Re: [CAD_CAM_EDM_DRO] Mariss? Dan M? Re: Bill W's question?

Peter Seddon wrote:

> The health and safety people would expect power to be removed from the
> drives under e-stop as it could be a runaway that caused the problem. Would
> this potentially destroy the drive - possibly it would lock the slide
> assembly.

Although I can't answer for Mariss' Gecko drives (either stepper or servo)
or any other drive in particular, they all pretty much use similar full-bridge
topology, as my own servo amps do. I came up with a circuit that ramps
power to the servo amps slowly (so as not to trip the high-side current
sensing circuit) and also extracts energy from the motors, if the machine was
in motion when e-stop was activated.

See the 2nd schematic in http://pico-systems.com/EMC.html for this circuit.

Jon