Siemens SIMATIC PCS 7 사용자 설명서
Monitoring and diagnostics
21
Monitoring and diagnostics for positioners and valves
SITRANS VP300 and SIPART PS2 are intelligent electro-
pneumatic positioners for control valves and two-position
valves in the process industry. Both devices can be used
very flexibly in various processes.
pneumatic positioners for control valves and two-position
valves in the process industry. Both devices can be used
very flexibly in various processes.
In addition to the standard function of each positioner, i.e.
controlling process valves, both devices also have comprehen-
sive diagnostic functions, which can indicate critical statuses
of the drive or valve at any time during operation of the plant.
controlling process valves, both devices also have comprehen-
sive diagnostic functions, which can indicate critical statuses
of the drive or valve at any time during operation of the plant.
The following functions are available in both devices:
• Slow movement of a valve
• Clogging of a pipeline
• Tear-off of the valve plug
• Wear of the valve seat or valve plug
• Adhesion of the stuffing box
• Partial stroke test for two-position valves
• Slow movement of a valve
• Clogging of a pipeline
• Tear-off of the valve plug
• Wear of the valve seat or valve plug
• Adhesion of the stuffing box
• Partial stroke test for two-position valves
In addition, both devices offer other individual functions for
detecting critical statuses of the control valve:
detecting critical statuses of the control valve:
SITRANS VP300
For detecting positions, the device uses a permanent magnet
on the spindle of the drive and sensors in the interior of the
positioner. If the magnet is physically moved or missing, this
is detected and signaled by the positioner. In addition, the Par-
tial Stroke Test is optionally SIL-certified.
on the spindle of the drive and sensors in the interior of the
positioner. If the magnet is physically moved or missing, this
is detected and signaled by the positioner. In addition, the Par-
tial Stroke Test is optionally SIL-certified.
SIPART PS2
In addition to detecting pneumatic leaks, the device is also ca-
pable of performing a solenoid valve test. If a suitable soleno-
id valve is used, it is thus possible to make a reliable statement
about the correct functioning of the connected solenoid val-
ve.
pable of performing a solenoid valve test. If a suitable soleno-
id valve is used, it is thus possible to make a reliable statement
about the correct functioning of the connected solenoid val-
ve.
These faults are reported based on their severity and, conse-
quently, the urgency of maintenance they require using the 3-
stage evaluation scale of the SIMATIC PCS 7 Maintenance Sta-
tion. The faults are also displayed and analyzed on the on-site
display. Thus, faults can be detected early, long before failures
or even plant stoppages occur.
quently, the urgency of maintenance they require using the 3-
stage evaluation scale of the SIMATIC PCS 7 Maintenance Sta-
tion. The faults are also displayed and analyzed on the on-site
display. Thus, faults can be detected early, long before failures
or even plant stoppages occur.
With regard to preventive maintenance measures, the fol-
lowing values are also monitored and a 3-stage message can
sometimes be output, as described above:
• Operating hours (also differentiated by temperature ran-
lowing values are also monitored and a 3-stage message can
sometimes be output, as described above:
• Operating hours (also differentiated by temperature ran-
ges and adjusting ranges)
• Operating temperature, current and min./max.
• Stroke counter (stroke integral)
• Number of changes in direction
• Stroke counter (stroke integral)
• Number of changes in direction
The most important status parameters can be visualized using
a suitable HMI tool (e.g. SIMATIC PDM) both in trend view and
in histogram view.
a suitable HMI tool (e.g. SIMATIC PDM) both in trend view and
in histogram view.
The benefits of predictive maintenance are based on the fact
that the corresponding components can be used for their en-
tire service life without the risk of failure or damage. The dia-
gnostic functions in SITRANS VP300 and in SIPART PS2 also
help with the early detection of impending damage to the
drive or valve, which can lead to a plant stoppage in the worst
case scenario. Thus, information can be gained from the load
factor, which can be used to optimize the way in which the
plant is operated or for advance maintenance. In total, this
leads to an increase in the availability of the entire plant.
that the corresponding components can be used for their en-
tire service life without the risk of failure or damage. The dia-
gnostic functions in SITRANS VP300 and in SIPART PS2 also
help with the early detection of impending damage to the
drive or valve, which can lead to a plant stoppage in the worst
case scenario. Thus, information can be gained from the load
factor, which can be used to optimize the way in which the
plant is operated or for advance maintenance. In total, this
leads to an increase in the availability of the entire plant.
SIPART PS2 and SITRANS VP300 POSITIONERS
SITRANS VP300 and SIPART PS2 offer a standard Partial Stroke Test in order
to extend the maintenance interval of two-position valves
to extend the maintenance interval of two-position valves
Maintenance_PA_04_2010_en.book Seite 21 Dienstag, 6. September 2011 9:45 09
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