Electropneumatic Positioner Part Manual

Operation
137
SIP ART PS2 Manual
A5E00074631--06
Fault indication
(symptoms)
possible cause(s) Remedies
• SIPART PS2 stops during
“RUN 1”.
• Initialization started from end
position
and
• reaction time of max. 1 min.
not waited for.
• Mains pressure not connected
or insufficient.
• Up to 1 min. delay time
required.
• Do not start initialization from
end position.
• Secure the mains pressure.
• SIPART PS2 stops during
“RUN 2”.
• Transmission ratio selector and
parameter 2 (YAGL) as well as
actual stroke do not match.
• Stroke not correctly set for
lever.
• Piezo valve(s) do(es) not
switch (see table 6).
• Check settings:
• see leaflet: figure “device view
(7)” as well as parameters 2
and 3
• Check stroke setting at lever.
• seetable2
• SIPART PS2 stops during
“RUN 3”.
• Actuating time too high. • Open reactor completely
and/or set PZ pressure (1) to
maximum permissible value.
• If necessary, use booster.
• SIPART PS2 stops during
“RUN 5”and does not reach
“FINISH” (delay time:
>5min).
• “Batches” (play) in the
positioner -- actuator -- control
valve system
• Part-turn actuator:
Check if set screw of the
coupling wheel is inserted
firmly
• Linear actuator:
Check if lever is connected
firmly to positioning shaft.
• Eliminate any other play
between actuator and control
valve.
Table 5
Fault indication
(symptoms)
possible cause(s) Remedies
• For SIPART PS2, “CPU
test” flashes in the display
(approx. every 2 sec).
• Piezo valve(s) do(es) not
switch.
• Water in the pneumatic block
(due to wet compressed air)
• At an early stage, this fault can
be eliminated by subsequent
operation with dry air (if ne-
cessary, in the temperature
cabinet at 50 to 70°C).
• In manual or automatic
mode, the actuator cannot
be moved or only in one
direction.
• Moisture in the pneumatic
block
• Otherwise: Repair
(see chapter 5, page 145)
• Piezo valve(s) do(es) not
switch (no quiet “clicking”
can be heard when the + or
–
buttonispressedin
• Screw between shrouding
cover and pneumatic block not
tightened firmly or cover
jammed.
• Tighten screw, if necessary
eliminate jam.
b
u
t
t
o
n
i
s
p
r
e
s
s
e
d
i
n
manual mode).
• Dirt (chips, particles) in the
pneumatic block
• Repair (see chapter 5,
page 145) or new device;
integrated fine screen,
also replace and clean.
• Deposits on contact(s)
between electronics board and
pneumatic block can develop
due to abrasion as a result of
continuous high vibration
stress.
• Clean all contact surfaces with
spirit; if necessary, re-bend the
pneumatic block springs
slightly.
Table 6