Samson 5857 - Manual and Advanced Operation; Manual Mode Operation

8-4 EB 5857 EN
Operation
8.3 Manual mode
The actuator stem can be moved mechanically or electrically. Travel and direction of action
can be read off the scale of the travel indicator.
8.3.1 Mechanical override
Handwheel
Travel indicator
Direction Actuator stem
Extends
Retracts
Fig.8-2: Mechanical override
Direction of rotation
− Turnclockwise:theactuatorstemextends(seeFig.8-2).
− Turncounterclockwise:theactuatorstemretracts(seeFig.8-2).
The positioning of the valve is affected when the handwheel (version with positioner) is oper-
ated while the process is running. As a result, zero point and the position feedback do not
match the calibrated values. Zero calibration, initialization or a transit time measurement
must be performed again.
Note