5 PID Control
Mk8 MM Manual Page | 122
5.3 Derivative Control
The Derivative term of the control system analyses the rate of change in the difference between the
measured and set point temperature or pressure. Derivative specific options are set in option 37, 38 and 39.
The time interval over which the compared and measured temperature or pressure values are taken is set in
option 37, the derivative dead-band or margin above and below the required set point in which no derivative
action occurs is set in option 38, and the response sensitivity as a percentage of firing rate increase or
decrease is defined in option 39.
Figure 5.3.i Derivative Control
NOTE: The derivative action occurs at all points outside of the deadband. This includes within the
proportional band.
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