Siemens SIPART PS2 6DR50xx Manual page 138

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