Samson 3767 - Determining the Operating Direction of the Positioner Control Loop; Positioner Attachment; Direct Attachment to Type 3277 Actuator

5-2 EB 8355-2 EN
Installation
Proceedasfollows:
Î Lay out the necessary material and tools
tohavethemreadyduringmounting.
Î Determine the operating direction of the
positioner control loop (see sec-
tion5.2.1).
Î Remove the protective cover on the back
of the positioner.
Î Remove the protective caps from the
pneumatic connections.
5.2.1 Determining the
operating direction of
the positioner control
loop
Operating direction increasing/increasing
<<
− The signal pressure p
st
rises as the input
signal p
e
(set point) rises
− The signal pressure p
st
decreases as the
input signal p
e
(set point) decreases
Operating direction increasing/decreasing
<>
− The signal pressure p
st
decreases as the
input signal p
e
(set point) rises
− The signal pressure p
st
rises as the input
signal p
e
(set point) decreases
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 is visible. If the re-
quired operating direction does not corre-
spond to the visible symbol or if the operat-
ing direction is to be changed, proceed as
follows:
Î Unscrew the fastening screw from the
turnboard.
Î Turntheturnboardby180°.Makesure
that the three rubber gaskets inserted in
the housing remain in position.
Î Fasten the turnboard.
5.3 Positioner attachment
5.3.1 Direct attachment to
Type3277 Actuator
Î Required mounting parts and accesso-
ries:section5.8
Î See Fig.5-2
The positioner is mounted on the left or right
side of the valve depending on the actuator's
direction of action (fail-safe action) and the
operating direction of the positioner control
loop (see Fig.5-1, top).
1. Fasten the clamp (1.2) to the actuator
stem, making sure that the fastening
screw rests in the groove of the actuator
stem.
2. Fasten the associated pick-up lever D1 or
D2(with355/700cm²actuators)tothe
feedback lever of the positioner.
3. Secure the intermediate plate (15) with
the gasket facing towards the actuator
yoke.
SUPPLY
Actuator stem extends
Actuator stem retracts
Internal signal pres-
sure connection
Side view of connection block
Signal pressure
connection over piping
Connection block
Tip of gasket (16)
Operating
direction>>Left
attachment
Operating
direction<>Left
attachment
With gasket (new)
With switch plate (old)
Switch plate (13)
Gasket (16)
Cover
Switchover plate
Signal pressure input
Signal pressure
input for left
attachment
Seal with
lter
With right
attachment
Marking
Marking
Symbol
Actuator stem extends
Actuator stem retracts
Operating
direction<>Right
attachment
Actuator stem extends
>>Operatingdirection<>
Left attachment Right attachment
Actuator stem retracts
<>Operatingdirection>>
Left attachment Right attachment
Operating
direction>>Right
attachment
Fig.5-1: Mounting position and connection of signal pressure for Type3277 Actuator (top) and
Type3277-5 Actuator (120cm²) (bottom)