Samson 3731-5, Mounting And Operating Instructions

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30 EB 8387-5 EN
Mounting and start-up
5.3 Type 3277-5 Actuator
Î
Required mounting parts and accesso-
ries: Table 1 on page 17.
Actuator (120 cm²)
If a solenoid valve or similar is additionally
mounted to the actuator, observe the follow-
ing instructions which differ from the instruc-
tions otherwise described:
Î
The switchover plate (9) is not used in
this case.
Î
The signal pressure must be transmitted
from the signal pressure output to the ac-
tuator over an additional connecting
plate (accessories, order no. 1400-
6820).
Î
Do not remove the screw plug (4) on the
back.
Depending on the type of positioner attach-
ment, the signal pressure is routed either left
or right of the yoke through a hole to the ac-
tuator diaphragm.
1. Refer to Fig. 5 to select the symbol to
match the required fail-safe position and
how the positioner is attached:
Fail-safe action:
Actuator stem extends = Fail-close
Actuator stem retracts = Fail-open
Positioner attachment: left or right with
view looking onto the switchover plate
2. Align the marking of the switchover plate
(9) to the corresponding symbol and
mount the plate on the actuator yoke.
3. Mount connecting plate (6) for required
G ¼ connecting thread or pressure
gauge bracket (7) with pressure gauges
on the positioner, making sure the two
seals (6.1) are seated properly.
4. Remove screw plug (4) on the back of
the positioner and seal the signal pres-
sure output (38) at the positioner (or at
the pressure gauge bracket (7) or con-
necting plate (6)) with the stopper (5) in-
cluded in the accessories.
5. Place follower clamp (3) on the actuator
stem, align it and screw tight so that the
mounting screw is located in the groove
of the actuator stem.
6. Mount cover plate (10) with narrow side
of the cut-out (Fig. 5, on the left) pointing
towards the signal pressure connection.
Make sure that the gasket (14) points to-
wards the actuator yoke.
7. 15 mm travel: keep the follower pin (2)
on the M lever (1) on the back of the po-
sitioner in the pin position 35 (delivered
state).
7.5 mm travel: remove the follower pin
(2) from the pin position 35, reposition it
in the hole for pin position 25 and screw
tight.
8. Insert the formed seal (15) into the
groove of the positioner enclosure, press-
ing the four retaining rings over the en-
closure screws and both fittings into the
enclosure recesses.
9. Thread the bias spring (17) through the
crosspiece underneath the lever (1) and
push it into the hole in the enclosure.
Push the lever (1) until it engages into
place. Place the positioner on the cover
plate (10) and fasten it using the three
9 11
Supply 9
Output 38
5
6
4
17
7
6
10
10.1
3
2
1
15
6.1
1.1
1.2
14
8
11.1
A
A-A
A
Actuator stem
Symbols
Actuator stem
Switchover plate (9)
Marking
Left attachment
Signal pressure input
for left attachment
Signal pressure
input for right
attachment
Right attachment
extends
retracts
1 Lever
1.1 Nut
1.2 Disk spring
2 Follower pin
3 Follower clamp
4 Screw plug
5 Stopper
6 Connecting plate for G ¼
6.1 Seals
7 Pressure gauge bracket
8 Pressure gauge mounting
kit
9 Switchover plate (actuator)
10 Cover plate
10.1 Seal
11 Cover
11.1 Vent plug
14 Gasket
15 Formed seal
17 Bias spring (only with direct
attachment)
Cut-out of
cover plate
Fig. 5: Direct attachment for Type 3277-5 Actuator (120 cm²)