Corrective Measures Table 4; Remedial Measures Table 5 - Siemens SIPART PS2 Operating Instructions Manual

10.4.5

Corrective measures Table 4

Fault profile (symptoms)
● In stationary automatic mode
(constant setpoint) and in "Manual"
mode, both piezo valves continually
switch alternately, and the actuator
oscillates around an average value.
● Positioner doesn't move control
valve to the stop (at 20 mA).
Error table 4
See also
Cleaning of the screens (Page 226)
10.4.6

Remedial measures table 5

Fault profile (symptoms)
● Zero point displaces sporadically
(> 3%).
● The device function has completely
failed: No representation on the
display either.
Fault table 5
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC
Possible cause(s)
● Stiction of the packing gland from
the control valve or actuator too large
● Looseness (play) in the positioner/
actuator/control valve system
● Actuator too fast
● Supply pressure too low. Load on
the feeding controller or system
output is too low.
Possible cause(s)
● Impact or shock loads result in
accelerations so high that the friction
clutch moves, e.g. due to "vapor
shocks" in vapor lines.
● Electrical auxiliary power supply is
not adequate.
● In case of very high continuous
loads due to vibrations (oscillations):
● Screws of the electrical connecting
terminals may be loosened.
● Electrical connecting terminals and/
or electronic components may be
knocked out.
Alarm, error, and system messages
10.4 Fault correction
Corrective measures
● Reduce stiction or increase
deadband of positioner (parameter
"dEbA") until the oscillation stops.
● 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.
● Increase travel times using throttle
screws.
● If a quick travel time is needed,
increase the deadband (parameter
"dEbA") until the oscillation stops.
● Increase supply pressure, insert
ballast converter
● Select 3/4-wire mode
Corrective measures
● Rectify the causes for shock loads.
● Re-initialize the position controller.
● Check the electrical auxiliary power
supply.
● Tighten the screws firmly and secure
using sealing wax.
● Repair
● For prevention: Install the positioner
on the damping pads.
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