Samson 3730 Series Operating Instructions

34 EB 8389-1S EN
Valve signature
4.4.1 Analysis and monitoring
The positioner generates the 'Change in fric-
tion' message with the selected status classi-
cation. The friction for the total range of the
valve, the mid valve position and for the
ranges near to the end positions are com-
pared.
The positioner calculates the friction during
closed-loop operation from the actuator ll-
ing and venting graphs at the point where a
directional change in valve travel takes
place. The positioner converts the friction da-
ta into xed points close to the point of di-
rectional change and compares them to the
reference friction.
If the friction at a xed point increases to
more than double of the reference friction,
the friction is regarded to be higher.
If the friction at a xed point drops to less
than half of the reference friction, the friction
is regarded to be lower.
Note:
To ensure that sufcient data points
are available for calculating the fric-
tion, the valve must not be moved too
quickly.
Diagnostics > Monitoring > Valve
− Change in friction:
, , ,
4.5 Resetting single status mes-
sages
All messages generated by the valve signa-
ture can be reset together by selecting and
executing "Reset 'Pressure sensor monitoring
values". These messages include:
− Change in friction
− Supply pressure status
− Defective actuator springs
− Zero
At the same time, the supply pressure data
(supply pressure, min. supply pressure and
max. supply pressure) are reset as well.
Diagnostics > Service/maintenance > Reset
− Reset 'Pressure sensor monitoring values'


Samson 3730 Series Specifications

General

Brand	Samson
Model	3730 Series
Category	Valve Positioners
Language	English