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why the derivative in PID is always set to zero?

Answer Posted / abhijt n. sonar

Derivative gain is used to take the preventive action in
control. i.e. it gives the corrective action for future
based on the nature of present error. And Derivative action
is used to fast the porcess.
Due to this property of Derivative gain, the process may
become fast and unstable. To avoid this, generally
Derivative gain is kept as minimum as possible i.e. zero.

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