Samson 3730-4, Original Instructions Manual

Page: 10 / 128

10 EB 8384-4 EN
Design and principle of operation
The positioner communicates and is powered
using IEC 61158-2 transmission technology
conforming to PROFIBUS-PA specifications.
As a standard feature, the positioner comes
with a binary input for DC voltage signals to
signalize process information over the
PROFIBUS-PA network.
The extended
EXPERTplus diagnostics are in -
tegrated into the positioner. They provide in-
formation on the positioner and generate di-
agnostic and status messages, which allow
faults to be pinpointed quickly.
The positioner is suitable for the following
types of attachment using the corresponding
accessories:
− Direct attachment to SAMSON
Type 3277 Actuators
− Attachment to actuators according to
IEC 60534-6 (NAMUR)
− Attachment according to VDI/VDE 3847
− Attachment to Type 3510 Micro-flow
Valve
− Attachment to rotary actuators according
to VDI/VDE 3845
3.1 Additional equipment
Solenoid valve
If the voltage supply for the solenoid valve
(12) fails, the supply pressure for the i/p
converter is vented to the atmosphere. The
positioner can no longer operate and the
control valve moves to the fail-safe position
determined by the actuator, regardless of the
set point.
The manual set point is also reset to 0 % af -
ter the solenoid valve is activated!
A different manual set point must be entered
again (Code 1).
Inductive limit switch
In this version, the rotary shaft of the posi-
tioner carries an adjustable tag which actu-
ates the built-in proximity switch.
External position sensor
In this version, only the sensor is mounted to
the control valve. The positioner is located
separately from the valve. The connection of
x and y signals to the valve is established by
cable and piping for air (only without induc-
tive limit switch).
Binary input BI1
As a standard feature, the positioner comes
with a binary input for DC voltage signals to
signalize process information over the
PROFIBUS-PA network.
Binary input BI2
This binary input BI2 is optional. It is an ac-
tive input which is powered by the positioner
to connect a floating contact. The switching
state of the floating contact can be indicated
over the PROFIBUS-PA network.
NOTICE !