Samson 3730 Series - Attachment According to VDI;VDE 3847-1

5-12 EB 8384-3 EN
Installation
5.5.3 Attachment according to
VDI/VDE3847-1
The 3730-3-xxx0xxxx0x0060xx and
3730-3-xxx0xxxx0x007000 Positioners with
air purging of the actuator's spring chamber
canbeattachedaccordingtoVDI/
VDE3847-1.
The 3730-3-xxx0xxxx0x0000xx Positioner
without air purging of the actuator's spring
chambercanbeattachedaccordingtoVDI/
VDE3847.
This type of attachment allows the positioner
to be replaced quickly while the process is
running by blocking the air in the actuator.
The signal pressure can be blocked in the ac-
tuator by unscrewing the red retaining screw
(20) and turning the air blocker (19) on the
bottom of the adapter block.
Attachment to Type 3277 Actuator (see
Fig.5-8)
Î Required mounting parts and accesso-
ries:seeTable5-8
Mount the positioner on the yoke as shown
in Fig.5-8. The signal pressure is routed to
the actuator over the connecting plate (12),
for actuators with fail-safe action "actuator
stem extends" internally through a bore in
the valve yoke and for "actuator stem re-
tracts" through external piping.
Only the Y1 port is required for positioner
attachment. The Y2 port can be used for air
purging of the spring chamber.
1. 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.
2. Place the adapter bracket (6) on the po-
sitioner and mount using the screws
(6.1). Make sure that the seals are cor-
rectly seated. For positioners with air
purging, remove the stopper (5) before
mounting the positioner. For positioners
without air purging, replace the screw
plug (4) with a vent plug.
3. Foractuatorswith355,700or750cm²,
remove the follower pin (2) on the M le-
ver (1) on the back of the positioner from
pin position 35, reposition it in the hole
for pin position 50 and screw tight.
Whiledoingso,holdtheleverinthe
middle to ensure that it does not rest at
the end stops.
Foractuators175,240and350cm²
with15mmtravel,keepthefollowerpin
(2) in pin position 35.
4. Insert the molded seal (6.2) in the groove
of the adapter bracket (6).
5. Insert the molded seal (17.1) into the
turnboard (17) and mount the turnboard
to the adapter block (13) using the
screws (17.2).
6. Mountthedummyplate(18)totheturn-
board(17)usingthescrews(18.1).
Make sure that the seals are correctly
seated.
18.1
1
17.2
18
17
17.1
13.1
13
12
12.1
3
11.1
11
19
20
Exh.
1.1
1.2
1.1
1.2
1
2
6.2
6.1
6
4
6.3
5
1 Lever
1.1 Nut
1.2 Disk spring
2 Follower pin
3 Follower clamp
4 Screw plug
5 Stopper
6 Adapter bracket
6.1 Screws
6.2 Molded seal
6.3 Screws
11 Cover
11.1 Ventplug
12 Connecting plate
12.1 Seal
13 Adapter block
13.1 Screws
17 Turnboard
17.1 Molded seal
17.2 Screws
18 Dummy plate
18.1 Screws
19 Air blocker
20 Retaining screw
Fig.5-8: Attachment according to VDI/VDE3847 onto Type3277 Actuator