Technical Specifications

ValVueFF Software Interface to FVP
96
GE Energy
Options
The Options tab (Figure 82) contains configurations of other settings including
characterization, pressure range and units, bumpless transfer, display language, and
temperature units.
Figure 82 Options Tab-Configuration Dialog Box
Characterization Frame
The positioner is supplied with a choice of characteristics that modify the characteristic
built into the plug and actuator. Choose a characteristic that works with the control valve's
inherent characteristic to provide a desired overall installed characteristic. Avoid the
common mistake of choosing an Equal Percent characteristic in the positioner if the valve
has an Equal Percent characteristic built into the plug. Table 9 lists guidelines for
configuring the valve characteristic. Use of a linear characteristic is recommended unless
the process dynamics or control valve application calls for an alternate characteristic.
The FVP positioner provides typical characteristics of linear, equal percentage, and quick
opening as well as a user-adjustable customer characterizer. Base the choice of
positioner characteristics on overall particular loop characteristics.
Linear The valve position is proportional to the input to the FVP posi-
tioner.