Manual Mode; Mechanical Override - Samson 5857 Mounting And Operating Instructions

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

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).
Note
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.
8-4
Direction Actuator stem
Extends
Retracts
Travel indicator
Handwheel
EB 5857 EN