Samson TROVIS SAFE 3731-3, Монтаж и эксплуатация

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3.2 Additional equipment
Forced venting
The i/p converter stops working if the oper-
ating voltage supply to the relevant terminals
is interrupted. The positioner can no longer
operate and the control valve moves to the
fail-safe position (SAFE) determined by the
actuator, independent of the reference vari-
able.
Binary contact
The positioner has three internal binary sig-
nals which can be analyzed over terminals
A/B/C. Two of these signals are intended
for the valve end positions and one signal
for a collective fault alarm. The assignment
of these signals to the A/B/C terminals is
determined over Code
25 .
Position transmitter
The position transmitter (13) is a two-wire
transmitter and issues the travel sensor sig-
nal as a 4 to 20 mA signal processed by the
microcontroller. Since this signal is issued in-
dependent of the positioner’s input signal
(min. current 3.8 mA), the actual travel/an-
gle of rotation is controlled in real-time. Ad-
ditionally, the position transmitter provides
the possibility of signaling a positioner fault
over a signal current of 2.4 mA or
21.6 mA.
Binary input
The positioner has an optional binary input.
The following actions can be performed over
the binary input:
4
Transfer switching state [default]
The switching state of the binary input is
logged.
4
Set local operation write protection
Settings cannot be changed at the
positioner while the binary input is ac-
tive. The configuration enabled function
in Code
3
is not active.
4
Start partial stroke test (PST)
The positioner starts a single partial
stroke test. The test is performed accord-
ing to the settings in Code
49 - d2
to
Code 49 - d9 (refer to EB 8389S EN on
EXPERTplus valve diagnostics).
4
Go to fail-safe reference value
An open/close valve moves to the en-
tered fail-safe reference value when the
positioner is in automatic mode
(AUTO).
No action is started when the positioner
is in manual mode
(MAN) or fail-safe
position (SAFE).
4
Switch between AUTO/MAN
The positioner changes from automatic
mode
(AUTO) mode into manual
mode (MAN) and vice versa.
No action is started if the positioner is in
the fail-safe position (SAFE).
4
Start data logger
The data logger is started when the bi-
nary input is active (refer to
EB 8389S on EXPERTplus valve diagnos-
tics).
4
Reset diagnosis
Any active diagnostic functions in Statis-
tical information (in-service monitoring)
10
EB 8387-3S EN
Design and principle of operation