Siemens 6DR55 Series, Manual

Page: 130 / 178

Operation
128
SIPART PS2 PA Manual
A5E00127926--05
Fault description (symp-
toms)
Possible cause(s) Corrective actions
•
CPU test blinks in the
display of the posi-
tioner (ca. every 2
secs)
•
Piezo valve(s) do not
switch
•
Water in the valve manifold
(from wet compressed air)
•
At the early stages the fault can be
corrected by subsequent operation
with dry air (when necessary, in a
temperature cupboard at 50 to
70
°
C)
•
Otherwise: Repair see page 160.
•
Actuator cannot be
moved in manual or
automatic mode, or
only in one direction
•
Dampness in the valve manifold
Otherwise: Repair see page 160.
•
Piezo valve(s) do not
switch (no soft clicking
can be heard when the
•
Screw between cover hood and
the valve manifold is not tight or
the hood is jammed
•
Tighten screw, or release cause of
jamming when necessary
can be heard when the
+ or -- keys are
pressed in manual
mode)
•
Dirt (swarf, particles) in the
valve manifold
•
Repair see page 160.
New device with integrated fine fil-
ter which can be replaced and
cleaned
•
Deposits on the contact(s)
between the electronics board
and the valve manifold can
occur from abrasion through
continuous stresses from strong
vibrations
•
Clean all contact surfaces with
alcohol: when necessary bend the
valve manifold contact springs
back into place
Table 4
Fault description (symp-
toms)
Possible cause(s) Corrective actions
•
Actuator does not
move
•
Compressed air < 1.4 bar
•
Set inlet air pressure to > 1.4 bar
•
Piezo valve(s) do not
switch (although a
soft clicking can be
heard when the + or --
keys are pressed in
manual mode)
•
Restrictor(s) closed down
(screw(s) at the right end stop)
•
Open restrictor screw(s) (see leaf-
let, Figure ”View of device (6)”) by
turning to the left
•
Dirt in the valve manifold
•
Repair see page 160.
New device with integrated fine
filter which can be replaced and
cleaned
•
One piezo valve
constantly switches in
stationary automatic
mode (constant
setpoint) and in
manual mode
•
Pneumatic leak in the positio-
ner, actuator system, start leak
test in RUN 3 (Initialization)
•
Fix leak in the actuator and/or
supply line
•
If the actuator and supply line are
intact:
Repair see page 160 or new
device
•
Dirt in the valve manifold (see
above)
•
See above
Table 5