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CHAPTER 1 TEMPERATURE CONTROL MODULE
1
1.
4 PI
D
O
per
at
ion
1.4.5
Derivative action (D-action)
The derivative action adds the manipulated value (MV) proportional to the change rate to eliminate the deviation (E), if
any. The derivative action can prevent the controlled object from changing largely due to disturbance.
In the derivative action, the derivative time, TD, represents the time that the manipulated value (MV) of the derivative
action after the occurrence of deviation (E) becomes equal to that of the proportional action. The following table
describes the difference of actions depending on the value of derivative time, TD.
The following figure shows a derivative action under step response where the deviation (E) is a fixed value.
The derivative action is used as a PD action in combination with a proportional action, or a PID action in combination
with a proportional action and an integral action. The derivative action cannot be used by itself.
Condition
Integral action
TD is a small value
The derivative effect becomes smaller.
TD is a large value
The derivative effect becomes larger. However, a short period hunting is likely
to occur.
E
Manipulated value of the Proportional action
T
D
Time
Time
Deviation
(E)
Manipulated
value (MV)
K
P
• E
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