and I will draw one
> > for you.
> >
> > Couple of other comments, you may want to include a mains filter on
> > the input
> > side of the transformer - this would protect against any short spikes
> > etc on the mains.
> >
> > Use good quality caps with a high ripple current ripple rateing
> >
> > You may get away with a single mains transformer to drive all 3 amps -
> > as long as you
> > allow for a good current rateing, which should probably be rated at 20
> > Amps.
> >
> > Good luck
> >
> > Dave Fisher
> >
> >
> > The current rateing.
> > I not really need to be the doubt would
> > ----- Original Message -----
> > From: "keith" <jasonkth@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Thursday, December 11, 2003 7:39 AM
> > Subject: [CAD_CAM_EDM_DRO] loking for help with power supply for rutex
> > drives...
> >
> >
> >> i want to build or buy a power supply for rutex drives. i want to
> >> use three of them to power three 3/4 hp micro 100 dc brush servo
> >> motors on my old knee mill.
> >>
> >> i'm not sure which drive are best fitted to my motors, but i'm
> >> leaning towards the R90H (200V/40A). there are two other sizes
> >> available that i can use if i can find the right power supply for
> >> them. R990H2 (200V/10A) or R990H (100V/20A)
> >>
> >> if i'm to build one,i need help to select the appropriate components,
> >> as i am a machinist, and not an engineer. can anyone reccomend which
> >> components i would need and where to find them? what va rating for
> >> the transformer? what type of rectifier? what kind of capacitor or
> >> filter? any schematics for this?
> >>
> >> or can anyone possibly reccomend where i can buy a power supply?...
> >> just got the motors, can't wait to get this up and running!
> >>
> >> my motor info is as follows:
> >> Nema 42 Face mount with 5/8" output shaft
> >>> 120 Volt Nominal Terminal Voltage Rating
> >>> Torque constant: 5.75 Lb-In/Amp
> >>> Cont Torque Rating: 34 Lb-In
> >>> Peak Torque: 150 Lb-In
> >>> Weight: 14 lbs
> >>> It is rated for up to 120 Volts, 5.8 amps.
> >>> The motor's back-emf constant is 68.6 Volts/kRPM...so,
> >>> The motor will run 15 RPM for every volt you give it.
> >>> For example, on a 48 volt supply, you could expect 700 RPM for a no-
> >> load
> >>
> >> micro 100 reliance electric
> >> model no e723
> >> serial no g000046
> >> date code 2597
> >> revision b
> >> part no 0723-03-049 A
> >> ccustomer part no 3/4 H.P. PWM
> >>
> >> encoder #s heds-5605 A06 0333 A
> >>
> >> regards,
> >> keith
> >>
> >>
> >>
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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
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> Addresses:
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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
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>
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