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Signature Measurement Functions
Diagnostics
Signature Measurement Functions
Acquisition of detailed data is essential to ensure that changes in valve’s characteristics
are captured and on-target maintenance is performed. The signature functions
measure the input-to-position characteristics of the valve, and the input-to-position
characteristics and step response of the positioner while off-line. As for a valve’s
input-to-position characteristics, a function of performing in-detail measurement is
provided to enable capture of miniscule changes.
Nevertheless, since a vast amount of measured data cannot be stored in the limited
memory of the positioner and most of the data is lost in the event of a power failure,
upload measured data from a host as necessary.
Further, the data uploaded must be processed for analysis. These requirements make it
difficult to use a general-purpose tool or application for these tasks.
ValVueFF (R2.20 or later) FVP management software, an FVP-specific tool is designed
to perform these tasks with ease and offers dedicated functions. ValVueFF facilitates
executions of signature measurement, uploads of measured data, display of measured
data in a graph, and comparisons of measured data with previously measured data.
This User’s Manual outlines the contents of each type of signature and explains the
signature-pertaining parameters in the transducer block. For instructions on performing
signature measurement, see the User’s Manual for ValVueFF (EW1000-FF), which
explains its functions and operation procedures.
Signature Measurement Procedure
The fundamental procedure for measuring signatures is as follows.
1. Set the measurement conditions for the signature(s) for measurement ( “Signatures
and Relevant Parameters” on page 172).
2. Set the value of MODE_BLK target in both the transducer and AO blocks to O/S.
3. Set SIGN_MEAS_EXEC to select the signature(s) for measurement and carry out
the measurement. SIGN_MEAS_EXEC:
1 Off
2 Measure All (executing 3, 4, 6, 7)
3 Measure Standard Actuator Signature
4 Measure Extended Actuator Signature
5 Measure High Resolution Actuator Signature
6 Measure Step Response Test
7 Measure Positioner Signature
255 Cancel Execution
4. Set SIGN_UPLOAD_DATABASE to select the data to upload, and upload the
values of SIGN_DATA_X and SIGN_DATA_Y. SIGN_UPLOAD_DATABASE:
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