Samson 3730-5 - Additional Equipment; Communication

The positioner communicates and is pow
-
ered using IEC 61158-2 transmission tech
-
nology conforming to F
OUNDATION™
fieldbus specification.
As a standard feature, the positioner comes
with a binary input for DC voltage signals to
signalize process information over the
F
OUNDATION
™
fieldbus.
3.1 Additional equipment
Version with solenoid valve
If the operating voltage for the solenoid
valve (12) fails, the supply pressure for the
i/p module 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, independent of
the reference variable.
NOTICE
In manual mode (MAN), the manual set
point is also reset to 0 %. A different manual
set point must be entered again (Code 1).
Version with inductive limit switch
The rotary shaft of the positioner carries an
adjustable tag which actuates the installed
proximity switch.
Version with binary contact
All positioners are fitted with a binary input
for DC voltage signals over which process
information can be issued over the
F
OUNDATION™ fieldbus network.
Another optional binary input is an active
input powered by the positioner to connect
a floating contact. Its switching condition
can also be issued over the F
OUNDATION™
fieldbus network.
Version with 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 inductive limit switch).
EXPERT
+
extended valve diagnostics
See Table 5 on page 42 for order numbers.
EXPERT
+
upgrades the standard EXPERT di-
agnostics firmware incorporated in the
positioner. The upgraded version provides
extended functions to pinpoint valve param-
eters that have worsened, allowing the user
to plan predictive maintenance and service
work before malfunctions can affect the pro-
cess and may cause unscheduled plant shut-
downs.
The extended EXPERT
+
diagnostics can be
activated later at the positioner when
EXPERT
+
is not already activated on delivery
of the positioner. The required activation
code or an EXPERT
+
USB dongle can be
purchased to activate EXPERT
+
.
3.2 Communication
The positioner is completely controlled over
the digital signal transmission implemented
according to F
OUNDATION™ fieldbus spec
-
ification.
Data are transmitted as bit-synchronous
current modulation at a rate of 31.25 kbit/s
Design and principle of operation
EB 8384-5 EN 13