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Setting values:
Active interface
Signals for triggering a PVST are sent via the active interface, i.e. changing the
command source also changes the failure source of the PVST.
I/O interface
Signals for triggering a PVST must be configured as binary signals (default: +24 V
DC) at a digital input.
Fieldbus interface
Signals for triggering a PVST must be enabled via
PVST
fieldbus command.
9.9.3.
Operation mode for PVST
Required user level:
Specialist (4)
or higher.
Customer settings M0041
PVST M0852
PVST operation mode M0889
Default value:
Stroke
Setting values:
Stroke
Stroke controlled PVST; operation across defined stroke (parameter
PVST stroke
)
within a defined time (parameter
PVST monitoring
). In this operation mode, the PVST
can be started in any valve position (even outside the end position).
End position test
Operating time controlled PVST; operation within a defined time (parameter
PVST
operating time
) after leaving an end position. In this operation mode, PVST can only
be started from one of the end positions.
9.9.4.
Behaviour for PVST: define
The test can be performed in direction OPEN or direction CLOSE.
Customer settings M0041
PVST M0852
PVST behaviour M0853
Default value:
OPEN
Setting values:
OPEN
Testing by operation in direction OPEN.
CLOSE
Testing by operation in direction CLOSE.
9.9.5.
Partial stroke for PVST: set
During stroke controlled PVST execution (parameter
PVST operation mode M0889
=
Stroke
), this parameter determines the partial stroke for a PVST.
Usually, the valve stroke amounts to 10 to 15 %. The amount of the partial stroke
depends on process requirements and the required diagnostic coverage rate.
Customer settings M0041
PVST M0852
PVST stroke M0854
Default value:
10.0 %
Setting range:
0.0 ... 100.0 %
9.9.6.
PVST monitoring time: set
The actuator remains in the current position if the test could not be completed within
the pre-set time.
Customer settings M0041
PVST M0852
PVST monitoring M0855
Default value:
01:00.0 min:s
(1 minute)
Setting range:
00:01.0 ... 50:00.0 min:s
(minutes:seconds)
100
Actuator controls
Failure functions
ACV 01.2/ACVExC 01.2 Profibus DP