Re: FS: New 4 axis microstepping driver $45.00 USD

Not true. The regulator output will climb to 1 diode drop above the
filter cap voltage. The cap voltage will climb above its normal
voltage as it absorbs the regenerated voltage.

What saves everything is if there are 2 or more drives connected to a
single supply. Then the other drives absorb the returned current from
the stalling motor, taking a little load off of the supply for the
duration of the event.

Moral of the story: Run 2 or more drives from a common supply, have
all motors stopped before turning off the power supply.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
<rtellason@b...> wrote:

> On Monday 22 March 2004 10:41 pm, Mariss Freimanis wrote:
> > I think regulating the power supply does not address the bigger
> > problem of returned energy and in fact, will make it much worse.

>
> That's why, whenever I build something that has a regulator in

there, I

> always put a couple of diodes in place, mostly to protect the

regulator.

> One goes across the output, but so that it's reverse-biased. The

other goes

> across the regulator, likewise normally reverse-biased, cathode

connected

> to the filter cap and anode connected to the output. In a scenario

like the

> one you describe this diode goes into conduction and the excess

energy gets

> dumped into the filter cap. The output voltage never goes any

higher than

> one diode drop above the regulated output voltage...