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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 238)
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
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 pneu-
•
matic block
Deposits on the contacts between
•
the electronic printed circuit board
and the pneumatic block may de-
velop due to abrasion owing to con-
tinuous loads resulting from strong
vibrations.
Alarm, error, and system messages
10.4 Fault correction
Corrective measures
At an early stage, this fault can be
•
rectified with a subsequent operat-
ing 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 pneu-
matic block contact springs.
231
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