Technical Specifications

151
Extended Actuator Signature
Diagnostic Services
Extended Actuator Signature
This measures the in-out characteristics of the control valve in the user-defined range.
The total number of data is 100 sets (Figure 129).
The input parameter is output pressure (Equal to MEAS_PRESS_AIR); and the output
parameter is the feedback signal (Equal to FINAL_POSITION_VALUE.Value).
Before measuring the extended actuator signature, FVP performs an offset
measurement, the same procedure as the one in Auto Tune. This prepares for the
measurement if the selected measuring mode is not set to Measure All.
In measuring the extended actuator signature, FVP obtains 100 data sets. Position data
and pressure data is one set. There are two data acquisition modes: Position related
data acquisition and time sampling related data acquisition. Normally, data is acquired
according to the addressed measuring position point. When the valve is saturated and
cannot reach the measurement point, the data acquisition mode is switched to time
sampling.
Figure 129 Extended Signature Dialog Box
Measurement Parameters
The measurement setting parameters determine the condition of measurement. The
parameters consist of six float arrays. This group of parameters is shared with High
Resolution Actuator signature.
Lower Set Point: Lower measuring range; valid range is -10 to 110%.
Higher Set Point Higher measuring range; valid range is -10 to 110%.