Alarm, fault and system messages
12.4 Fault correction
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
237
Fault profile (symptoms)
Possible cause(s)
Remedial measures
•
Positioner remains in "RUN 3".
•
Actuator actuating time is too high.
•
Open the restrictor completely
and/or set the pressure PZ (1) to
the highest permissible value.
•
Use a booster if required.
•
Positioner remains "RUN 5", does
not go up to "FINISH" (waiting time
> 5 min).
•
"Gap" (play) in the positioner -
actuator - control valve system
•
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.
Fault table 1
12.4.3
Remedial measures table 2
Fault profile (symptoms)
Possible cause(s)
Remedial measures
•
"CPU test" blinks on the digital
display approximately every two
seconds.
•
Piezo valve does not activate.
•
Water in the pneumatic block (due
to wet compressed air)
•
In the manual and automatic
modes, the actuator cannot be
moved or can be moved only in one
direction.
•
Moisture in the pneumatic block
•
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)
•
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.
•
Piezo valve does not activate (a
gentle click sound is not audible
when the "+" or "-" buttons are
pressed in the manual mode.)
•
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
1)
More information is given under the also-see link.
