Siemens SIPART PS2 6DR52xx - Manual (Page 138)

Operation
138
SIPART PS2 Manual
A5E00074631--06
Fault indication
(symptoms)
possible cause(s) Remedies
• Actuator does not move • Compressed air < 1.4 bar • Set supply air pressure to
> 1.4 bar.
• Piezo valve(s) do(es) not
switch (quiet “clicking” can
be heard however when
the + or – button is pressed
• Reactor valve(s) closed
(screw(s) at the right-hand
stop)
• Open reactor screw(s) (see
leaflet, figure “device view (6)”
by turning it/them
anti-clockwise. the + or button is pressed
in manual mode).
• Dirt in the pneumatic block • Repair (see chapter 5,
page 145) or new device;
integrated fine screen,
also replace and clean.
• A piezo valve switches
continuously in stationary
automatic mode (constant
setpoint) and in manual
mode.
• Pneumatic leakage in the
positioner – actuator system
Start leakage test in “RUN 3”
(initialization)!!!
• Eliminate leakage in the
actuator and/or supply line
• If the actuator is intact and the
supply line is leak-tight:
Repair (see chapter 5,
page 145) or new device
• Dirt in the pneumatic block
(see above)
• see above
Table 7
Fault indication
(symptoms)
possible cause(s) Remedies
• Both piezo valves switch
continuously and
alternately in stationary
automatic mode (constant
• Too much slipstick of stuffing
box of control valve or actuator
• Reduce slipstick or increase
dead zone of SIPART PS 2
(dEbA parameter) until
oscillation stops. automatic mode (constant
setpoint) and in manual
mode, actuator oscillates
around a mean value.
• Batches (play) in the positioner
-- actuator – control valve
system
• Part--turn actuator:
Check if set screw of the
coupling wheel is inserted
firmly
• Linear actuator:
Check if lever is connected
firmly to positioning shaft.
• Eliminate any other play
between actuator and control
valve.
• Actuator too fast • Increase actuating times via
reactor screws.
• If fast actuating time is
required, increase dead zone
(dEBA parameter) until
oscillation stops.
• SIPART PS 2 does not
“drive” control valve up to
the stop (at 20 mA).
• Supply pressure too low.
• Load of the feeding controller
or system output is too low.
• Increase supply pressure
• Interconnect load converter
• Select 3/4 transmitter
operation
Table 8