Chapter 7. Usage of Various Functions
7-22
Fig. 2.5 The system response when a long integration time given
Fig. 7.4 The system response when a long integration time given
Fig. 2.6 The system response when a short integration time given
Fig. 7.5 The system response when a short integration time given
(c) Derivative operation (D action)
①
When a deviation occurs due to alteration of SV or external disturbances, D action restrains the changes of the
deviation by producing MV which is proportioned with the change velocity (a velocity whose deviation changes at
every constant interval) in order to eliminate the deviation.
②
D action gives quick response to control action and has an effect to reduce swiftly the deviation by applying a large
control action (in the direction that the deviation will be eliminated) at the earlier time that the deviation occurs.
③
D action can prevent the large changes of control object due to external conditions.
④
The period of time from when the deviation has occurred to when the MV of D action become the MV of P action is
called derivative time and represented as Td.
Содержание GLOFA G7M-DR20U
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Страница 159: ...Chapter 7 Usage of Various Functions 7 52 c Program...
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Страница 253: ...Chapter 8 Communication Functions 8 27 b When uses Ch 1 Built in RS 485...
Страница 355: ...Appendix 1 System Definitions App1 8 5 PID parameters 1 PID Auto Tuning Parameter 2 PID Parameter...
Страница 356: ...Appendix 1 System Definitions App1 9 6 Position Parameter...
Страница 357: ...Appendix 1 System Definitions App1 10 7 High Speed Counter Parameter...