EB 8389-1S EN
33
Valve signature
4.4
Valve signature, friction(x)
The positioner calculates the friction during
closed-loop operation and compares it with
the friction determined when the reference
graph was plotted.
Data are recorded automatically 15 minutes
after initialization (regardless of the operat-
ing mode selected) if a reference graph has
already been plotted. Data logging does not
need to be activated.
Defining parameters
1. Record the reference graph. See
u
2.
Select classification for status messages.
See
2.
Device settings > Alarm settings > Status
classification > Valve
Change in friction
−
Higher in total range: [ ], , ,
−
Lower in total range: [ ], , ,
−
Higher in mid-position: [ ], , ,
−
Lower in mid-position: [ ], , ,
−
Higher near max. OPEN position:
[ ], , ,
−
Lower near max. OPEN position:
[ ], , ,
−
Higher near CLOSED position:
[ ], , ,
−
Lower near CLOSED position:
[ ], , ,
Fig. 5:
Diagnostics > Monitoring/tests > Valve signature >
Valve signature, friction(x)
