15
❑
After the desired value is displayed, press the
key
?
to conclude the operation
4.5.7 Valve rotation direction,
ROT
The application-specific parameter
ROT
defines the rela-
tionship between position sensor rotation and valve
action.
❑
Once
ROT
is displayed press the
?
key to enter
the edit state and
ROT
starts to blink.
❑
Now you may select between two values by
pressing the
+
or
-
key. The value
cC
indicates
clockwise rotation for closing the valve and
ccC
means counterclockwise to close.
❑
After the desired value is displayed, press the
key
?
to conclude the operation.
4.5.8 Valve dead angle,
A0
The
α
0
setting is made for Metso Automation segment
and ball valves. This setting takes into account the "dead
angle"
α
0
of the ball valves. The entire signal range is then
used for effective valve opening 90° -
α
0
. Use 0 % as the
"dead angle" for the valves not mentioned in Table 5.
❑
After selecting
A0
on the display, press the
?
key to enter the edit state and
A0
starts to blink.
The value currently selected appears as a per-
centage (
%
) on the display.
❑
Modify the parameter value by pressing
+
or
-
keys alternately until the desired value appears
on the display.
❑
Press the
?
key to make your selection and
return to the setting state.
4.5.9 Low cut-off, low limit, high cut-off,
high limit
ND9000 supports signal cut-off and limiting in both ends
of the operating range. The configuration parameters
are; low cut-off, low limit, high cut-off and high limit.
❑
If the input signal is smaller than low cut-off, the
valve will be fully closed.
❑
If the input signal is smaller than low limit, the
valve stays in the low limit.
❑
If the input signal is greater than high cut-off, the
valve will be fully opened.
❑
If the input signal is greater than high limit, the
valve stays in the high limit.
The cut-off overrides the limit as follows:
❑
If the low cut-off > low limit, the low limit is not
active.
❑
If the low cut-off < low limit, both low cut-off and
limit are active.
❑
If the low cut-off is set to zero, the low cut-off is
not active.
❑
If the high cut-off < high limit, the high limit is not
active.
❑
If the high cut-off > high limit, both high cut-off
and limit are active.
❑
If the high cut-off is set to 100 %, the high cut-off
is not active.
Only the low cut-off is adjustable using the LUI. Low limit, high
cut-off and high limit are configurable via FieldCare software.
NOTE:
Perform valve calibration and tuning always when con-
troller fail action parameter has been changed.
Table 5
Dead angle in percentage
Valve
size
Valve series
MBV
QMBV
1)
MBV
QMBV
2)
D
3)
T5,
QT5
QX-
T5
T25,
QT25
QX-
T25
R,
QR
E
mm
in
Dead angle, %
25
1
14
-
-
25.5 19.5
-
-
15
25.5
40
1 1/2
12
-
-
24.5 12.5
-
-
12
16.0
50
2
10
9
13.5
24.5
12.5 18.0
8.0
17
20.5
65
2 1/2
9
-
-
-
-
-
-
13
-
80
3
10
8
12.0 18.0
8.0
16.5
8.5
9
8.5
100
4
10
8
12.0 16.5
8.5
16.0
9.0
8
7.0
125
5
12
-
-
-
-
12.0
6.5
8
-
150
6
10
8
11.5 16.0
9.0
13.5
8
13.5
200
8
9
7
8.5
12.0
6.5
9.5
7
250
10
9
7
7.5
13.5
9.5
7
300
12
8
6
6.5
9.5
7.5
6
350
14
6
6.0
-
5
400
16
5
5.5
9.5
(14")
5
450
18
6.0
7.5
(16")
500
20
6.0
600
24
5.5
650
26
7.0
700
28
7.0
750
30
6.0
800
32
-
900
36
5.5
1) Seat supported 2) Trunnion 3) S/G seat
Fig. 14
Principle of setting
Fig. 15
Dead angle
100
80
60
40
20
0
0
20
40
60
80
100
α
0
α
0
POSITION
INPUT SIGNAL
= Basic setting
=
α
0 setting
Increasing input signal closes valve
Increasing input signal opens valve
cut-off safety range 2
±
0.5 %
α
0
Содержание ND9200H
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