ABB EI803F 3BDH000017R1 controller module

ABB EI803F 3BDH000017R1 controller module

Technical data of product parameters

In any case EI803F 3BDH000017R1 , only the Primary VP or a pair can be calibrated. If you attempt to
calibrate with the terminal connected to the Backup VP, the VP will print a message
stating that the request is refused.
If you request a calibration of the Primary VP, and the Backup VP is also in service,
the Backup is calibrated unconditionally. During calibration, the Primary disables
the redundancy software state machine so failovers are eliminated.
The message packet exchange between the Primary and Backup VPs includes EI803F 3BDH000017R1
command/status bits related to calibration. The following table lists those
commands and descriptionsIn normal, local, and calibrate modes the Valve Positioner is always controlling
valve position. The PI routine runs unconditionally every 10 msec. Typically, it will
execute the PI equation as described below. The PI routine has some conditionally
executed parts to handle seating and backseatingSeating and backseating are important features of valve position control. The purpose of seating is to ensure that the hydraulic system is forcing the valve closed EI803F 3BDH000017R1
and admitting no steam into the turbine. Backseating is desirable because it can
affect efficiency, and because, for certain valve assemblies, a leakoff into other
steam systems are designed, assuming the valve is fully backseated.
The demand position from the Controller to the Valve Positioner is designed for a
range of -5% to 105% and resolution exceeding 13 bits. Seating is in effect when
the position demand is equal to or less than a programmable value, typically 0%,
and actual position feedback is less than 5%. When seating is in effect, the output EI803F 3BDH000017R1
is driven to the maximum possible value in the direction that closes the valve. A
timer is started. After 10 seconds, the output is reduced to 50% of the maximum
value in the direction that closes the valve. A similar limit and function is provided
for backseating.

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