Siemens 6DR55 Series Manual page 112

Operation
49. OPEN
.
50. DEBA
51.PRST
.
52.FSTY
110
Tolerance value for monitoring the top hard stop
With this value a limit value (in percent related to the total mechanical
distance) can be preset for the monitoring of the top hard stop. If this
tolerance value is exceeded or dropped below of, the fault message
output (optional) is activated.
This function detects when the top stop has changed by more then the
specified tolerance related to its initialization value. Monitoring takes
place when the valve is in tight closing top. Activation of the tight
closing top function (parameter "35.YCLS") is therefore a prerequisite.
The fault message remains activated until either a subsequent
monitoring remains within the tolerance or a new initialization is
performed.
This monitoring function can be deactivated with the OFF setting
(factory setting).
NOTE
But the monitors of the bottom and top hard stop do not only react to
valve errors. Adjustment of the position feedback is also detected as
an error if the tolerance values are exceeded as a result.
Limit value for monitoring the dead zone adaptation
The automatic adaptation of the dead zone can be monitored with this
value (%). If the dead zone exceeds the set value, the fault message
output is activated.
Prerequisite for this function is the setting of the parameter"31.DEBA" =
Auto. This monitoring function can be deactivated with the OFF setting
(factory setting).
Preset
Establishing the factory setting and resetting the initialization.
NOTE
The positioner must be re--initialized after "Preset". All previously
determined maintenance parameters are cleared.
Safety position
This parameter is used to move the actuator into a set safety position if
communication fails.
SIPART PS2 PA Manual
A5E00127926--05