Re: G-320 Servo current setup

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