GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual page 235

NOTE
For each alert the SVI FF provides an Alert Counter – a counter indicating how many times the
alert happened in the past.
Deviation
Deviation alert is set if the error between the set point and actual position is bigger that the
alert limit for the time defined in the alert configuration.
Deviation error can be caused by high valve friction, improper valve tuning, an obstacle in the
valve movement, valve stops (e.g. valve seat is reached), supply pressure, etc.
Position
A position alert is set if the actual valve position is out of the expected alert limit. The alert is
cleared when the position is within the limits again (including Dead Band).
The position alert is used to detect if the valve is in a Tight Open or Tight Close condition, to
detect position sensor slippage or valve plug wear.
If the alert is set to detect a Tight Open or Tight Close condition, the alert count is used to
understand how many times the Tight Open or Tight Close was activated.
SVI FF allows configuration of the following position alerts:
HI HI
HI
LO
LO LO
Some examples of what can cause this are:
Calibration issues
Linkage drift
Drift issues related to valve wear
Incorrect valve size
© 2019 Baker Hughes, a GE company, LLC. All rights reserved.
In the Transducer block each alert has an Active and Historical bit.
Active bit presents the current state of the condition. Historical bit
indicates whether the condition occurred in the past. Both are
user clearable.
Masoneilan SVI FF Instruction Manual
| 235
=