Re: Hot servo motor

Follow-up on Hot Servo...

Y axis servo running hot but functioning. Thought I would re-tweak
the Kp Ki Kd...set all values to zero to retune. Zzzapp! Fried
the Y axis driver ... actually went up in flames. Checked servo ...
2.2 ohms on windings per spec sheet and when motor moved by hand,
stays at 2.2 ohms ... didn't find any shorts. Exchanged
driver...reconnected...Paff! goes another board. Needless to say the
servo motor is now history. Checking with Rutex to see if boards
repairable. Other axes work fine. What's the moral to this story?

Regards ... rfs.

> That is a good thought. Will check. However, the servo gets hot
> just idling (no movement). The Y axis seems to run smoothly

without

> apparent binding by the hand wheel (servos off). I will be swapping
> drivers to the board to see what happens...maybe scope the motor
> outputs.
> Regards...Richard in Michigan.
>
> > If the Y gib adjustment is too tight then there would be more

load

> on
> > that motor causing higher current draw and heat on that axis. The
> > servo driver should deliver as much as needed under load, even
> > sometimes at the expense of the motor (or driver).
> > Regards
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "k8zre" <rfs@c...> wrote:
> > > Hmmmmm....make that a pitcher of rootbeer, please. The hot
> servo
> > > axis is Y. All of the drivers and all of the servos are
> identical.
> > > I will swap and see what happens. Thanx for the suggestions.
> > > (Using MACH2(exciting) with Campbell breakout board (nice).)
> > > Best Regards...Richard in Michigan.
> > >