Siemens SIPART Series - 10.4.5 Remedial measures table 4

Alarm, error, and system messages
10.4 Fault correction
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
229
10.4.5
Remedial measures table 4
Symptoms
Possible cause(s)
Remedial measures
• In stationary automatic mode
(constant setpoint) and in manual
mode, both piezo valves continually
switch alternately, and the actuator
oscillates around a mean value.
• 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.
• 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.
• Positioner doesn't move control
valve to the stop (at 20 mA).
• Supply pressure too low. Load on
the feeding controller or system
output is too low.
• Increase supply pressure, insert
ballast converter
• Select 3/4-wire mode
Error table 4
See also
Cleaning of the screens (Page 232)