Re: Best way to mount Gecko modules ?

Yes higher voltage is better, think of an industrial plant they use
440v machinery, this helps with the voltage drops on long runs from
the mains and saves on the size of the copper wire needed.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Les Watts" <leswatts@a...>
wrote:

> I recently developed a little circuit that monitors servo voltages,
> currents, and speed. It just uses op amps to solve the second
> order differential equations of motion to real time calculate
> spindle force.
>
> So I spent some time watching currents on the scope as the
> machine runs.
>
> I routinely see 60 amps peaks going around sharp corners and
> starting and stopping from rapids.
>
> The average total current with typical cutting is about 10-15 amps.
>
> This is with a xyz gantry machine using three Copley 412 amps
> which are similar in power to the Geckos. The amps are heat
> sinked (sunk?) and forced air cooled.
>
> Mariss had suggested to me that 240v operation would be
> preferrable and I agree. It is much stiffer than the average
> 120v 15a circuit and there are no worries about floating
> neutrals. Georgia power was nice enough to float my
> neutral last year and I really apreciated seeing 240 on
> my 120v outlets. Thank god the cnc was not on one.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
> Surplus cnc for sale:
> http://www.alltel.net/~leswatts/forsale.html
> > Les had mentioned in an earlier message about using 220v instead

of 110v

> > for more stability in the higher current ranges. With all three

of Les's

> > Motors moving at one time I can see the total current draw being

pretty

> > high at times. So, would it be advisable to go that direction,

or survive

> > in the 110v range??? (pun intended)
> >
> > Thanks for any info on these!
> >
> > Vince
> >
> >