Samson 3730-0 Mounting And Operating Instructions - 4.1 Direct Attachment
14
EB 8384-0 EN
Attachment to the control valve – Mounting parts and accessories
4.1 Direct attachment
4.1.1 Type 3277-5 Actuator
Refer to Table 3 on page 31 for the re-
quired mounting parts and accessories listed
with their order numbers.
Refer to travel table on page 13.
Actuator with 120 cm²
Dependingonthetypeofpositionerattach-
ment,thesignalpressureisroutedeitherleft
orrightoftheyokethroughaholetotheac-
tuatordiaphragm.Dependingonthefail-safe
actionoftheactuator"Actuatorstemextends"
or"Actuatorstemretracts"(valveclosesor
opensifthesupplyairfails),theswitchover
plate(9)mustfirstbemountedtotheactuator
yoke.Aligntheswitchoverplatewiththecor-
respondingsymbolforleftorrightattachment
accordingtothemarking(viewlookingonto
theswitchoverplate).
1. Mountconnectingplate(6)orpressure
gaugebracket(7)withpressuregauges
ontothepositioner,makingsurethetwo
seals(6.1)areseatedproperly.
2. Removescrewplug(4)onthebackof
thepositionerandsealthesignalpres-
sureoutput(Output38)ontheconnect-
ingplate(6)oronthepressuregauge
bracket(7)withthestopper(5)included
intheaccessories.
3. Placefollowerclamp(3)ontheactuator
stem,alignandscrewtightsothatthe
mountingscrewislocatedinthegroove
oftheactuatorstem.
4. Mountcoverplate(10)withnarrowside
ofthecut-outopening(Fig. 3,ontheleft)
pointingtowardsthesignalpressurecon-
nection.Makesurethatthebondedgas-
ket(14)pointstowardstheactuatoryoke.
5. 15 mm travel:Keepthefollowerpin(2)
onleverM(1)onthebackoftheposi-
tionerinthepinposition35(delivered
state).
7.5 mm travel:Removethefollowerpin
(2)fromthepinposition35,repositionit
intheholeforpinposition25andscrew
tight.
6. Insertformedseal(15)intothegrooveof
thepositionerhousingandinserttheseal
(10.1)onthebackofthehousing.
7. Placepositioneronthecoverplate(10)
insuchamannerthatthefollowerpin
(2)restsonthetopofthefollowerclamp
(3).Adjustthelever(1)correspondingly
andopenthepositionercovertoholdthe
positionershaftinpositionatthecap.
Thelever(1)mustrestonthefollower
clampwithspringforce.
Mountthepositioneronthecoverplate
(10)usingthetwofixingscrews.
Note applying to all types of attach-
ment except for direct attachment to
Type 3277-5:
The signal pressure output at the back
must be sealed by the screw plug (4,
order no. 0180-1254) and the associ-
ated O-ring (order no. 0520-0412).
8. Mountcover(11)ontheotherside.Make
surethattheventplugislocatedatthe
bottomwhenthecontrolvalveisinstalled
toallowanycondensedwaterthatcol-
lectstodrainoff.