YOKOGAWA Centum-XL User Manual

4. Procedure and Details of Upgrade
4-13
TI 33K01B10-50E
4.5.3 Handling Tuning Parameters
Tuning parameter resetting may be required between the existing CENTUM V or CENTUM-XL
and the CENTUM VP system. For tuning parameter differences between the existing systems
and CENTUM VP, refer to Appendix 3, “Tuning Parameter Differences.”
Items to Be Specially Noted
• Two-itemdatachangedtoone-itemdata
Example:Integratedvalue(K2,K3→SUM),batchsetvalue(K8*K9→BSET)
• Normalizeddatachangedtoengineeringunitdata
Example: Y-axis of 7PG (PG-L13), X-axis and Y-axis of 7CM-NL (FUNC-VAR), ratio, gain
and feedforward gain of 7RS (RATIO)
• Changedalgorithm
Example: Derivative term D of PID
IMPORTANT
CENTUM VP’s PID function block tends to output its Derivative time calculation value larger,
in a short period of time, than CENTUM V or CENUM-XL. It means that CENTUM VP is more
responsive to the increase and decrease of an input value or a set point value that are identical.
Therefore, when CENTUM V or CENTUM-XL is upgraded to CENTUM VP, reviews of the PID
parameters per loop are required. When a Derivative term is 0, the existing Proportional term and
Integral term can be directly applicable. In case the Derivative term is something other than 0,
considerations to the following points are required. For more details, please contact Yokogawa.
• DerivativetermsofCENTUMVorCENTUM-XL,inmostcases,canbedirectlyappliedto
the loops where those values have only little effects.
• OntheloopswhereDerivativetermshavebiginuence,retuningofthePIDparametersis
required.
• InputnoisesmaycauseoutputstouctuatewhentheDerivativetermsarebig.Byusingan
inputlter,theoutputuctuationcanbecontrolled.
• WhenthePIDactionsofCENTUMVorCENTUM-XLhavetobeinherited,equivalentPID
actions of the existing system can be achieved by using the CENTUM VP’s applications
such as CALCU blocks of FCS.
Mar. 27, 2015-00

YOKOGAWA Centum-XL Specifications

General

Brand	YOKOGAWA
Model	Centum-XL
Category	Industrial Equipment
Language	English