Siemens SIPART PS2 - Remedial Measures Table 2

Fault profile (symptoms) Possible cause(s) Corrective measures
● Positioner remains in "RUN 3". ● Actuator travel 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.
● Correct any other play between the
actuator and the control valve.
● Diagnostic value "9.TUP" or
"10.TDOWN" < 1.5 s
● Set the traversing velocity to > 1.5 s
using the internal restrictor.
Fault table 1
12.4.3 Remedial measures table 2
Fault profile (symptoms) Possible cause(s) Corrective measures
● "CPU testt" blinks on the display
approximately every 2 seconds.
● Piezo valve does not activate.
● Water in the pneumatic block (due to
wet compressed air)
● At an early stage, this fault can be
rectified with a subsequent
operating using dry air, if required, in
a temperature cabinet at 50°C to
70°C.
● Otherwise: Repair
● In the manual and automatic modes,
the actuator cannot be moved or can
be moved only in one direction.
● Moisture in the pneumatic block
● Piezo valve does not activate (a
gentle click sound is not audible
when the "+" or "-" buttons are
pressed in the manual mode.)
● 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.
● Deposits on the contacts between
the electronic printed circuit board
and the pneumatic block can
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
See also
Repair/Upgrading (Page 244)
Diagnostics and troubleshooting
12.4 Fault correction
SIPART PS2 with PROFIBUS PA
278 Operating Instructions, 05/2019, A5E00127926-AC