YOKOGAWA UTAdvanced UT55A, User Manual

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IM 05P01C31-01EN
Introduction to Functions
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1.3 Control Functions
Two-position Two-level Control
Two-position two-level control has two target setpoints to control ON and OFF
respectively.
► 8.2.4 Two-position Two-level Control
OFF
ON
Output
PV
Main SP
Initial value: Reverse
Hysteresis Hysteresis
Sub-SP
Initial value: Direct
(offset from main SP)
Sample PI Control
Sample PI control is useful for processes with long dead times where the results of the
control output are not quickly reflected on the PV.
► 8.2.6 Sample PI Control
Batch PID Control
Batch PID control is useful for cases where control is performed causing the PV to settle
to a SP as quickly as possible without overshooting.
► 8.2.7 Batch PID Control
Feedforward Control
Feedforward control cancels the disturbance before the effects of the disturbance appear
in the controlled system by applying a signal – to correct for the disturbance – directly to
the controller.
► 8.2.8 Feedforward Control