Samson 3730 Series, Mounting And Operating Instructions

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4.1 Direct attachment
4.1.1 Type 3277-5 Actuator
Refer to Table 1 on page 29 for the required
mounting parts as well as the accessories.
Note the travel table on page 13!
Actuator with 120 cm ²
Depending on the type of positioner attach-
ment, the signal pressure is routed either left
or right of the yoke through a bore to the
actuator diaphragm. Depending on the
fail-safe action of the actuator "Actuator
stem extends" or "Actuator stem retracts"
(valve closes or opens if the supply air fails),
the switchover plate (9) must first be at-
tached to the actuator yoke. Align the
switchover plate with the corresponding
symbol for left or right attachment according
to the marking (view looking onto the
switchover plate).
1. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
onto the positioner, making sure both
seal rings (6.1) are seated properly.
2. Remove screw plug (4) on the back of the
positioner and close the signal pressure
output (38) on the connecting plate (6) or
on the pressure gauge bracket (7) with the
stopper (5) included in the accessories.
3. Place follower clamp (3) on the actuator
stem, align and screw tight so that the
mounting screw is located in the groove
of the actuator stem.
4. Mount cover plate (10) with narrow side
of the cut-out opening (Fig. 4, on the left)
pointing towards the signal pressure
connection. Make sure that the bonded
gasket (14) points towards the actuator
yoke.
5. 15 mm travel: Keep the follower pin (2)
at lever M (1) on the back of the
positioner in the pin position 35 (deliv-
ered state).
7.5 mm travel: Remove the follower pin
(2) from the pin position 35 , reposition it
in the bore for pin position 25 and
screw tight.
6. Insert formed seal (15) into the groove of
the positioner housing and the seal ring
(10.1) on the back of the housing.
7. Place positioner on the cover plate (10)
in such a manner that the follower pin
(2) rests on the top of the follower clamp
(3). Adjust the lever (1) correspondingly
and open the positioner cover to hold
the positioner shaft in position at the cap
or the switch (Fig. 14).
The lever (1) must rest on the follower
clamp with spring force. Mount the
positioner on the cover plate (10) using
the two fixing screws.
Note for all types of attachment except for
direct attachment to Type 3277-5:
The sig-
nal pressure output at the back must be
sealed using the screw plug (4, order no.
0180-1254) and the associated O-ring (or-
der no. 0520-0412).
8. Mount cover (11) on the other side. Make
sure that the vent plug points downwards
when the control valve is installed to al-
low any condensed water that collects to
drain off.
14
EB 8384-1 EN
Attachment to the control valve – mounting parts and accessories