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what is reset windup in integral control?
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Answer Posted / www.islamqa.com
"Reset windup" is a controller problem that occure when
there's an upnormal load disturbance, which make Pv away
from Sp although the controller is 100% o/p!!
in this case the controller will continue to integrate the
error signal upward, so we can say we have "reset wind
up ", and the valve (or final control element) is taking
its extreme position - up to this we have no problem.
# The problem starts when the unusual disturbance is away
and the controller extreme o/p will have an effect on the
Pv which now on it's way to equal Sp.
The problem now is that the controller seems like to
saturate at 100% due to time spent "winding up", Now we may
have Pv=Sp and the controller remain saturated at 100% o/p,
it will take a long time before the controller start to
downward its o/p value.
# Modern PID has "anti reset wind up" feature, which may
contain an algorithm to turn off the integral term in case
of error is exceed a specific value, or any other algorithm
to stop integral accumulation in case of winding up.
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
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