Badger Meter SRD/SRI Valve Positioners - Manual (Page 75)

Response History
The Response History is a Histogram that shows the control behavior of
the actuator/valve in percentage over time .
The histogram is divided into 5 segments, each representing a
specific control behavior . This allows identifying if an actuator/valve is
predominantly in a steady state, transient, offset for instance if there is a
constant control deviation between the setpoint and the valve position
or if its unstable .
The exact percentage of each response behavior is identified by the values listed above the histograms .
• Offline . This value is increased if the positioner is powered up, but the Autostart has not been activated yet, or the
positioner has manually been put into the device status Offline .
• Steady . This value is increased if the positioner is in control, but not moving . The setpoint and the valve position are
constant at a certain value . See Position History for exact valve position .
• Transient . This value is increased if the positioner is online and constantly moving .
• Offset . This value is increased if the positioner identifies a deviation between the setpoint and the valve position, greater
than the specified control deviation configured under alarms .
• Unstable . This value is increased if the positioner is continuously oscillating around a constant setpoint . An Unstable
behavior in the control can occur, if there’s a leakage in the actuator diaphragm, a leakage in the output-pressure
connection between the positioner and the actuator or if the stem-lock or coupling is shifting .
The Response History can display 4 different History Intervals . These Historians allow seeing the response behavior up to the
last 60 months . The 4 Historians can be configured under Configuration/Maintenance/History Interval .
Response History with Combo Box
Diagnostics
Page 75 August 2014 POS-UM-00011-EN-02