Samson 373 Series User Manual

52 EB 8384-2 EN
Mounting and start-up
5.5 Attachment according to
VDI/VDE3847-1
TheType3730-2xxx0xxxx0x0060xxand
Type3730-2xxxxxxx0xx0700Positioners
with air purging of the actuator's spring
chambercanbeattachedaccordingtoVDI/
VDE3847.
TheType3730-2xxx0xxxx0x0000xxPosi-
tioner 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.9)
Î Requiredmountingpartsandaccesso-
ries:Table5onpage25.
Mount the positioner on the yoke. The signal
pressure is routed to the actuator over the
connecting plate (12), for actuators with fail-
safe action "actuator stem extends" internal-
ly through a bore in the valve yoke and for
"actuator stem retracts" 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.
Foractuators175,240and350cm²
with15mmtravel,keepthefollowerpin
(2) in pin position 35.
4. Insert the formed seal (6.2) in the groove
of the adapter bracket (6).
5. Insert the formed seal (17.1) into the
turnboard (17) and mount the turnboard
to the adapter block (13) using the
screws (17.2).
6. Mount the blank plate (18) to the turn-
board (17) using the screws (18.1).
Make sure that the seals are correctly
seated.
A solenoid valve can also be mounted in
place of the blank plate (18). The orientation
of the turnboard (17) determines the mount-
ing position of the solenoid valve. Alterna-
tively, a restrictor plate can be mounted
(uAB11).
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 Formed 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 Formed seal
17.2 Screws
18 Dummy plate
18.1 Screws
19 Air blocker
20 Retainingscrew
Fig.9: Attachment according to VDI/VDE3847-1 onto Type3277 Actuator
Note

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English