Samson 4763 - Page 25

EB 8359-2 EN 5-3
Installation
5.2 Preparation for installation
Before mounting, make sure the following
conditions are met:
− The positioner is not damaged.
− The air supply is not yet connected to the
positioner.
− The current is not yet connected to the
positioner.
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 Determine on which side of the valve the
positioner is to be mounted (see sec-
tion5.2.2).
Î Remove the protective caps from the
pneumatic connections.
5.2.1 Determining the oper-
ating 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
Range spring
Feeler pin
Cover plate
Nozzle block
Marking Flapper plate
Operating direction <<
Flapper plate below the feeler pin
Operating direction <>
Flapper plate on top of feeler pin
Fig.5-1: Position of nozzle block, cover plate removed
Actuator stem extends (FA)
1
20
p
st
w
1
20
p
st
w
Lever (1) located at top of plate (20) Lever (1) located at bottom of plate (20)
Fig.5-2: Operating direction << Left attachment Fig.5-3: Operating direction <> Right
attachment
Actuator stem retracts (FE)
p
st
w
p
st
w
Lever (1) located at bottom of plate (20) Lever (1) located at top of plate (20)
Fig.5-4: Operating direction << Right
attachment
Fig.5-5: Operating direction <> Left
attachment