Determining The Operating Direction Of The Positioner Control Loop; Positioner Attachment; Direct Attachment To Type 3277 Actuator - Samson 3767 Translation Of Original Instructions

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
signal p (set point) rises
e
− The signal pressure p
input signal p (set point) decreases
e
Operating direction increasing/decreasing
<>
− The signal pressure p
input signal p (set point) rises
e
− The signal pressure p
signal p (set point) decreases
e
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-
5-2
rises as the input
st
decreases as the
st
decreases as the
st
rises as the input
st
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.
EB 8355-2 EN