Siemens SIPART PS2 6DR50xx Instrucciones de operaciones Pagina 196

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Alarm, error, and system messages
11.4 Fault correction
SIPART PS2 with and without HART communications
196 Operating Instructions, 09/2007, A5E00074631-07
11.4.4 Remedial measures table 3
Fault profile (symptoms) Possible cause Remedial measures
Actuator does not move. Compressed air < 1.4 bar Set the supply air pressure to
> 1.4 bar.
Restrictor valve turned off (screw at
the right end stop)
Open the restrictor screw by turning
it anticlockwise, see leaflet, "Device
view (6)".
Piezo valve does not activate (a
gentle click sound is however
audible when the "+" or "-" buttons
are pressed in the manual mode.)
Dirt in the pneumatic block Repair
1)
or a new device; clean
and/or replace the built-in fine
screens.
Pneumatic leakage in the positioner
- actuator system; start the leakage
test in "RUN 3" (initialization).
Rectify leakage in the actuator
and/or feed line.
In case of an intact actuator and
tight feed line: repair
1)
or a new
device
A piezo valve activates constantly in
the stationary automatic mode
(constant setpoint) and the manual
mode.
Dirt in the pneumatic block, see
above
See above
Fault table 3
1)
More information is given under the also-see link.
See also
Service and maintenance (Page 199)
11.4.5 Corrective measures Table 4
Symptoms Possible cause(s) Corrective measures
Sticking friction of the packing
gland from the control valve or
actuator too large
Reduce friction or increase dead zone of
positioner (parameter "dEbA") until the
oscillation stops.
Looseness (play) in the
positioner/actuator/control valve
system
Part-turn actuator: Check for firm seating
of set screw on coupling wheel.
Linear actuator: Check for firm seating of
lever on positioner shaft.
Correct any other play between the
actuator and the control valve.
In stationary automatic mode
(constant setpoint) and in
manual mode, both piezo
valves continually switch
alternately, and the actuator
oscillates around a mean value.
Actuator too fast Increase actuating times using throttle
screws.
If a quick actuating time is needed,
increase the dead zone (parameter
"dEbA") until the oscillation stops.
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