52
EB 8384-6S EN
Mounting and start-up
5.5 Attachment according to
VDI/VDE 3847-1
TROVIS SAFE 3730-6-xxx0xxxx0x0060xx
and TROVIS SAFE Positioners with air purg
-
ing of the actuator's spring chamber can be
attached according to VDI/VDE 3847-1.
TROVIS SAFE 3730-6-xxx0xxxx0x0000xx
Positioner without air purging of the actua-
tor's spring chamber can be attached ac-
cording 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.
Î
Required mounting parts and accesso
-
ries: see Table 5
Mount the positioner on the yoke as shown
in Fig. 9. 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 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 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 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
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 plate
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 Gasket
13
Adapter block
13.1 Screws
14
Bolt
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 to Type 3277 Actuator
Note
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