Samson 3730 Series, Mounting And Operating Instructions

Page: 41 / 72

The signal pressure is the air pressure at the
output of the positioner, which is applied to
the actuator.
AIR TO OPEN/ATO is always used with
positioners fitted with a reversing amplifier
for double-acting actuators (connections de-
scribed in section 4.6)
Default ATO
Turn until Code P2 appears.
Press to confirm P2 . P2 blinks.
Turn until the required fail-safe position
appears.
Press to confirm the setting.
7.4 Setting other parameters
The following table lists all the parameter
codes and their default settings.
If you want to change the default setting of a
parameter, proceed in the same manner as
previously described.
More details concerning the parameter
codes can be found in section 8.
7.5 Initialization
During initialization the positioner adapts it-
self optimally to the friction conditions and
the signal pressure demand of the control
valve.
The type and extent of self-adaptation de-
pends on the preset parameters.
MAX
is the default setting for the nominal
range (Code
P4
). During the initialization
process, the positioner determines the
travel/rotational angle of the closing ele-
ment from the CLOSED position as far as it
will go in the other direction.
EB 8384-1 EN
41
Start-up
Parameter codes Codes marked with * can be changed without having to re-initialize the positioner
[...] Default setting
P0 Display with status indication P9 * Pressure limit 2.4 bar [OFF]
P1 * Reading direction P10 * End position w < [ON]
P2 Fail-safe position [ATO] / ATC P11 * End position w > [OFF]
P3 Pin position [35] P12 * Limit value A1 switching threshold [2 %]
P4 Nominal range [MAX] P13 * Limit value A2 switching threshold [98 %]
P5 * Characteristic [1] P14 Display of reference variable w
P6
* Reference variable [4...20 mA]
P15
INIT Start initialization
P7
* w/x direction of action [>>]
P16
* ZERO Start zero calibration
P8 Gain K
P
[50]