Functional safety for SIPART PS2 FF
A5E00489774-02, 10/2013
33
C.3.3
Remedial measures table 2
Fault profile (symptoms)
Possible cause(s)
Remedial measures
●
"CPU testt" blinks on the display
approximately every 2 seconds.
●
Piezo valve does not activate.
●
Water in the pneumatic block (due
to wet compressed air)
●
At an early stage, this fault can be
rectified with a subsequent
operating using dry air, if required,
in a temperature cabinet at 50 to
70°C.
●
Otherwise: Repair
●
In the manual and automatic
modes, the actuator cannot be
moved or can be moved only in one
direction.
●
Moisture in the pneumatic block
●
Piezo valve does not activate (a
gentle click sound is not audible
when the "+" or "-" buttons are
pressed in the manual mode.)
●
The screw between the shrouding
cover and the pneumatic block has
not been tightened firmly or the
cover got stuck.
●
Tighten the screw firmly; if required,
rectify the deadlock.
●
Dirt (swarf, particles) in the
pneumatic block
●
Repair or a new device; clean
and/or replace the built-in fine
screens.
●
Deposits on the contacts between
the electronic printed circuit board
and the pneumatic block may
develop due to abrasion owing to
continuous loads resulting from
strong vibrations.
●
Clean all contact surfaces with
spirit; if required, bend the
pneumatic block contact springs.
Fault table 2
C.3.4
Remedial measures table 3
Fault profile (symptoms)
Possible cause
Remedial measures
●
Actuator does not move.
●
Compressed air < 1.4 bar
●
Set the supply air pressure to
> 1.4 bar.
●
Piezo valve does not activate (a
gentle click sound is however
audible when the "+" or "-" buttons
are pressed in the manual mode.)
●
Restrictor valve turned off (screw at
the right end stop)
●
Open the restrictor screw by turning
it anticlockwise, see leaflet, "Device
view (6)".
●
Dirt in the pneumatic block
●
Repair or a new device; clean
and/or replace the built-in fine
screens.
●
A piezo valve activates constantly in
the stationary automatic mode
(constant setpoint) and the manual
mode.
●
Pneumatic leakage in the positioner
- actuator system; start the leakage
test in "RUN 3" (initialization).
●
Rectify leakage in the actuator
and/or feed line.
●
In case of an intact actuator and
tight feed line: Repair or new device
●
Dirt in the pneumatic block, see
above
●
See above
Fault table 3
