Samson TROVIS 3730-3 Mounting And Operating Instructions page 50

Installation
Attachment to Type 3277 Actuator (see
Fig. 5-12)
Î Required mounting parts and accesso-
ries: Table 5-8 on page 5-51.
Mount the positioner on the yoke as shown
in Fig. 5-12. 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. Seal the signal pressure output at the
back of the positioner with the screw
plug (4, order no. 0180-1254) and the
associated O-ring (order no. 0520-
0412) if the screw plug is not yet in
place.
2. 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.
3. 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.
4. 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
5-14
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.
5. Insert the molded seal (6.2) in the groove
of the adapter bracket (6).
6. Insert the molded seal (17.1) into the
turnboard (17) and mount the turnboard
to the adapter block (13) using the
screws (17.2).
7. Mount the blank plate (18) to the turn-
board (17) using the screws (18.1).
Make sure that the seals are correctly
seated.
Note
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).
8. Insert the screws (13.1) through the mid-
dle holes of the adapter block (13).
9. Place the connecting plate (12) together
with the seal (12.1) onto the screws
(13.1) corresponding to the fail-safe ac-
tion "actuator stem extends" or "actuator
stem retracts". The fail-safe action that
applies is determined by aligning the
groove of the adapter block (13) with the
groove of the connecting plate (12)
(Fig. 5-13).
EB 8484-3 EN