Re: BP retrofit yaxis drive burnup- follow-up

> it is a pretty general device. It has a 56 A MOSFET transistor,

> charge pump circuit that gradually charges a capacitor, ramping the
> voltage to the motor drives up at a steady rate.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> Keith Clark wrote:
>
> >Jon,
> >
> >Can you enlighten us about the ramp-up module? This might
certainly
> >help me avoid more damage to the Geckos during estop now that I
have
> >a fully functional machine.
> >
> >
> Sure, see http://jelinux.pico-systems.com/pwmsw.html
>
> This was designed for my PWM servo amplifiers and PWM controller,
but
> it is a pretty general device. It has a 56 A MOSFET transistor,
and an
> charge pump circuit that gradually charges a capacitor, ramping the
> voltage to the motor drives up at a steady rate. When the power on
signal
> is turned off, it activates a braking resistor that removes all
energy from
> possibly still spinning motors.
>
> It has 3 power connections : Gnd, DC power in and DC power out.
> It has one control signal, Power On NOT. IE. this signal is
grounded
> to power the drives on. It requires 5 V DC from some external
source.
> The Power On NOT signal is not opto-isolated.
>
> Jon