Flowserve Logix MD+ ValveSight - Manual (Page 239)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
239
Position Shutoff
The Position Shutoff page allows you to change the position shutoff limits. Tight Shutoff
(also called Minimum Position Cutoff or 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 shutoff 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 pressure. The status of this mode is
displayed on the Dashboard.
Status Area
The Active Indicator area shows the status of the most relevant active indicator. The color
of the "LED light" corresponds to the Active Indicator and the first color of the blink code
sequence on the positioner. Generally green indicates no immediate issues. Yellow
indicates a developing issue. Red indicates the ability to control may be compromised. A
detailed list of the indicators is given in the
Alarm Congfiguraion - Alarm Annunicator page.
The Command Source field indicates weather the positioner is being controlled by digital or
an analog (4-20 mA) command source.
Upper Position Shutoff Setting
The "Upper Position Shutoff Setting" box shows the input command signal above which the
positioner applies full force to open the valve. The default value is 110%.
Lower Position Shutoff Setting
The "Lower Position Shutoff Setting" box shows the input command signal below which the
positioner applies full force to close the valve. The default value is 1%