Samson 5857, Mounting And Operating Instructions, Page: 63 / 80

EB 5857 EN 16-3
Annex A (configuration instructions)
− 'Positioning value upon input signal failure' = Last position
The actuator stem remains in the last position that the valve moved to before failure of the
input signal.
The error message is reset and the actuator returns to closed-loop operation if the input sig-
nal moves within 0.2 V of the lower range value.
Settings\Actuator\Functions
Functions WE Adjustment range
Detect input signal failure No Yes/No
Positioning value upon input signal failure Internal Internal, last position
Internal positioning value 0.0 % 0.0 to 100.0 %
16.3.2 End position guiding
The actuator stem moves to the end positions earlier if the end position guiding function is
active:
− 'End position guiding when the value falls below the limit'
The actuator stem moves to the 0 % position when the input signal falls below 'Value
below limit (end position guiding)'.
− 'End position guiding when the value exceeds the limit'
The actuator stem moves to the 100 % position when the input signal exceeds 'Value
above limit (end position guiding)'.
When 'End position guiding (stem extends)' = 0 % and 'End position guiding (stem retracts)'
= 100 %, the end positioning guiding function is deactivated.
Settings\Actuator\Functions
Functions WE Adjustment range
End position guiding (stem extends) 1.0 % 0.0 to 49.9 %
End position guiding (stem retracts) 97.0 % 50.0 to 100.0 %
Note