Re: G-320 Servo current setup

Thanks Mariss,

I'm thinking I can hang a LED panel meter on one to watch current, no
need for the 'scope Amp probe, if the current stays steady. Or is that
just for the servos? Even if not, then I can hang two 10:1 'scope
probes, and observe more then one motor/winding at a time. I DON'T want
to buy another 'scope Amp probe! $$$

On another subject, I just picked up four (4) "Centent CN0142
Anti-Resonance MicroStep Drives" from surplus, made in Santa Ana, CA!
Humm, I wonder where I've heard that address before? ;>)

I'm anxious to get them connected up! They must be four times as big as
a Gecko, with similar current ratings and connections. only 60V, 'tho.
10 uSteps/Step. Any tips, considerations?

Alan KM6VV

mariss92705 wrote:

>
> Alan,
>
> The G201 has a pair of 0.05 ohm sense resistors, one per phase. They
> are 3W non-inductive. The choice of resistor value is based on it
> dissipating near rated power at max current (7^2 * .05 = 2.5W). That
> works out to 20^2 * 0.01 = 4W for the G320, but unlike the G201, it
> will not spend a lot of time at 20A so it is a safe value.
>
> The resistor's power rating is based on full lead length. In our case
> the leads are vey short and are heat-sunk to a ground plane equal to
> the size of the entire board. This easily adds another 1W to the safe
> dissipation.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> > Hi Mariss,
> >
> > Is there a similar current sense resistor in the G201's? 0.01 ohm?
> >
> > Alan KM6VV
> >
> >
> > mariss92705 wrote:
> > >
> > > Bill,
> > >
> > > You can put a battery operated multimeter set to DC Amps in series
> > > with your motor if you are looking to read fairly steady currents.
> > > Your current probe will be very accurate as well.
> > >
> > > If you need to read rapidly changing currents then you need an
> > > oscilliscope to read the voltage across the 0.01 ohm current sense
> > > resistor inside the drive. The scale is 1A = 10mV.
> > >
> > > Mariss