Siemens SIPART PS2 Betriebsanleitung Seite 60

Operating instruction
Fault description (symptoms)
CPU test blinks in the display of the
•
SIPART PS2 (ca. every 2 s)
Piezo valve(s) do not switch
•
Actuator cannot be moved in
•
manual or automatic mode, or only
in one direction
Piezo valve(s) do not switch (no
•
soft clicking can be heard when the
+ or -- keys are pressed in manual
mode)
Table 2
Fault description (symptoms)
Actuator does not move
•
Piezo valve(s) do not switch (al-
•
though a soft clicking can be
heard when the + or -- keys are
pressed in manual mode)
One piezo valve constantly
•
switches in stationary automatic
mode (constant setpoint) and in
manual mode
Table 3
58
Possible cause(s)
Water in the valve manifold (from
•
wet compressed air)
Dampness in the valve manifold
•
Screw between cover hood and the
•
valve manifold is not tight or the
hood is jammed
Dirt (swarf, particles) in the valve
•
manifold
Deposits on the contact(s) between
•
the electronics board and the valve
manifold can occur from abrasion
through continuous stresses from
strong vibrations
Possible cause(s)
Compressed air < 1.4 bar
•
Restrictor(s) closed down
•
(screw(s) at the right end stop)
Dirt in the valve manifold
•
Pneumatic leak in the positioner,
•
actuator system, start leak test in
RUN 3 (Initialization) !!!
Dirt in the valve manifold (see
•
above)
Corrective actions
At the early stages the fault can be
•
corrected by subsequent operation
with dry air (when necessary, in a with dry air (when necessary, in a
temperature cupboard at 50 to
70 °C)
Otherwise: repair, see page 60
•
Tighten screw, or release cause of
•
jamming when necessary
Repair, see page 60 or new device
•
with integrated fine filter which can
be replaced and cleaned
Clean all contact surfaces with alco-
•
hol: when necessary bend the valve
manifold contact springs back into
place
Corrective actions
Set inlet air pressure to > 1.4 bar
•
Open restrictor screw(s) (see leaf-
•
let, Figure "View of device (6) on
page 61") by turning to the left
Repair, see page 60 or new de-
•
vice with integrated fine filter
which can be replaced and
cleaned
Fix leak in the actuator and/or
•
supply line
If the actuator and supply line are
•
intact: repair, see page 60
See above
•
SIPART PS2 EEx d FF
A5E00351419--01