Samson 373 Series User Manual

46 EB 8384-2 EN
Mounting and start-up
5.3 Direct attachment
5.3.1 Type3277-5 Actuator
Î Requiredmountingpartsandaccesso-
ries:Table2onpage23.
Î Observetraveltablesonpage28.
Actuator with 120cm² (see Fig.6)
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. Depending on the fail-
safe action of the actuator "actuator stem ex-
tends" or "actuator stem retracts" (valve clos-
es or opens upon supply air failure), the swi-
tchoverplate(9)mustrstbeattached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
on the positioner, making sure the two
seals (6.1) are seated properly.
2. Removescrewplug(4)onthebackof
the positioner and seal the signal pres-
sure output (38) on the connecting plate
(6) or on the pressure gauge bracket (7)
with the stopper (5) included in the ac-
cessories.
3. 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.
4. Mount cover plate (10) with narrow side
ofthecut-out(Fig.6,ontheleft)pointing
towards the signal pressure connection.
Make sure that the gasket (14) points to-
wards the actuator yoke.
5. 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.
6. Insert formed seal (15) into the groove of
the positioner housing and insert the seal
(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
rotary pushbutton. The lever (1) must rest
on the follower clamp with spring force.
Mount the positioner on the cover plate
(10)usingthetwoxingscrews.
The following applies to all types of attach-
ment except for direct attachment to
Type3277-5: the signal pressure output at
the back must be sealed by the screw plug
(4, order no. 0180-1436) and the associat-
ed O-ring (order no. 0520-0412) (delivered
state, parts included in the scope of deliv-
ery).
8. Mount cover (11) on the other side.
Make sure that the vent plug is located at
the bottom when the control valve is in-
911
Supply 9 Output 38
5
6
4
7
6
10
10.1
3
2
1
15
6.1
1.1
1.2
14
8
Symbols
Actuator stem
extends
Actuator stem
retracts
Left attachment Rightattachment
Switchover plate (9)
Marking
Signal pressure
input for left
attachment
Signal pressure
input for right
attachment
Cut-out of
cover plate
NOTICE
!
Only use the connecting plate (6)
included in the accessories to connect
supply and output.
Never screw threaded parts directly
into housing.
1 Lever
1.1 Nut
1.2 Disk spring
2 Follower pin
3 Follower clamp
4 Screw plug
5 Stopper
6 Connecting plate
6.1 Seals
7 Pressure gauge bracket
8 Pressure gauge
mounting kit
9 Switchover plate
(actuator)
10 Cover plate
10.1 Seal
11 Cover
14 Gasket
15 Formed seal
Fig.6: Direct attachment – Signal pressure connection for Type 3277-5 Actuator with 120 cm²
Note

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English