Note: The switch position is prompted prior
to an initialization. After an initialization
has been completed, changing the switch
position does not have any effect on the op
-
eration of the positioner.
The positioner only needs to be initialized
again after the fail-safe action of the actua
-
tor has been changed.
7.2 Setting the volume restriction
Q
The volume restriction Q is used to adapt the
air delivery to the size of the actuator:
4
Actuators with a transit time < 1 s, e.g.
linear actuators with an effective area
smaller than 240 cm², require a re
-
stricted air flow rate (MIN).
4
Actuators with a transit time
≥
1 s do not
require the air flow rate to be restricted
(MAX).
The position of volume restriction Q also de
-
pends on how the signal pressure is routed
at the actuator in SAMSON actuators:
4
The “SIDE“ position applies for actuators
with a loading pressure connection at the
side, e.g. Type 3271-5.
4
The “BACK“ position applies for actua
-
tors with a loading pressure connection
at the back, e.g. in Type 3277-5.
4
The “SIDE”restriction position always ap
-
plies for actuators from other manufac
-
turers.
Overview · Position of volume restriction Q*
Signal
pressure
Transit
time < 1 s
≥
1 s
Connection at the side MIN SIDE MAX SIDE
Connection at the back MIN BACK MAX BACK
* Intermediate positions are not permitted.
NOTICE
The positioner needs to be initialized again
after the position of the restriction has been
changed.
7.3 Adapting the display
The data representation on the positioner
display can be turned by 180° to adapt it to
how the positioner is mounted.
Reading direction for right
attachment of pneumatic
connections
Reading direction for left
attachment of pneumatic
connections
If the displayed data appear upside down,
proceed as follows:
EB 8384-5 EN 53
Start-up – Settings
MAX BACK
MIN SIDE
MIN BACK
MAX SIDE
Q
Fig. 21 · Volume restriction Q
MAX BACK/MIN SIDE setting
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