Samson 4785, Mounting And Operating Instructions

Page: 35 / 78

Set delay time to at least 30 sec.
Enter tag identification.
If necessary, additional 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 the positioner, which is not
mounted on a valve, to a power supply
and initialize the positioner as described
in section 4.4.2.
If communication is not possible, the de-
fault settings must be used.
Mount positioner and adjust mechanical
zero as described in section 4.4.1.
Start initialization by pressing the
Init/Zero key on the case cover of the
positioner 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 only starts a zero calibration.
After this, a new initialization routine can
only be started when the communication is
connected.
A completed initialization can be canceled
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, mechanical
zero has shifted, an electric zero calibration
can be carried out. To do this, press the
Init/Zero key located on the inside of the
cover (Fig. 11).
Caution!
The control valve moves to its final
position.
Firmly push the zero point lever, which is
located in the cover plate of the posi-
tioner, once in the direction indicated by
the arrow as far as it will go. The yellow
pointer will then be on the white mark-
ing line.
Press the key again to start electric cali-
bration.
After the key has been pressed for the sec-
ond time, it is locked for approximately one
minute!
Electric calibration is completed when the
positioner takes on the position predeter-
mined by the reference variable.
EB 8382-2 EN
35
Operation