EMERSON 1C31227G01 controller

EMERSON 1C31227G01 controller

Technical data of product parameters

Two Ovation Valve Positioner (VP) cards (Primary and Backup) operate as a
Primary backup pair to control a single steam valve (see Figure 25-1). The steam 1C31227G01 19-01-21
valve is fitted with two LVDTs, one connected to each Valve Positioner. Each VP
then drives one coil in a high pressure hydraulic servo valve. The coils are
completely isolated.
The Valve Positioners communicate serially to determine which VP should be
Primary, and which should be Backup. Critical parameters of the redundant
subsystem are exchanged over the serial link. These critical parameters are also
exchanged over the Ovation bus, thus providing a redundant data path.
The Backup VP suspends its software PI routine, and replicates the servo output of
the Primary. It then takes over control if the Primary fails. There are three types of 1C31227G01 19-01-21
failures that the subsystem will detect and respondFailover events are NOT bumpless (that is, the valve will dip, or move in the
direction indicated by the mechanical bias setting, during the failover period).
Catastrophic hardware failures, or removal of the Primary VP, are the worst failures
because the Backup must wait for various timers to expire and then engage the PI
loop.
If, for example, the failover required one second to complete (determined by the 1C31227G01 19-01-21
Controller loop time for example), and the valve was programmed to drift shut in
30 seconds under control of the mechanical bias-setting, the valve could driftFirst, the linear range of the LVDT must exceed the mechanical range. This
means that when the valve is at either endpoint, one of the secondary voltages
will be at its minimum. The secondary voltage must be large enough at the
endpoint so that if a wire breaks and the secondary voltage goes to zero, the
change of voltage will be large enough to be readily detected. A good guideline
is to ensure that each secondary always contributes at least 10%, positive or
negative, to the demodulated voltage. That is,

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