IPMC7616E-002 EMERSON DCS System High Voltage Inverter Series

Description

When the absolute value of the IPMC7616E-002 difference between target position and actual position

is greater that this value, the valve is considered to be in motion. Gain and reset values

are selected to cause rapid control action. When the difference is less than this value,

control action is softened.

When the absolute value of the difference between target position and actual position

is less than this value, the valve is considered to be IPMC7616E-002 stable. Gain and reset values are

selected to soften control action. When the difference is greater than this value, gain is

increased to yield sharper control.

When target valve position is equal IPMC7616E-002 to or less than this value, seating action controls the

output.

backSeatLimit

= 100.0

When the target valve position is equal to or greater than this value, backseating action

controls the output.

contingency =

5.0

If the absolute value of the difference between Valve Positioner target position and

actual position is greater than this value, then a contingency condition may exist. The

condition must exist until a timer expires for it to be reported. The timer is described

below.

A situation could arise where the Valve Positioner target position and the Controllers’

target are not equal. One example would be if the shutdown input was true, the Valve

Positioner set the target position to 0, but the Controller did not track. In this situation

contingency would not be reported if the valve went to 0% position

contingencyTi

me = 10000

If the error between target position and IPMC7616E-002 actual position exceeds contingency for this

amount of time, then the condition is reported to the Controller. This number is given

in milliseconds.

manualRate =

300

This value selects the magnitude of adjustment when target position is controlled by

the SLIM. This value is given in percent per minute.

bfpM = 1.0

Gain in the equation y = bfpM * x + bfpB

where

y = actual demand; x = demand written by the Controller

The purpose of this is to create staggered valve operation in the boiler feed-pump

application.

This value is normally set to 1.0.

bfpB = 0.0

Zero intercept in the IPMC7616E-002 equation y = bfpM * x + bfpB

where

y = actual demand; x = demand written by the Controller

The purpose of this is to create staggered valve operation in the boiler feed-pump

application.

This value is normally set to 0.0.

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