Re: Power supply for Servos - Energy dump and such

With 88V you should be using one of the energy dump circuits Mariss
published.

Wally



--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> 118 volts and 30 amp failure. 88 volts and 15 amps should be fine.

Hope so :-)

>
> Ron
>
> turbulatordude <dave_mucha@y...> wrote:
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me"
> 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
>
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