Thanks Steve & Andy;
It was a NEWBE ATTACK.
Everything is brighter at sunrise.
Apparently I had tested a G96 S400 earlier in the day and
never did a G97. The Spindle was going for 400 FPS on a 1" shaft.
EMC remembers, even when I didn't want it to.
Thanks again
Don
PS. Andy I havn't given up on Motenc Velocity out, but I am pushed
about by Production needs. Will get with you when we catch up?
On Tue, Aug 10, 2010 at 5:48 AM, Andy Pugh <a...@andypugh.fsnet.co.uk>wrote:
> On 10 August 2010 05:42, Don Stanley <dstanley1...@gmail.com> wrote:
>
> > The Spindle gear selected is 230 RPM max, but the
> > spindle-rpm-cmd goes past that and is continually
> > trying to run the spindle faster and faster.
>
> What is your HAL setup for spindle speed control?
>
> If you are running closed-loop with a PID then I suspect you might be
> seeing the PWM going full negative in an attempt to slow the spindle
> below the max supported by the VFD. I have this problem as the VFD
> direction buttons are controlled by spindle-fwd and spindle-rev and
> ignore the direction output of the PWM. If you are over-speed with
> very low PWM, then the PID will switch to negative outputs, which
> actually gives an increasing PWM duty cycle, and eventually the PID
> goes to negative max, which gives full PWM, full speed, and a vain,
> ignored, PWM direction signal.
>
> If this is your problem, then the solution is probably to use comp and
> mux2 HAL functions to to connect the PWM input value to zero when the
> PID output is negative. (I don't think you really want to reverse the
> spindle VFD if the spindle is running faster than requested)
>
> [FEATURE REQUEST] A negative limit so that we can have unipolar PID
> would be nice.
>
> --
> atp
>
>
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