Samson 3767 - Mounting on Control Valves; Direct Attachment to Type 3277 Actuator

14 EB8355-2EN
Mountingoncontrolvalves
3 Mountingoncontrolvalves
Thepositionercanbemountedeitherdirectly
toSAMSONType3277Actuatorortocon-
trolvalveswithcastyokesorrod-typeyokes
accordingtoIEC60534-6(NAMUR).
Combinedwithanintermediatepiece,the
positionercanalsobemountedonrotary
actuators. The standard positioner is deliv-
ered without accessories. Any additionally
required accessories are listed together with
theirordernumbersinthefollowingtables.
Do not remove the protective cover on the
backofthepositioneruntilyouactuallystart
to attach the positioner.
Mountingpositionandoperatingdirection
The operating direction of the positioner also
determines its mounting position on the actu-
atorasillustratedinFig.3,Fig.4andFig.6.
Theturnboard(7inFig.2)atthepositioner
mustbemountedcorrespondingly.
For an increasing input signal (reference
variable),thesignalpressurep
st
can either
beincreasing(directaction>>)ordecreas-
ing(reverseaction<>).Similarly,astheref-
erencevariabledecreases,thesignalpres-
surecaneitherdecrease(directaction>>)or
increase(reverseaction<>).
Ontheturnboard(7),theoperatingdirection
isindicatedbysymbols(direct>>,reverse
<>).Dependingonthepositionoftheturn-
board,theadjustedoperatingdirectionand
theassociatedsymbolbecomevisible.
If the required operating direction does not
correspondtothevisiblesymbol,orifyou
want to change the operating direction, re-
movethefasteningscrewattheturnboard,
turntheboardby180°andrefastenthe
turnboard.Makesurethethreerubbergas-
kets inserted in the housing remain in posi-
tion.
NOTICE
When any subsequent changes are
made, e.g. reversing the operating
direction of the positioner control
loop or changing the actuator fail-
safe action from “actuator stem
extends” to “actuator stem retracts”
or vice versa, the positioner's
mounting position must be changed
accordingly.
3.1 Directattachmentto
Type3277Actuator
Note:
The required accessories are listed in
Table1 to Table4 on page18.
The attachment of the positioner either on the
left or right side of the actuator (always look-
ing onto the signal pressure connection or
switchoverplate)isdeterminedbythere-
quired operating direction of the positioner,
i.e. >> or <>.
