TE Technology TC-24-25 - Manual (Page 21)

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Example: The system’s period of oscillation with the appropriately set Proportional Bandwith was 75
seconds. Therefore, the suggested Integral Gain is
Integral Gain = 1/(2 x 1.25 minutes) = 0.4 repeats/minute.
For slower response but better stability, reduce the Integral Gain.
DERIVATE GAIN senses the rate of change of the temperature and allows the controller to anticipate
the power needed to compensate for rapid changes in system loading. This term is generally used only on
very sluggish systems or where very quick response is necessary. The acceptable range for the TC-24-25
is 0.1 to 10 cycles per minute.
To determine an appropriate derivate rate, use the following formula:
Derivate Gain = Integral Gain/10.
Continuing the above example, the Derivate Gain would be 0.04 cycles per minute.
NOTE: DERIVATIVE GAIN is difficult to apply and often causes more trouble than it is worth. If you
are not experienced in process control, you may be better off leaving the DERIVATIVE GAIN at zero.