30
7 ND90 71 en
After the calibration sequence is finished, press the
=
key
twice to get back to the measurement view.
Please refer to Chapter 7 if this sequence has failed and an
error message is displayed.
The valve can now be unlocked.
5.6.4 Linearization
Linearization
FLI
can be used for linear valves when linkage
geometry is needed to be corrected by valve controller.
Linearization can be done with 3 points (and end points) or
with 9 points (and end points).
3-point linearization will be done in positions 25 %, 50 %
and 75 %.
9-point linearization will be done in positions 10 %, 20 %,
30 %, 40 %, 50 %, 60 %, 70 %, 80 % and 90 %.
Before linearization:
Perform the Valve travel calibration (auto or manual).
Before 3-point or 9-point linearization is visible on
the display. Valve type
VTYP
has to be set as Fixed
Linear
FLI
.
Linearization:
Select 3-point
LCAL 3P
or 9-point
LCAL 9P
lineari-
zation from
CAL
by pressing the
?
key.
The display shows
SET 10 %
or
SET 25 %
depend-
ing on which is selected: 3-point or 9-point calibra-
tion.
Drive valve position manually with the
+
and
-
keys to
10 %
or
25 %
.
When required position is reached (according to
position measured by external measurement) press
the
?
key.
The display starts to blink next position (
50 %
or
20 %
). When last point have confirmed, the LUI dis-
plays that calibration is successful and returns to
basic measurement display.
User can terminate linearization any time by press-
ing the
=
key. Linearization is cancelled and device
returns to basic measurement display. No changes to
linearization are made and corresponding message
is shown to user.
If linearization fails, a message about the reason will be
shown on the LUI display and also in event log that can be
read with DTM. If linearization is not successfully com-
pleted, there will be no changes in linearization.
5.6.5 LS status
ND9000F and ND9000P only
LS shows the status of limit switches:
---
No LS active
CLO
LS "Closed" active
OPE
LS "Open" active
LSE
LS Error, both switches activated
at the same time
5.7
Special displays
5.7.1 User interface locked
In order to prevent unauthorised access, the Local User
Interface may be locked. In this mode measurements may
be viewed but configurations and calibrations are prohib-
ited. You may lock and unlock the device only via HART
(ND9000H, ND7000H) or dip switch (ND9000F, ND9000P),
see Fig. 32 and 33. When the Local User Interface is locked
the lock symbol will be activated on the display.
5.7.2 Online-alarm active
If an online alarm has been detected the solid
&
symbol is
activated. This symbol will disappear after the recovery
from online alarm. You may view the reason for the alarm
by viewing the latest event while pushing the
=
and
-
keys simultaneously or by using FieldCare software where
all events may be viewed.
WARNING:
Supply pressure can be connected to the valve con-
troller only after 1-point calibration is successfully
completed. If supply pressure is connected to the
valve controller before successful 1-point calibration,
the valve may move and cause danger.
NOTE:
If an incorrect valve operation angle is given to the valve
controller during 1-point calibration, valve operation will
be incorrect. In this case, you must perform 1-point cali-
bration again with correct valve operation angle value.
NOTE:
If the valve position is not stable (due to heavy vibration
etc) during 1-point calibration, the calibration will not end
successfully. Check that the valve position is fully stable
during this operation.
NOTE:
There have to be external position measurement in linear
valve that you can compare actual position and given
position.
Fig. 28
LUI locked
Fig. 29
Example of online alarm message
scrolling text