EB 8389 EN
63
Tests
5.1 Drive signal diagram
steady-state
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
•
•
•
•
•
•
The 'Drive signal diagram steady-state'
(Tests) allows you to check the results of the
drive signal diagram steady-state in Statisti-
cal information (in-service monitoring) more
closely (see section 4.6). Besides pinpointing
problems in supply pressure, it can also de-
tect defective actuator springs.
The test is started in the manual mode.
During the test the valve moves to various
fixed valve positions distributed over the
working range of the valve. The drive signal
y is measured for each valve position x and
compared with the reference graph.
The recorded data of the drive signal y are
plotted versus the valve position x in a graph
(Repetition).
Requirements
1. A single-acting actuator is mounted on
the valve.
2. No booster is mounted on the control
valve.
3. A reference test has been performed (see
section 2.4.1).
If a reference test has not be stored in the
positioner, the data of the first test per
-
formed are used as the reference.
Fig. 9:
Diagnosis > Tests > Drive signal diagram steady-state
Содержание TROVIS 3730-3
Страница 6: ...6 EB 8389 EN...
Страница 43: ......
Страница 57: ......
Страница 83: ...EB 8389 EN 83...
Страница 130: ...130 EB 8389 EN...