Samson 373 Series Operating Instructions

EB 8389 EN 73
Start conditions PST with application type = 'Open/Close valve'
Operating mode
â â â
SAFE AUTO MAN
w < 'Limit
fail-safe
position'
25%
< w >
50%
w > 'Limit
fail-safe
position'
â
PST mode PST mode
â â â â â â
PST
Man
PST
Auto
PST
Auto
PST
Man
PST
Man
PST
Auto
∆t > 6 s
25
50
x [%]
w [%]
t [s]
â â
PST not
possible
PST not
possible
â â â â â
PST not
possible
PST possible
1, 3, 4) 1, 2, 3, 4) 1, 2, 3) 1, 3)
â â â â â â â
Fail-safe action of actuator
(fail-safe position operating
mode)
Operating point/valve position according to set point
1)
PST starts once
2)
PST starts once by setting 'Auto test time'
3)
PST starts over binary input
4)
PST starts once over set point w (see section4.1)
Tests – Partial stroke test (PST)

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English