Siemens PROFIBUS PA SIPART PS2 Manual page 103

50. DEBA
51.PRST
.
52.FSTY
53.FSTI
54.FSVL
SIPART PS2 PA Manual
A5E00127926-03
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 deter-
mined maintenance parameters are cleared.
Safety position
This parameter is used to move the actuator into a set safety position if
communication fails.
Three settings are possible
FSVL
S
the actuator must continue to control with the parameterized safety
setpoint. This value will remain effective even after a loss of electri-
cal power.
FSSP
S
the actuator must continue to control with the last effective setpoint
FSAC (factory setting)
S
here this outlet air valve is opened and the single-acting actuator
moves to its final position by spring power.
Monitoring time for moving to the safety position
If communications are lost, the positioner will move to the safety posi-
tion after expiry of the set period of time.
Safety setpoint
Specification for the safety setpoint
Note that the fail safe value FSVL of 0 % always refers to the mechani-
cal position taken up when the actuator is depressurized. This is partic-
ularly important if the parameter SDIR is set to FALL (falling character-
istic of the setpoint) and then at 0% setpoint 100 % mechanical position
is expected.
Operation
101