Samson 3730 Series, Mounting And Operating Instructions

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4.5 Attachment to rotary
actuators
The positioner is mounted to the rotary actu-
ator using two pairs of double brackets.
Refer to Table 4 on page 31 for the required
mounting parts as well as the accessories
with their order numbers.
Prior mounting the positioner to the
SAMSON Type 3278 Rotary Actuator, you
have to mount the associated adapter (5) to
the free end of the rotary actuator shaft.
NOTICE
During the installation of the positioner as
described below, it is imperative that the ac-
tuator's direction of rotation be observed.
1. Place follower clamp (3) on the slotted
actuator shaft or the adapter (5).
2. Place coupling wheel (4) with flat side
facing the actuator on the follower
clamp (3). Refer to Fig. 9 to align slot so
that it matches the direction of rotation
when the valve is in its closed position.
3. Screw coupling wheel and follower
clamp tightly onto the actuator shaft us-
ing the screw (4.1) and disk spring
(4.2).
4. Screw the bottom pair of brackets (10.1)
with the bends pointing either to the in-
side or to the outside (depending on the
actuator size) to the actuator case. Posi-
tion top pair of brackets (10) and screw
tight.
5. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
to the positioner, making sure both
O-rings are seated properly.
For
double-acting
, springless rotary ac-
tuators, a reversing amplifier is required
to attach the positioner to the actuator,
see section 4.6.
6. Unscrew the standard follower pin (2)
from the positioner's lever M (1). Use the
metal follower pin (Ø 5) included in the
accessories and screw tight into the bore
for pin position
90 °.
7. Place positioner on the top pair of
brackets (10) and screw tight. Con-
sidering the actuator's direction of rota-
tion, adjust lever (1) so that it engages in
the slot of the coupling wheel (4) with its
follower pin (see Fig. 9). It must be guar-
anteed that the lever (1) is parallel to the
long side of the positioner when the ac-
tuator is at half its angle of rotation.
8. Stick scale plate (4.3) on the coupling
wheel so that the arrow tip indicates the
closed position, and it can be easily
read when the valve is installed.
22
EB 8384-1 EN
Attachment to the control valve – mounting parts and accessories
1.2
1.1
1
2
4.1
4.2
5
3
Fig. 8 · Mounting the coupling wheel with Type 3278
Actuator flange