Siemens PROFIBUS PA SIPART PS2 Manual page 111

Error Event
code
5 Limit value
change of di-
rection excee-
ded
6 Limit value bot-
tom hard stop
exceeded
7 Limit value
top hard stop
exceeded
8 Limit value
dead zone
adaptation ex-
ceeded
Table 4-2 Events which can activate the fault message output
Explanations of column "Error codes":
1 Monitoring of control error
2 Monitoring automatic operation
3 Digital input DI1 or DI2 active
SIPART PS2 PA Manual
A5E00127926-03
Parameter Fault message dis-
setting appears when ...
... the change of direction
47. DCHG¸OFF
counter is reset or the limit
value increased
... the deviation of the stop
48. ZERO¸OFF
disappears or the
35.YCLS = do or
instrument is re-initialized
up do
... the deviation of the stop
49. OPEN¸OFF
disappears or the
35. YCLS = up or
instrument is re-initialized
up do
... the limit value is
50. DEBA¸OFF
dropped below again
31.DEBA = Auto
In automatic operation the error between setpoint and actual value is
monitored continuously. The fault message is activated with unchanged
control error according to the setting of the parameters 44. TIM, moni-
toring time for setting the fault messages and 45. LIM, response
threshold of the fault message. As soon as the control error drops back
below the response threshold, the fault message is reset.
A fault message is generated when the instrument is not in the auto-
matic mode at the appropriate parameter setting "43. FCT". In this way
the control system can be warned for example when the instrument has
been switched to manual operation or Configuration on site.
A fault message is generated when the digital input is activated at the
the corresponding setting of the parameter "43. FCT", function of the
fault message output and the parameter "38.BIN1", function digital in-
put 1. This may be a switch for stuffing box monitoring, a temperature
switch or a limit value switch for example.
Digital input 2 (on the alarm module option) can be configured in the
same way.
Operation
Possible causes
The number of changes of
direction exceeded the set
limit value.
Wear of the valve seat, de-
posits or foreign bodies in
the valve seat, mechanical
maladjustment, slip clutch
maladjusted.
Wear of the valve seat, de-
posits or foreign bodies in
the valve seat, mechanical
maladjustment, slip clutch
maladjusted.
Increased stuffing box
friction, mechanical lots of
the position feedback
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