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Fault profile (symptoms)
Positioner remains in "RUN 3".
•
Positioner remains "RUN 5", does
•
not go up to "FINISH" (waiting time
> 5 min).
Fault table 1
12.4.3
Remedial measures table 2
Fault profile (symptoms)
"CPU test" blinks on the digital
•
display approximately every two
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
More information is given under the also-see link.
1)
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
Possible cause(s)
Actuator actuating time is too high.
•
"Gap" (play) in the positioner -
•
actuator - control valve system
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, fault and system messages
12.4 Fault correction
Remedial measures
Open the restrictor completely
•
and/or set the pressure PZ (1) to
the highest permissible value.
Use a booster if required.
•
Part-turn actuator: check for the
•
firmness of the grub screw of the
coupling wheel
Linear actuator: check for the
•
firmness of the lever on the
positioning shaft.
Remove any play between the
•
actuator and the control valve.
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
•
1)
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.
237
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