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8.3.1
Mechanical override
Travel indication
Handwheel (only version
scale
without fail-safe action)
Direction
Fig. 8-2: Handwheel and travel indicator
Direction of rotation
− Turn clockwise: the actuator stem extends
(see Fig. 8-2).
− Turn counterclockwise: the actuator stem
retracts (see Fig. 8-2).
Actuator without fail-safe action
To manually move the actuator stem one
millimeter, the handwheel must be turned
approx. 4 turns (see Fig. 8-2):
EB 5827-2 EN
Actuator stem
Extends
Retracts
Note
The positioning of the valve is affected when
the handwheel is operated while the process
is running. As a result, zero point and the
position feedback do not match the calibrat-
ed values. Zero calibration, initialization or
a transit time measurement must be per-
formed again.
Actuator with fail-safe action
The front housing cover must be opened be-
fore manually adjusting the actuator stem.
The stem can be moved manually one milli-
meter by turning the actuating shaft approx.
4 turns using an Allen key.
NOTICE
!
Specified degree of protection does not ap-
ply when the housing cover is open.
Î Ensure that no moisture or foreign parti-
cles can get into the actuator.
DANGER
!
Risk of electric shock from exposed live
parts.
Î Do not touch live parts on operating the
manual override.
1. Unfasten the front housing cover and
place a 4 mm Allen key on the red actu-
ating shaft.
Operation
8-3
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