Samson 3730-4, Mounting And Operating Instructions

Page: 58 / 212

4.3.2 SAFE – Fail-safe position
If you want to move the valve to fail-safe po-
sition, proceed as follows:
Select Code 0 , press the button, AUtO or
MAN appears on the display, Code 0
blinks.
Turn the button until SAFE appears.
Press the button to confirm this setting.
CAUTION!
The valve moves to the fail-safe position. The
S symbol for the fail-safe position appears
on the display.
Once the positioner is initialized, the current
valve position is indicated on the digital dis-
play in %.
If you want to return the valve from the
fail-safe position to the operating mode
AUtO or MAN , the button must be
pressed while Code 0 is active.
When the code number blinks, turn the
button to switch to the desired operating
mode.
Press the
button to confirm.
Note: The valve can be moved to the
fail-safe position over the fieldbus by the
SET_FAIL_SAFE_POS parameter (see page
178).
5 Start-up and settings
Note:
A summary about start-up and opera-
tion can be found in section 8 on page 79.
4
Connect pneumatic supply air
(Supply 9), making sure the pressure is
correct as described in section 3.1.
4 Apply the electric reference variable as
described in section 3.2.
4
The voltage supply >19 V DC for version
with a solenoid valve must be connected
at terminals 81 (+) und 82 (–).
WARNING!
Supply pressure may cause the ac-
tuator stem to move.
Risk of injury!
Note:
The positioner performs a test in the
start-up phase while following its automa-
tion task at the same time. During the
start-up phase, operation on site is unre-
stricted, yet write access is limited.
A valid set point from the process control
system still does not exist if a blinking
S ap-
pears on the display (see page 94).
58
EB 8384-4 EN
Start-up and settings