Re: lost steps

Hmmmmmm.
The motors do not have voltage or amperage on the nameplates. The
nameplates say, MAE Motori Apparacchiature, HY200 3437 400 A8, 4fasi
4A faso, 85 (omega).
I gave the nameplate info to Dan and he said that they are nice
motors
with an amp rating of 2.86 I think and I set the the Vref according
to
his formula at half that number in volts, 1.4 on each side of the
board.
Dan also gave me the wire connections and I think they are series
connected.

If I wanted to try reducing the voltage to the motors, how would I do
that?

Jerry

--- In CAD_CAM_EDM_DRO@egroups.com, ballendo@y... wrote:
> Jerry,
>
> Can't believe no ones mentioned this before. (even I missed it in
my
> long post)
>
> What CURRENT are the drivers set to!?
> What VOLTAGE are the motors rated for?
> What CONNECTION (series or parallel) are you using in the motors?
>
> You may be saturating the windings of your motors. This would act a
> lot like an interference problem, and since you have mentioned the
> BARE motor shaft rotation, I should have caught this earlier. The
> effect(s) of oversatuturation is more noticeable on lightly loaded
> motors.
>
> Steppers are a spring-damped system, and work best with a load on
the
> shaft,it damps the "ringing" at the end of each step. This is also
> why half-stepping often works better; the distance moved is
shorter,
> so there is less "ring".
>
> When motors are over-driven (usually in the interest of "more
> torque,please") their behavior becomes erratic. They can get too
hot
> and if run this way too long, become LESS powerful as the magnets
are
> destroyed in the process!
>
> Try reducing the current output to the motors! Next try using a
lower
> voltage supply. I know you are using 37V from your reply to my
post;
> this SHOULD be ok (for most motors), but when you're in the middle
of
> an alligator filled swamp, you do things you wouldn't NORMALLY do.
>
> Mariss in an earlier post told what factor the voltage can be
> increased to (above the nameplate rating) Are you beyond this at
37V?
>
> Sorry I missed this before. Good luck!
>
> Ballendo