||Realize the full potential of the FIELDVUE Digital
Valve Controllers with AMS ValveLink Software and FIELDVUE Diagnostics
Predictive in-service diagnostics for monitoring the health of the valve assembly
and customized diagnostics for advanced troubleshooting.
The predictive in-service diagnostics may be used to detect problems with
air leakage, valve assembly friction and deadband, instrument air quality,
loose connections, supply pressure restriction, and valve assembly
calibration. When a problem is identified, the diagnostic provides a
description and severity of the problem, a probable cause, and recommended
In-service diagnostics for troubleshooting allow custom diagnostics to be set
up to collect data at a high-frequency collection rate and present the data
in a graphical format. When an issue is so complex that external expertise is
required, the data may be exported from the custom diagnostic and sent to an
expert for evaluation, thereby eliminating the need for an on-site visit.
Valve Signature Diagnostic
FIELDVUE Advanced Diagnostics vary the digital valve controller set point
and plot valve operation to provide insight into the dynamic performance
of the valve/actuator assembly. Advanced Diagnostics include out-of-service
diagnostics such as valve signature, dynamic error band, and step response that
will assist in the identification of emerging valve problems quickly and accurately.
The Valve Signature diagnostic is used to:
- Valve friction, deadband, and shutoff capability.
- Actuator spring rate and bench set.
- Potential packing problems.
- Compare current condition to previous baseline condition.
The Dynamic Error Band diagnostic is used to analyze hysteresis, deadband, and dynamic
Step Response Diagnostic
The Step Response diagnostic allows you to evaluate how well the valve tracks an input
change. By minimizing dead time, dead band, and overshoot, process control is
greatly enhanced. With the Step Response test you can:
A Performance step test provides a predefined sequence of 29 steps. This test allows the
user to quickly evaluate valve and actuator response to signal change and determine maximum
- Validate tuning parameters.
- Obtain a numerical analysis for overshoot, hysteresis, dead time, t63, and t86.
- Define up to 11 steps.