Valve/Actuator Diagnostics - GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual

Valve Control
Problems detected with valve control are reported in this group. If the actual position cannot
be driven to follow the setpoint, a valve control failure is reported. There may be multiple
reasons for this failure:
Problem with the supply pressure
Obstacle in the valve movement, etc.
Commissioning
This problem is reported if the positioner has not been calibrated. The Find Stops procedure
must be executed to clear the problem. If the positioner is shipped installed on the valve, it is
factory calibrated and this problem won't occur.
Air Supply
This problem is reported if the supply pressure is out of the spec (most likely too low).
Supporting Hardware
This problem is reported if a failure in one of the supporting accessories is detected:
Local LCD display
Remote Position Sensor, etc.

Valve/Actuator Diagnostics

The SVI FF positioner collects information from multiple sensors. This information is used to
evaluate the quality of valve and actuator control and the working conditions.
Valves and applications may have significant differences in the expected behavior – e.g. small
valves usually are fast and are able to reduce the error between the setpoint and actual
position within seconds. Valve wear may be significantly impacted by the content and
temperature of the fluid being processed or by the material used to make the valve.
To adjust to the variety of applications, SVI FF positioners provide a set of parameters, which
can be modified to adjust to the specifics of the process being controlled. Adjustable alert
points and dead bands (where applicable) are provided for the monitored parameters and can
be modified from default settings to reflect the specifics of the application.
An alert is set when the monitored value crosses the point defined by the Alert Point and stays
active until the alert is cleared or the monitored value is restored to within the expected limits.
Dead band can be used to avoid multiple notifications for the same event.
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