Samson 3780 series, Mounting And Operating Instructions

Page: 36 / 76

Fail-safe position "Actuator stem ex-
tends" (FA):
Direction of action: increasing/increas-
ing (>>), the globe valve opens with in-
creasing reference variable
Final position at a reference variable
less than 1% (tight closing),
Final position at a reference variable
larger than 125 % (function deacti-
vated).
Fail-safe position "Actuator stem re-
tracts" (FE):
Direction of action: increasing/decreas-
ing (<>), the globe valve closes with in-
creasing reference variable
Final position at a reference variable
less than
−
2.5% (function deactivated),
Final position at a reference variable
larger than 99 % (tight closing).
Set delay time to 30 s at the minimum.
Enter tag identification.
If necessary, other configuration, e.g.
special characteristics for rotary valves.
If there is no communication set up on the
valve, initialization directly at the valve is
also possible.
Connect positioners that are not
mounted on a valve to a power supply
and initialize the positioner as de-
scribed in section 4.3.2.
If communication is not possible, the de-
fault setting must be used.
Mount positioner and set the mechan-
ical zero point as described in section
4.3.1.
Start initialization by pressing the
Init/Zero key on the positioner hinged
cover using a suitable tool.
The initialization is completed when the po-
sitioner takes on the position predetermined
by the reference variable.
Note!
After the positioner has been initialized suc-
cessfully for the first time, pressing the
Init/Zero key subsequently only starts a
zero calibration.
A new initialization routine can only be
started after this when communication is
connected.
A completed initialization can be cancelled
via the communication with the command
"Reset to default values". After this, the
Init/Zero key can be pressed to start a com-
plete initialization.
Electric zero calibration
If, during the valve’s operation, the mechan-
ical zero has shifted, an electric zero cali-
bration can be carried out. To do this, press
the Init/Zero key located on the inside of
the cover (Fig. 12).
Caution!
The control valve moves to its final
position.
Firmly press the zero lever, located on
the cover plate of the positioner, in the
direction indicated by the arrow as far
as it will go once. The yellow pointer
will then be aligned with the white line.
Press the key again to start the electric
calibration.
After the key is pressed twice, it is locked
for approximately one minute!
36
EB 8380-1 EN
Operation
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