Samson 3730-2 Mounting And Operating Instructions page 54

Start-up and settings
Turn until the valve reaches its OPEN po-
sition. Press .
4
Press INIT key to start initialization.
The initialization procedure may
take several minutes, depending on
the actuator size, as the valve moves
through its entire travel/angle of ro-
tation range.
Positioners with EXPERT
tions automatically start plotting the refer-
ence graphs after the initialization process
has been completed (see note at the bottom
of page 50).
SUb
(substitute configuration, without initializa-
tion)
This initialization mode is an emergency
mode. The positioner parameters are esti-
mated and not determined by an initializa-
tion procedure, so that a high stationary ac-
curacy cannot be expected.
Always select a different initialization mode
if the plant permits it.
The initialization mode SUb is used to re-
place a positioner while the process is in op-
eration. For this purpose, the control valve is
usually fixed mechanically in a certain posi-
tion, or pneumatically by means of a pres-
sure signal which is routed to the actuator
externally. The blocking position ensures
54
EB 8384-2 EN
+ diagnostic func-
that the plant continues to operate with this
valve position.
The spare positioner should not be initial-
ized. If necessary, reset the spare positioner
using Code 36 .
After the old positioner has been replaced
with a new one, the following parameters
must be entered: pin position (Code 4 ),
nominal range (Code 5 ), direction of action
(Code 7 ) and closing direction (Code 34 ).
The default travel limit of 100 % (Code 11 )
must be disabled with OFF .
In addition, the blocking position (Code 35 )
must be adjusted with the
it matches the position of the previously
blocked valve.
The parameters K
P
and the pressure limit (Code 16 ) should re-
main set to their default values. If the config-
uration data of the new positioner are
known, it is recommended to accept its K
and T values.
V
After setting the AIR TO OPEN/CLOSE
switch for the fail-safe position, setting the
volume restriction and pressing the INIT key,
the positioner calculates its configuration
data on the basis of the blocking position
and the closing direction as well as the other
entered data.
The positioner switches to manual operation,
subsequently the blocking position is to be
canceled as described on page 56.
button so that
(Code 17 ), T (Code 18 )
V
P