Samson 5827, Монтаж и эксплуатация, Страница: 45 / 92

EB 5827-2 EN 8-3
Operation
8.3.1 Mechanical override
Direction Actuator stem
Extends
Retracts
Travel indication
scale
Handwheel (only version
without fail-safe action)
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 ):
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.
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.
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.
Note
NOTICE !
DANGER !