Samson 3767 - Mounting the Lever with Feeler Roll; Mounting the Intermediate Piece

26 EB8355-2EN
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 x it at the outer
hook-in holes.
Double-actingspringlessrotaryactuatorsre-
quire the use of a reversingamplier on the
connection side of the positioner housing
(seesection3.3.4).
Whenusingareversingamplier,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.
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)(xing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.