Technical Specifications

ValVueFF Software Interface to FVP
76
GE Energy
Near Closed Value
(%)
The threshold below which the valve is considered near closed.
Near Closed is useful for estimating when to change the valve
trim. This value does not effect valve travel it is used only for
reporting the time that valve is near the seat.
Limit Switch
Threshold
The limit switch thresholds apply to the Discrete Input Block (DI)
Set Points.
❑ Threshold Low -Threshold for low limit switch that is
communicated by the Discrete Input Block (DI).
❑ Threshold High -The threshold for the high limit switch that
is communicated by the Discrete Input Block (DI).
NOTE When Tight Shutoff Below is configured to a positive value
small flows are not controllable.
When Full Open Above is configured to a value of less than
100% large flows are not controllable. At the configured Full
Open Above setting the flow jumps to the greatest possible
value.
Fault Control
❑ Error Band - The position deviation limit to start deviation
timer of Time 1 and Time 2.
❑ Time 1 - Position deviation time limit to show the block
alarm. A negative value turns off this function.
❑ Time 2 - Position deviation time limit to trigger the failsafe
action. Enter -1 to disable the function. A negative value
turns off this function. Using Time 2 failsafe can result in
unwanted process shutdowns.
CAUTION Use the Time 2 failsafe only for a critical process that must be
forced to its failsafe position if the valve is unable to respond
to its position setpoint after a reasonable time delay. Do not
set the error band to a value that is too small. If time 2 is used
it must be longer than the valve stroking time. TIme 2 value
that is too small results in nuisance failsafe behaviour