Masoneilan SVI II ESD, Installation And Maintenance Manual

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Masoneilan SVI II ESD Installation and Maintenance Manual =
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Sig Hi In the SVI II ESD configuration, the input current setting at which a
valve is fully open (ATO) or fully closed (ATC).
Sig Lo In the SVI II ESD configuration, the input current setting at which a
valve is fully closed (ATO) or fully open (ATC).
Single Acting The action of a positioner with a single pneumatic output to operate
with a spring return actuator.
Split Range A control configuration where a single control output is sent to two
or more control valves. Each control valve positioner is calibrated to
respond to a separate portion of the control signal. An example is a
steam valve and a cooling water valve arranged to be both closed at
50% and the steam valve to open.
STOPS SVI II ESD runs STOPS procedure to adjust the positioner to actual
valve travel. First, output pressure is reduced to zero and position is
recorded. That is the position corresponding to 0%. Then output
pressure is raised to its maximum based on supply pressure. The
position is recorded and corresponds to 100%.
Stroke The total range of valve travel (An accumulated value of 100% travel
= 1 stroke. The travel does not need to occur in one movement).
Often used as a verb to describe the process of moving the valve.
Tag The formal designator the control valve used in control loop docu-
mentation.
Tight Shutoff (TS) A positioner property that is selected and adjusted when it is desired
to prevent valve operation at or near the closed position. The posi-
tioner causes all available actuator force to be applied to the valve
seat at a position set point equal to or less than the TS adjustable
parameter. A dead band is applied to prevent cycling in and out of
this behavior.
ValVue ESD BHGE’s software for calibration, configuration, diagnostics, and PST
setup that is provided, on a trial basis with every SVI II ESD.
VDE ⁄ VDI 3845 A standard common in Europe for mounting positioners and acces-
sories on rotary valve actuators.
VIEW DATA A positioner mode of operation in which configuration and calibra-
tion parameters can been examined, either remotely or with local
display.
VIEW ERR A positioner mode of operation in which the error status or error
messages can be examined.