Samson 3767 - Page 27

EB 8355-2 EN 5-3
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-
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)