Operating instructions

Alarm, error, and system messages
11.3 Online diagnostics
SIPART PS2 with and without HART communications
190 Operating Instructions, 09/2007, A5E00074631-07
11.3.4 Meaning of error codes
1 Monitoring of control deviation
The deviation between the setpoint and the actual value is continuously monitored in the
automatic mode. The fault message for the remaining control deviation is activated
depending on the setting of the "
TIM" parameter, monitoring time for setting the fault
messages and "
LIM" and the response threshold. The fault message is cancelled as soon
as the control deviation drops below the response threshold.
2 Automatic mode monitoring
If the " FCT" parameter is set correctly and the fault message output is functioning properly,
a fault message is generated when the device is not in the automatic mode. A warning can
thus be sent to the control system when the device was switched to manual or configuration
mode on-site.
3 Binary input BE1 or BE2 active
If the " FCT" and the "BIN1" parameters are set correctly and the fault message output and
binary input 1 are functioning properly, a fault message is generated when the binary input is
activated. For example, it can be a switch to monitor the packing glands, a temperature
switch or a limit switch (e.g. for pressure).
Binary input 2 (in the optional alarm unit) can be configured in a similar manner.
4 Monitoring of the stroke number
5 Monitoring of the number of changes of direction
Both the values, namely the stroke number and the number of changes of direction are
constantly compared with the thresholds that are determined from the parameters "L1.LIMIT"
to "L4.FACT3" and "O1.LIMIT" to "O4.FACT3". If the thresholds are exceeded, the fault
message output or the alarm outputs respond depending on the mode of the advanced
diagnostics. Both these functions can be deactivated using the parameter setting "OFF" for
"L.
STRK" and "O. DCHG".
6 Monitoring of the lower hard end stop (valve seat)
7 Monitoring of the upper hard end stop
The monitoring of the lower hard end stop is activated when the value of the "F. ZERO"
parameter is "OFF". This function can be used to detect the errors in the valve seat. An
overshot limit indicates the possibility of deposits or foreign bodies in the valve seat. An
undershot limit indicates probable wear and tear of the valve seat or flow restrictor. Even a
mechanical misalignment of the position feedback can trigger this fault message.
Monitoring is always carried out whenever the valve is in the "down tight closing" position.
The current position is compared with the position that was determined as the lower end stop