Samson 3766 - Mounting on Control Valves; Direct Attachment to Type 3277 Actuator

14 EB 8355-1 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.2,Fig.3andFig.5.
Theturnboard(7inFig.1)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.
When any subsequent changes are made,
e.g. reversing the operating direction of the
positioner control loop or changing the actu-
ator fail-safe action from “actuator stem ex-
tends” to “actuator stem retracts” or vice ver-
sa, the positioner's mounting position must
be changed accordingly.
3.1 Direct attachment to
Type3277 Actuator
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 <>.
NOTICE
!
Note