> I noticed this after the heater had maxed out at 200
> Watts, so I changed the PID max to 400 Watts. The heater immediately
> jumped to over 600 Watts and continued rising. I quickly
> turned off the heater, or target damage would have resulted, but I was
> really startled by the heater behavior. Has anyone seen this behavior
before,
> i.e. when the PID control maxes out it overcompensates when it come back?
I suggest your look at the EPID record, which has provisions for limits on
the output
http://millenia.cars.aps.anl.gov/software/epidRecord.html
Mark Rivers
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