30 EB 8389-1S EN
Valve signature
2. Set the limit for zero monitoring in con-
trol valves with closed position ATC (air
to close).
3. Select classication for status messages.
See u Section 4.2.1.
2.
Device settings > Alarm settings
− Zero limit (Code 48 - d5):
0.0 to 100.0 %, [5.0 %]
− Lag time: 1 to 9999 s, [30 s]
3.
Device settings > Alarm settings > Status
classication > Positioner
− Zero (Code 58):
, [ ], ,
Device settings > Alarm settings > Status
classication > Actuator
Defective actuator springs
− Reduced spring pre-loading:
[ ], , ,
4.2.1 Analysis and monitoring
If the monitoring line has a smaller gradient
than the reference line, this pinpoints to a re-
duced compression of the actuator springs.
Diagnostics > Monitoring > Actuator
− Defective actuator springs:
, , ,
Valves with ATC (air to close) closed posi-
tion
In valves with ATC closed position, the posi-
tioner generates a zero error when the valve
position in the tight-closing position is larger
than the sum of the initialization zero points
and 'Zero limit' or smaller than the negative
'Zero limit' after the adjusted 'Lag time' has
elapsed.
Diagnostics > Monitoring > Positioner
− Zero (Code 58):
, , ,
Fig. 3: Diagnostics > Monitoring/tests > Valve signature > Valve signature, signal pressure(x)
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