Flowserve ValveSight Diagnostics - Manual (Page 47)

ValveSight Diagnostics for HART User Manual FCD VSENSF0001-02-AQ 03/15
47 flowserve.com
Variable Range
The Low Limit and High Limit for a variable is shown in the respective fields. These show the criteria for the Range Validation
test.
12.2 LED
This screen is used to change the timing on the blink codes shown on the positioner. This can be useful to identify a
particular positioner.
LED Flash Control Variables
The LEDs blink in a sequence. The Time On box shows the time each LED will remain on. The Time Off shows the amount
of time between blinks. The Sequence Interval shows the amount of time between the beginning of one sequence of
blinks to the beginning of the next sequence of blinks. Select the
Default button to change all three values back to the
factory settings.
Data Management
Select Apply to save the selections to the positioner. Retrieve can be used to view values currently stored in the posi-
tioner.
12.3 Position Cutoff
This screen allows the user to change the position cutoff limits. Minimum Position Cutoff (MPC) mode is used to ensure
a fully open or fully closed position. Under normal operation, the positioner is balancing the pressure in the actuator to
maintain the position of the valve. When the commanded position moves past a position cutoff limit, the positioner will
engage all available force to move the valve to a fully closed or open position. One side of the actuator will be saturated
with full supply pressure while the other side will be left with no air/gas pressure. The status of this mode is displayed on
the Dashboard.