Emerson A6220 9199-00009 EPRO DCS Control System Vibration Monitor Module

Description

PI Controller A6220 gain outside of deadband. This value is the higher of two gain values used in the

position PI loop. This value is used when the valve is moving. When the valve is in a stable

position, a lower value is used to avoid noise-induced control action.

The LVDT secondary feedback sum is multiplied by this value to achieve a voltage range

representing 0 to 100% position that is close to the input range of the A/D converter. The value is

printed as a raw decimal value. The hexadecimal equivalent is A6220 written to the feedback D/A

converter to adjust feedback gain. This value can be entered by the customer, but it is also modifified

automatically during the full calibration sequence. Feedback gain can be calculated by the

following formula:

gain = 4096 / D/A converter input word (decimal value)

When the A6220 absolute value of the 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.

errorDbS = 0.2 When the absolute value of the difference between target position and actual position is less than

this value, the valve is considered to be stable. Gain and reset values are selected to soften control

action. When the difference is greater than this value, gain is increased A6220 to yield sharper control

action.

seatLimit = 0.0 When target valve position is equal 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 =

10.0

If the absolute value of the difference between Servo Driver target position and actual position is

greater than this value, 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 Servo Driver target position and the Controller’s target are not

equal. One example would be A6220 if the shutdown input were true, the Servo Driver 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 actual position exceeds contingency for this amount of

time, then the condition is reported to the Controller. This number is given in milliseconds.

calhndrd =

30000

This value is displayed in decimal. It is the converted hexadecimal A/D converter reading for the

100% position. It can be entered by the customer; however, it is normally determined

automatically by the calibration sequence.

calzero =

-30000

This value is displayed in decimal. It is the converted A6220 hexadecimal A/D converter reading for the

0% position. It can be entered by the customer; however, it is normally determined automatically

by the calibration sequence.

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