Re: PID setting in EMC

Two of my G340 (actually G320 with the pulse multiplying board added
inside) are about 1 year old. The other G340 was purchased last week.

Perhaps it is because my encoder count is so high (10000
counts/rev). Although I would think this would make things
smoother...

Richard

--- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote:
> The uneven pulses from steppermod.o are not an issue at all with the
> G320/G340 drives. They are only a concern if you are using a
stepper drive
> that does not generate their own smooth pulse train (so all
steppers except
> G210 and even the G210 can be affected if running other than the
10x pulse
> multiply mode).
>
> I am using very large servo motors with my G320 drives (roughly
NEMA 42
> sized) and my setting are about mid scale on the dampening and gain
and wide
> open on the current. How old are your G340 drives? The newer ones
have an
> anti-dither circuit that keeps them quiet at rest. On the older
drives they
> would sit and dither fairly rapidly with quite a buzz at rest when
set
> correctly.
>
> Tim
> [Denver, CO]
>
>
> > I am also using the Gecko G340 drive with some rather large
servos. I
> have only tried steppermod so far, and it seems to work ok. I
agree that
> there may be some issue with uneven pulse trains.
> > On a side note about the Gecko G340 and larger motors, where do
you have
> your gain and damping pots set to? My motors go into bad
vibrations unless
> I have the gain set very low, with the damping set just above it. I
> understand why you would get vibrations or oscillations if the
drive was
> underdamped, but I also get it when it is overdamped. Is having
the gain
> pot set to almost minimum ok?
> > Richard