Operating instructions

Alarm, error, and system messages
11.4 Fault correction
SIPART PS2 with and without HART communications
202 Operating Instructions, 09/2008, A5E00074631-08
Fault profile (symptoms) Possible cause Remedial measures
• 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 205)
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.
• 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
Service and maintenance (Page 205)