EB 8384-6S EN
109
EB 8384-6S
109
Operating the positioner
4. Press
to confirm the MAN2 as the ini
-
tialization mode.
POS1
and the current an-
gle position of the lever are indicated on
the display in alternating sequence.
5. Turn clockwise in small steps until the
required valve position is reached. The
valve must be moved with a monotonically
increasing signal pressure.
6. Press
to confirm the valve position
(reading:
WAIT
). The valve position is ad-
opted after the pressure settles.
POS2
and
the current angle position of the lever are
indicated on the display in alternating se-
quence.
7. Turn until the valve reaches its OPEN
position.
8. Press
to confirm the valve position
(reading:
WAIT
). Initialization can be start-
ed as soon as
MAN2
is indicated again on
the display.
POS1 (end position 1)
POS2 (end position 2)
Start initialization:
Î
Press INIT key.
After initialization, the tight-closing function (Code 14) is deactivated.
7.6.5
SUB – Substitute calibration
A complete initialization procedure takes several minutes and requires the valve to move
through its entire travel range several times. In the SUB initialization mode, the control pa-
rameters are estimated and not determined by an initialization procedure. As a result, a high
level of accuracy cannot be expected. A different initialization mode should be selected if the
plant allows it.
The substitute calibration is used to replace a positioner while the process is running. For this
purpose, the control valve is usually fixed mechanically in a certain position or pneumatically
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