Samson 3730 Series Operating Instructions

38 EB 8389-1S EN
On/off valve
The PST diagnostic parameter 'Lower range
value' must be within the dened position ±
'Tolerance limit' for the partial stroke test to
start.
After the partial stroke test is completed, the
valve moves back to its last position (fail-safe
position or operating point).
Canceling the partial stroke test (PST)
The partial stroke test is canceled whenever
the set point (
) leaves the range between
'Fail-safe action limit' and 'Operating point
limit', falling below 'Operating point limit'.
After the partial stroke test is canceled, the
valve moves back to its last position (fail-safe
position or operating point).
Dening parameters
Note:
The parameters can only be dened in
TROVIS-VIEW4 after the 'Type of ap-
plication' has been set to 'On/off
valve'.
1. Select the type of application.
2. Dene parameters for on/off valve.
3. Dene parameters for partial stroke test
(PST). See u Section 12.
1.
Start-up
− Type of application (Code 49 - h0): On/off
valve
2.
Device settings > Positioner > Transfer
characteristic on/off
− Operating point (Code 49 - h1): 0.0 to
100%, [100 %]
− Fail-safe action limit (Code 49 - h2): 0.0 to
20.0 %, [12.5 %]
− Operating point limit (Code 49 - h5):
55.0 to 100.0 %, [75.0 %]
3.
Diagnostics > Monitoring/tests > Dynamic
tests > Partial stroke test (PST)
See u Section 12
5.1 Diagnostics for on/off
valve
The diagnostics for on/off valve provide
statements on the valve end positions, transit
times (increasing/decreasing) and break-
away times (increasing/decreasing).
The data are recorded automatically for the
diagnostics for on/off valve in automatic
mode. Data logging does not need to be ac-
tivated.
The positioner compares the current break-
away time, transit time and valve position
with the values recorded during the reference
measurement (rst analysis) while the plant is
running.
Dening parameters
Note:
The parameters can only be dened in
TROVIS-VIEW4 after the 'Type of ap-
plication' has been set to 'On/off
valve'.
1. Enter limits for monitoring. See u
Section
5.2.
2. Select classication for status messages.

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Samson 3730 Series Specifications

General

Brand	Samson
Model	3730 Series
Category	Valve Positioners
Language	English