Samson 3780 series, Mounting And Operating Instructions

Page: 16 / 76

7. Mount the positioner so that the hole in
the distance plate (15) matches the seal
located in the hole of the actuator yoke.
8. Align the switchover plate with the
corresponding symbol for left attach-
ment according to the marking and
screw tight onto the actuator yoke.
Important!
If, with the 120 cm 2 actuator in addition to
the positioner, a solenoid valve or a similar
device is attached to the actuator, do not
remove the rear M3 screw. In this case, the
signal pressure has to be fed from the sig-
nal pressure output to the actuator via the
required connecting plate (see Table 2). The
switchover plate is not used.
Note!
For quick-acting control valves (transit time
< 0.6 s), it is necessary to replace the filter
installed in the output pressure bore (Output
38) with a screw-in throttle (accessories spe-
cified in Table 3).
Filling the spring chamber with air
If the spring chamber of the Type 3277 Ac-
tuator must be filled with the air exhausted
from the positioner, the spring chamber (ver-
sion "Actuator stem extends") can be con-
nected to the connection block by means of
a tube (see Table 3). To proceed, remove
the venting plug in the connection block.
In Type 3277-5 when "Actuator stem re-
tracts" the exhausted air from the positioner
is constantly applied to the spring chamber
through an internal hole.
16
EB 8380-1 EN
Attachment to the control valve
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