Start-Up And Settings; Defining The Fail-Safe Position - Samson 3730-5 Mounting And Operating Instructions

Start-up and settings

7 Start-up and settings
NOTICE
Risk of malfunction due to incorrect
sequence of mounting, installation
and start-up.
Keep the following sequence.
1. Remove the protective film 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.
Reading after connecting the electrical pow-
er supply:
tEStinG runs across the display and then 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.
Code 0 appears on the display when a posi-
tioner has been initialized. The positioner is
in the last active operating mode.
WARNING!
Risk of injury due to the actuator
stem extending or retracting.
62
Reading when the positioner
has not yet been initialized
Do not touch or block the actuator
stem.
Note:

The positioner performs a test in the
start-up phase while following its au-
tomation task at the same time.
During the start-up phase, operation
on site is unrestricted, yet write ac-
cess is limited.
Perform the start-up settings in the same se-
quence as described (section 7.1 to sec-
tion 7.6).
7.1 Defining the fail-safe posi-
tion
Define the fail-safe position (0 %) taking the
valve type and the actuator's direction of ac-
tion into account. Position the AIR TO
OPEN/AIR TO CLOSE slide switch accord-
ingly:
− 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
For checking purposes: After successfully
completing initialization, the positioner dis-
play must read 0 % when the valve is in the
fail-safe position and 100 % when the valve
is open. If this is not the case, change the
EB 8384-5 EN