Siemens sipart ps2 Operating Instructions Manual page 24

Fault description (symptoms)
SIPART PS2 comes to a halt in
•
RUN 3
SIPART PS2 comes to a halt in
•
RUN 5, does not reach FINISH
(waiting time > 5 min)
Table 1
Fault description (symptoms)
CPU test blinks in the display of the
•
SIPART PS2 (ca. every 2 secs)
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
SIPART PS2
A5E00074600-05
Possible cause(s)
Actuator positioning time too long
•
Play in the positioner, actuator,
•
fittings system
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)
Operating instructions
Corrective actions
Open restrictor fully and/or set
•
pressure PZ(1) to the highest
permissible value
Use booster if necessary
•
Linear actuator:
•
Check seating of the stud screw of
the coupling wheel
Rotary actuator:
•
Check seating of the lever on the
positioner shaft
Correct any other play between the
•
actuator and the fittings
Corrective actions
At the early stages the fault can be
•
corrected by subsequent operation
with dry air (when necessary, in a
temperature cupboard at 50 to temperature cupboard at 50 to
70 °C)
Otherwise: Repair at CSC (see
•
page 66)
Tighten screw, or release cause of
•
jamming when necessary
1)
Repair at CSC 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)") by
turning to the left
1)
Repair at CSC or new device
•
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 of SIPART PS 2 at CSC
or new device
See above
•
1)
65