Characteristics of derivative control mode

The summary of characteristics of derivative control mode are as follows:

  1. If the error is zero, the mode provides no output.

  2. If the error is constant in time, the mode provides no output

  3. If the error is changing with time, the mode contributes an output of KD percent for every 1% per second rate of change of error.

  4. For direct action, positive rate of change of error produces a positive derivative mode output.

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