Samson 373 Series Operating Instructions

EB 8389 EN 15
Operation
for 'Drive signal diagram steady-state' or
'Drive signal diagram hysteresis'.
Diagnostics
− Start reference test (Code 48 - d7)
or
Start-up
− Initialization with reference test (Code 48 - h0):
Yes, [No]
2.5 Diagnostic functions
There are two main groups of diagnostic
functions available: Statistical information
(in-service monitoring) and Tests (out-of-ser-
vice diagnostics).
1. Statistical information
Data are compiled, saved and analyzed
by the positioner while the process is
running without disrupting the process.
The data are saved and analyzed in the
positioner, i.e. the positioner follows the
set point to position the valve. A classi-
ed status message or error message is
generated if the positioner detects an
event.
2. Tests
Similar to the statistical information, data
are compiled, saved and analyzed by
the positioner. However, in this case, the
valve position is not determined by the
set point, but by the active test.
The tests can only be started when the condi-
tions in the plant allow it (e.g. plant shut-
down or service work in the workshop). For
NOTICE
!
reasons of safety, these tests, except for par-
tial stroke testing, can only be performed in
the manual mode.
An active test is stopped and the posi-
tioner changes to the fail-safe position
when the electrical signal falls below a
certain level or when the solenoid valve
is triggered or the forced venting func-
tion is activated.
2.5.1 Application type
Different diagnostic functions are available
depending on the application type selected
in EXPERTplus.
The application types 'Control valve' and
'Open/Close valve' are available for
Types3730-2/-3/-5 and Types3731-3/-5
Positioners.
The application type cannot be selected for
Type3730-4. This positioner can only be
used for throttling applications, i.e. 'Control
valve' application type.
Depending on the application type selected,
the positioner behaves differently in the au-
tomatic mode:
− Control valve
The positioner uses the set point to posi-
tion the valve.
The valve position (current position) ap-
pears in % on the display.
− Open/close (on/off) valve
Discrete analysis of the set point
The valve position (current position) in %
and O/C (Open/Close) appear in alter-

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English