Samson 3730-4 - 7 Start-Up and Settings; Enter Fail-Safe Action

62 EB 8384-4 EN
Start-up and settings
7 Start-up and settings
Risk of malfunction due to incorrect sequence
of mounting, installation, and start-up.
Keep the following sequence.
1. Remove the protective lm from the
pneumatic connections.
2. Mount the positioner on the control valve.
3.
Connect the supply air.
4. Connect the electrical power.
5. Perform the start-up settings.
The start-up can also be performed without
the connected bus network, provided a DC
voltage source (9 to 32V) is connected at
the bus connection terminals. Make sure a
sufcientlyprotectedsourceisusedforin-
trinsicallysafepositioners.
Reading after connecting the electrical pow-
er supply:
tEStinG runs across the display and the
fault alarm icon appears and blinks on the
display when the positioner has not been
initialized. The reading indicates the lever
position in degrees in relation to the mid-ax-
is.
Reading when the positioner
has not yet been initialized
Code 0 is displayed when a positioner has
been initialized. The positioner is in the last
active operating mode.
Risk of injury due to the actuator stem ex-
tending or retracting.
Do not touch or block the actuator stem.
The positioner performs a test in the start-up
phase while following its automation task at
the same time.
During the start-up phase, operation on site
is unrestricted, yet write access is limited.
Perform the start-up settings in the same se-
quence as described (section 7.1 to sec-
tion7.6).
7.1 Enter fail-safe action
Dene the closed position of the valve (0%)
taking the valve type and the actuator's di-
rection of action into account. Position the
AIR TO OPEN/AIR TO CLOSE slide switch
accordingly:
− AIR TO OPEN setting
Signal pressure opens the valve, e.g. for
a fail-close valve
The AIR TO OPEN (AtO) setting always ap-
plies to double-acting actuators.
− AIR TO CLOSE setting
Signal pressure closes the valve, e.g. for
a fail-open valve
NOTICE
!
Note
WARNING
!
Note