Samson 3730-4, Original Instructions Manual

Page: 63 / 128

EB 8384-4 EN 63
Start-up and settings
For checking purposes: after successfully
completing initialization, the positioner dis -
play must read 0 % when the valve is closed
and 100 % when the valve is open. If this is
not the case, change the slide switch position
and re-initialize the positioner.
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 operation of
the positioner.
7.2 Adjusting the volume re-
striction Q
MAX BACK
MIN SIDE
MIN BACK
MAX SIDE
Q
Fig. 24: Volume restriction Q
MAX BACK/MIN SIDE setting
The volume restriction Q serves to adapt the
air output capacity to the size of the actua -
tor:
− Actuators with a transit time < 1 s , e.g.
linear actuators with an effective area
smaller than 240 cm², require a restrict -
ed air flow rate (MIN).
−
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 :
−
The SIDE position applies for actuators
with a signal pressure connection at the
side, e.g. Type 3271-5.
− The BACK position applies for actuators
with a signal pressure connection at the
back, e.g. Type 3277-5.
−
The SIDE restriction position always ap-
plies for actuators from other manufac-
turers.
Overview · Position of the volume restric-
tion 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 settings are not permitted.
Malfunction due to changed start-up settings.
Initialize an initialized positioner again after
the position of the volume restriction has
been changed.
7.3 Adapting the display direc-
tion
To adapt the reading on the display to the
mounting situation of the actuator, the dis-
play contents can be turned by 180°.
Note
NOTICE !