Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!!

R Rogers wrote:

>Hi Bernard,
> Thank you for taking the time to respond. I did what you suggested and put the 33 v tap and the 12v together in parallel and it works.
>

You must mean series, here.

> I misread those the other day. Anyways I'm getting about 47 volts out of my supply. Jon Elson mentioned on another email that these two sets of taps may not be isolated from one another. Its working so I'm assuming they are. I left my Transformer plugged in for about 2 hours with no load and one lead from each set still connected and it got rather warm, still touchable but warm. is this normal?
>

That may be normal. It is hard to say. If your line voltage is a bit
high, that
may be OK. Generally, if something is shorted out, it will get REAL hot
in a couple of minutes, with lots of buzzing. Some transformers are
designed
with more than enough iron, and they run very cool at no load. Others are
designed with marginal iron, and they tend to run warm.

> Also, do I need all these Capacitors?(they consume 1/4th of my cabinet) Ive got 3 at 100 vdc and 15,000 macrafarads each. On another Email someone mentioned that two at this value should be sufficient. And the bleed resistors are getting omitted due to the responses ive recieved. Everyone is saying I dont need them because Gecko has them built in.
>
>

It depends on the real current draw of the motors. If you need the full
20 Amps from
the Gecko 320s, then you need at least all 3. If your motors will only
take half that,
then you can probably go with 2 caps. Yes, the Gecko drives always draw
some
current to drive the control circuits and encoders, so you don't really
need bleed
resistors.

Jon