Re: Power supply for Servos - Energy dump and such

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...>
wrote:

>
> >I'm building another control and I'm going to use a 1000va at 62
> volts. The DC will be >88 volts and the Geckos should handle it.
> Marris said they actually come apart at 118 >volts and 30 amps
> >
> > Ron
>
>
> Stop the presses. Be careful there. Yes Mariss did say the drives
> will come apart at 118 volts. But he didn't mean they could run
> there. Fact is, most of the high voltage components in gecko

drives

> are rated for 100Vdc. The caps, and fets are 100Vdc parts.
>
> Wally
>

If you can read between the lines, Gecko's servo drivers are 100
volt, 10 amp units with a 70 de-rating for cuttent and a 20% derating
for voltage.

As Mariss has documented over and over, they do not come apart at
less. once you move above the 7amps, 80 volts you start exchanging
speed and power for unit life. I think at 118 volts you get
bragging rights of the most power for the better part of a minute.

But, if you read the recent post about servo's and how to size them
using power for the machine, Mariss points out that most of us run
much more voltage than we either need or use and wind up with hot
motors for no logical reason.

If you really need to get that power, considder bigger motors.

Dave