Siemens SIPART Series Operating Instructions Manual page 229

10.4.3 Remedial measures table 2
Fault profile (symptoms)
"CPU testt" blinks on the display
•
approximately every 2 seconds.
Piezo valve does not activate.
•
In the manual and automatic
•
modes, the actuator cannot be
moved or can be moved only in one
direction.
Piezo valve does not activate (a
•
gentle click sound is not audible
when the "+" or "-" buttons are
pressed in the manual mode.)
Fault table 2
See also
Repair/Upgrading (Page 233)
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
Possible cause(s)
Water in the pneumatic block (due
•
to wet compressed air)
Moisture in the pneumatic block
•
The screw between the shrouding
•
cover and the pneumatic block has
not been tightened firmly or the
cover got stuck.
Dirt (swarf, particles) in the
•
pneumatic block
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.
Alarm, error, and system messages
10.4 Fault correction
Remedial measures
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
•
Tighten the screw firmly; if required,
•
rectify the deadlock.
Repair or a new device; clean
•
and/or replace the built-in fine
screens.
Clean all contact surfaces with
•
spirit; if required, bend the
pneumatic block contact springs.
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