What is the role of P(Protional), I(Integral) and D
(Derivative) in PID Controller?
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Answer Posted / arulnainar
1.P(Proportional): to calculate the error signal (Error
signal means the difference between Process variable(PV)and
Setpoint.(E=SP-PV)-- Present(Howmuch)
2.I(Integral): to remove the offset error. It will decide
howlong the error exist in the cycle.(Iitegral time in RPM
or MPR)--Past(HowLong)
3.D(derivative): It will decide how fast the control action
to remove the error without any overshooting or
undershooting in the process for future cycle.
For practically we can say Howmuch(present), Howlong(Past),
Howfast(Future) respectively P,I,& D.
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