Re: gecko's and voltage

Hi Eric,
I'd go conservative depending on the size of your machine. If you let
a table coast or drop, the servo will generate and pump up the supply
voltage somewhat. I like to give 10-15v as a saftely margin,
otherwise, you could try to make an energy-dump circuit to keep the
supply from pumping up. The drive's mosfets have a Safe Operating Area
(SOAin the datasheets, and as the voltage goes up over 80v many
mosfets will drop-off greatly in the current they will handle.

Check the files sections for eneregy dump circuit. Mariss put a good
one there.
-Lee

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnchomeman"
<cnchomeman@y...> wrote:

> I bought some gecko320's. My powersupply (transformer/bridge/cap)
> measures 80.8 volts no load. This is a whole .8 volts over the

max.

> Anyone have any comments on this? I am currently running on 65

volts

> (my transformer has a few taps). I would like to try the 80.8

volts,

> but am new to gecko's and don't want to let the smoke out.
>
> Eric