Mounting The Lever With Feeler Roll; Mounting The Intermediate Piece - Samson 3767 Mounting And Operating Instructions

Mounting on control valves
The rotary motion of these actuators is con-
verted into a linear motion required by the
pneumatic control unit of the positioner using
the cam disk of the actuator shaft and a feel-
er roll on the positioner lever.
NOTICE
Check whether the correct range
spring has been installed as listed in
Table 7. Range spring 1 is installed
as standard. If necessary, replace it
with range spring 2 included in the
accessories and fix it at the outer
hook-in holes.
Double-acting springless rotary actuators re-
quire the use of a reversing amplifier on the
connection side of the positioner housing
(see section 3.3.4).
When using a reversing amplifier, the pres-
sure regulator (9, Fig. 2) must be turned
clockwise as far as it will go (also see sec-
tion 4.1.2).
When attaching the positioner to the
SAMSON Type 3278 Rotary Actuator
(Fig. 8, left), the inside of the actuator and
the unused reverse side of the diaphragm
are purged with the positioner's exhaust air.
Additional piping is not required.
When attaching the positioner to actuators
from other manufacturers (Fig. 8, right), the
reverse side of the diaphragm can be
purged with air over a pipe connection in-
stalled between the actuator and intermedi-
ate piece.
26
3.3.1 Mounting the lever with
feeler roll
1. Place the lever with feeler roll (35) on the
side of the lever (37) opposite to where
the press nuts are located and secure it
using the supplied screws (38) and
washers.
NOTICE
To ensure a close physical contact be-
tween the lever with feeler roll and the
cam disk, attach the spring contained
in the accessories kit (order no. 1400-
6660) to the back of the positioner
housing (see Fig. 5).
3.3.2 Mounting the interme-
diate piece
SAMSON Type 3278 Actuator
1. Fasten the adapter (36) to the free shaft
end of the rotary actuator.
2. Fasten the intermediate piece (34) to the
actuator housing using two screws. Align
the intermediate piece so that the air con-
nections of the positioner point toward the
diaphragm case side.
3. Align the cam disk (40) and scale (39) as
described in section 3.3.3 and fasten.
Actuators according to VDI/VDE 3845
(09/2010) (fixing level 2)
1. Place the assembled intermediate piece
(34, 44, 45 and 42) onto the mounting
bracket included in the scope of actuator
delivery and fasten.
2. Align the cam disk (40) and scale (39)
as described in section 2.3.3 and fasten.
EB 8355-2 EN