Technical Specifications

ValVueFF Software Interface to FVP
162
GE Energy
Figure 144 Result Analysis - Resolution
Positioner Signature
This signature function measures the static characteristics of the control valve system.
The application applies the Input signal to the FVP and waits until the valve stem settles
then obtain the position data. The measurement is proceeded in the round trip.
Input signal of the control valve system: Input signal of FVP (Equal to AO Block
OUT.Value) Output signal of control valve system: Feedback signal of ValVueFF (Equal to
FINAL_POSITION_VALUE.Value) The Low Cut, High Cut, Position Characterization and
other functions related to Positioning in Transducer block are reflected in measuring
Positioner signature. This helps the user to check the setting of FVP visually.
Measurement Setting Parameters
The measurement setting parameters consist of five float arrays (Figure 145):
❑ Lower Set Point Signal (-10 to 110%) - Determines input signal to start the
measurement.
❑ Higher Set Point Signal (-10 to 110%) - Determines the highest input signal in the
measurement.
❑ Intervals (4 to 20 points) - Determines the measurement points of this signature
function. Width of measurement point is determined in equation:
Width = (Higher Set point signal - Lower Set point signal)/Intervals Total Sample
points (collected in round trip)=2*Intervals+1
❑ Recommended Wait Time(s) - It can be used as a guide for setting wait time (read
only).
❑ Wait Time (5 to 300 sec) - Determines the data acquisition que time for each
measurement.