NOTICE
Use the correct range spring (1 or 2)!
Range spring 1 is installed as standard.
Double-acting springless rotary actuators re
-
quire the use of a reversing amplifier on the
connection side of the positioner housing
(see section 2.3.4).
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 3.1.2).
When attaching the positioner to the
SAMSON Type 3278 Rotary Actuator
(Fig. 8, left), the actuator's inside and the
unused reverse side of the diaphragm are
filled with the positioner's exhaust air. Addi-
tional piping is not required. When attach-
ing the positioner to actuators from other
manufacturers (Fig. 8, right), the reverse
side of the diaphragm can be filled with air
over a pipe connection installed between the
actuator and the intermediate piece.
2.3.1 Mounting the cam follower
lever
1. Place the lever with the cam follower roll
(35) on the side of the feedback lever
(37) opposite the insert nuts. Fasten with
the supplied screws (38) and washers.
NOTICE
To ensure a close physical contact between
the cam follower roll and the cam disk, fix
the spring contained in the accessories kit
(order no. 1400-6660) at the back of the
positioner housing (see Fig. 5).
2.3.2 Mounting the intermediate
piece
SAMSON Type 3278 Actuator
1. Screw the adapter (36) to the free end of
the actuator shaft.
2. Attach the intermediate piece (34) to the
actuator housing using two screws.
Align the intermediate piece to ensure
that the air connections of the positioner
point towards the diaphragm housing.
3. Align the cam disk (40) and scale (39)
as described in section 2.3.3 and fasten
with screws.
Actuators according to VDI/VDE 3845
(fixing level 1)
1. Place the complete intermediate piece
(34, 44, 45 and 42) onto the mounting
bracket that came with the actuator and
fasten with screws.
2. Align the cam disk (40) and scale (39)
as described in section 2.3.3 and fasten
with screws.
20 EB 8355-1 EN
Attachment to control valve
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