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Comment by airbreather

Derivative is used in certain specific applicatiopns, eg boiler freedwater pumps, but generally, yes, avoid.

If you want good fast loop performance without overshoot don't forget the posicast.

Finally, PID loops are not everything, ask yourself "do I really need a setpoint that is maintained to 1% or better, or do I really just not want to overflow the tank?" If the latter, a ratio control can often be simpler, easier and most noteably not pass on as much process disturbance down the line leading to the plant settling out quicker.

parent airbreather 4 years ago

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