Answer Posted / narayan
PID means Proportional , integral and derivative
these are actions of controller
Proportional controller- output is function of change in error. i mean change in error * gain
Small proportional band means High gain, minimal offset and possible cycling
Large PB means low gain, large offset and stable loop
Integral- this action which will be a function of deviation of error. As long as the error exists, the output will continue to change, is expressed in repeats/minute. Adding this action , adds one more gain component in the loop. The faster the action, the greater the gain.
It is nothing but afunction of magnitude and duration of error.
Fast integral- means High gain, Fast return to setpoint and possibly cycling
slow integral- low gain, slow return to setpoint, and stable loop.
Derivative action is a function of a speed of change in error.this action generate a corrective action immediately when the error starts changing and size eual to , P-mode would have generates.
This action makes a change equal to the proportional change 2 minutes before proportional only would have made the same change.
Fast rate= increase in gain, many cycles
Gain=100/Proportional Band
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