Re: gecko questions

Mark,

You are correct. 22K will set the drive to 2.25A which is what you
want to run them at in series. Make sure to follow the mfg's wiring
instructions and insulate the 2 series connections.

If you are running 3 of these motors, the maximum current draw from
the supply will be 4.5A (3 times 4.5A / 3 for series wired). Using
80,000 times 4.5A / 48V yields 7,500uF. Go with anything between that
and 15,000uF. At 48VDC, use a 63V or greater rated capacitor.

If you don't have the cap, take a look at Digikey part number P6495-
ND for a 10,000uF 63VDC part for $7.78 and GBPC1502DI-ND 15A 200V
bridge rectifier for $2.76. www.digikey.com

Hope that helps.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "markpowerplus" <mabw@b...> wrote:
> Morning all!,
> I am upgrading my transformer to a much bigger one and just want to
> run by you experts some questions! i have been running gecko 201's
> on my old transformer(18 vac/26vdc)with I suspect was not setup
> efficiently. I have now got a multi tapped large transformer which
I
> am going to use (34 v ac/47.6v dc). my motors are 34 Vexta 4.5
> amp .047 ohms ( 2 volt?) 8 wire series connected running three
axis.
> Can some one reassure me on
> a: the current set resistor value ,thinking 22k ?.
> b:the capacitor rating for the power supply ( i have read the white
> paper and still not sure)thinking 80 volt 80000mfd ?
> please help so i can go buy the bits as I want to do this correctly
> this time ( it worked fine last time but could it have been better?)
> thanks
> Mark