YOKOGAWA UT55A - Switching PID According to Target SP

8-94
IM 05P01C31-01EN
8.4.4 SwitchingPIDAccordingtoTargetSP
Description
ThezonePIDselectionbytargetSPswitchesbetween
thegroupsofPIDparameters
according to the target SP.
The figure below shows the example of switching the group of PID parameters according
to the target SP. Itshowsan
exampleofdividingthePVinputrangefromthemaximum
valuetotheminimumvalueintofivezonesbyreferencepoints1to4.(SetRP1toRP4.)
SP
250ºC
100ºC
350ºC
800ºC
Target SP is
changed from
100ºC to 350ºC
Target SP is
changed from
350ºC to 250ºC
Target SP is
changed from
250ºC to 800ºC
Reference point 4
(PID of group 5)
(PID of group 4)
(PID of group 3)
(PID of group 2)
(PID of group 1)
Time
PID of group 1 PID of group 3 PID of group 2 PID of group 5
Reference point 3
Target SP
Current SP
Reference point 2
Reference point 1
Maximum value of
PV input range
Minimum value of
PV input range
PID No. to be selected
ThePVinputrangecanbedividedintothenumberofzonesthatissetinthereference
point.
Reference deviation can be set at the same time.
► Reference deviation: 8.4.5 Switching PID according to Deviation (Reference Deviation)
8.4SwitchingPID