Re: [CAD_CAM_EDM_DRO] PSU for my first project

Ian,

I have some information on my web page www.campbelldesign.com. If you need
more detail, I have another page that is not listed.

VA (Volt amps) is just volts * amps. A dropping resistor cam be about 1.5K
at 5 watts.

My transformer comes with two secondary windings. I always connect them in
parallel. If you want 60 to 65 volts, the AC on the secondary should be
60/1.4 which would be about 42 volts. A 48 volt secondary would give you 67
volts. (48 * 1.4).

Bob Campbell

----- Original Message -----
From: <i.jones@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, December 14, 2002 4:14 AM
Subject: [CAD_CAM_EDM_DRO] PSU for my first project


> Hi all,
>
> Although a newbie to the world of CNC and electronics I am going to
> attempt to CNC an old lathe I have.
>
> I have been viewing the excellent advice given on the group and have
> tried to collate the info I need to build a power supply. I would be
> grateful is somebody would look at my proposed shopping list and
> tell me if I am on the right track.
>
> UK voltage.
>
> I plan to use 4 x Gecko G210 drives to power 4 x Sanyo "H" Series
> Stepper motors. I have not decided on the spec of all four yet, but
> will try a Size 34 double stack 4A/phase 4 lead 4.91Nm to start (for
> the lathe carriage) and then increase/decrease spec to suit.
>
> I have been told that I will need a power supply producing around 60
> to 65Vdc and that 1 Amp for each motor should be allowed. I have
> also been told that I need a linear power supply e.g. transformer,
> bridge rectifier, smoothing capacitors (with discharge resistor).
>
> With this in mind I plan to buy the following.
>
> Toroidal Transformer
> 2 x 60V Sec (or should I buy 2 x 30 Secs?) I do understand what is
> meant by the rating VA. They seem to range from about 50VA up to
> 1000VA, is there a formula for calculating my requirements. I am
> guessing I need about an 8A supply?
>
> Bridge Rectifier
>
> 400V PIV 35A 280V RMS ?
>
> Capacitor(s)
>
> 100V 15000uF from Bridge rectifier
> 100V 470uF across power terminals on each driver
>
> Volt meter display
>
> I guess these are pretty standard specs ?
>
> Heat sinks
>
> Will I need heat sinks for the Gecko's ?
>
> Discharge resistor
>
> Not sure about this one !
>
> Any links to schematics would be appreciated, although the one
> posted recently on the Gecko site looks pretty straight forward.
>
> Thanks in advance, and apologies for the basic questions. I did a
> search on Toroidal but did not come up with much.
>
> Regards,
>
> Ian
>
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