Remedial Measures Table 3; Remedial Measures Table 4 - Siemens SIPART PS2 PA 6DR55 Series Operating Instructions Manual

Alarm, fault and system messages
12.4 Fault correction
12.4.4

Remedial measures table 3

Fault profile (symptoms)
Actuator does not move.
•
Piezo valve does not activate (a
•
gentle click sound is however
audible when the "+" or "-" buttons
are pressed in the manual mode.)
A piezo valve activates constantly in
•
the stationary automatic mode
(constant setpoint) and the manual
mode.
Fault table 3
More information is given under the also-see link.
1)
12.4.5

Remedial measures table 4

Fault profile (symptoms)
In the stationary automatic mode
•
(constant setpoint) and in the
manual mode, both piezo valves
are continuously activated
alternately and the actuator
oscillates to a mean value.
Fault table 4
238
Possible cause
Compressed air < 1.4 bar
•
Restrictor valve turned off (screw at
•
the right end stop)
Dirt in the pneumatic block
•
Pneumatic leakage in the positioner
•
- actuator system; start the leakage
test in "RUN 3" (initialization).
Dirt in the pneumatic block, see
•
above
Possible cause(s)
Static friction of the packing gland
•
of the control valve and the actuator
is too high
Gap (play) in the positioner -
•
actuator - control valve system
Actuator is too fast
•
Remedial measures
Set the supply air pressure to
•
> 1.4 bar.
Open the restrictor screw by turning
•
it anticlockwise, see leaflet, "Device
view (6)".
Repair or a new device; clean
•
1)
and/or replace the built-in fine
screens.
Rectify leakage in the actuator
•
and/or feed line.
In case of an intact actuator and
•
tight feed line: repair
device
See above
•
Remedial measures
Reduce the static friction or
•
increase the dead zone of SIPART
PS2 ("dEbA" parameter) until the
oscillatory movement stops.
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.
Increase the actuating times using
•
the restrictor screws.
If a fast actuating time is required,
•
increase the dead zone ("dEBA"
parameter) until the oscillatory
movement stops.
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
or a new
1)