26
7 ND90 71 en
5.5
Configuration parameters
When
PAR
is on the display you may enter the configura-
tion menu by pressing the
?
key. In this menu the most
important configuration and signal modification parame-
ters are viewable. You may view the current value and edit
them by pressing the
?
key at the relevant parameter. The
name of the parameter will appear on the upper row of the
display and the current value is on the lower row.
5.5.1 Performance level,
PERF
If you want to change the tuning of the valve position con-
trol, the
PERF
selection is available. The default factory
value is
C
.
Once
PERF
is displayed press the
?
key to enter the
edit state and
PERF
starts to blink.
Select between five values by pressing the
+
or
-
key.
After the desired value is displayed, press the
?
key
to conclude the operation.
5.5.2 Low cut-off,
CUTL
Low cut-off safety range
CUTL
ensures the valve closing
against mechanical travel stops. The factory default value is
2 %.
Once
CUTL
is displayed press the
?
key to enter the
edit state and the
CUTL
will start to blink. The cur-
rently selected value appears as a percentage (
%
) on
the display
Modify the parameter value by pressing
+
or
-
keys alternately until the desired value appears on
the display.
After the desired value is displayed, press the
?
key
to conclude the operation.
5.5.3 Signal direction,
DIR
ND9000H, ND7000H
The opening and closing direction of the valve with raising
current loop signal is defined by signal direction parameter
DIR
.
When
DIR
is displayed press the
?
key to enter the
edit state and
DIR
starts to blink.
Select either the
OPE
or
CLO
values by pressing the
+
and
-
keys. The value
OPE
signifies the raising
signal 4–20 mA to open the valve and
CLO
means
the raising signal to close the valve.
To conclude, press the
?
key when the desired
value is shown on the display.
See default values in Fig. 7 and 8.
Fig. 22
Configuration, ND9000P
Fig. 23
Setpoint change in MAN mode
— brief push
Table 7
Performance level
Selection
Meaning
Description
A
Aggressive
Immediate response to signal
changes, overshoots
b
Fast
Fast response to signal changes,
small overshooting
C
Optimum
Very small overshoot with
minimum step response time
d
Stable
No overshooting, slow response
to input signal changes
E
Maximum stability
No overshooting, deadband may
increase, slow but stable
behaviour
For use with volume boosters and/or very fast actuators, additional
performance levels A1 to D1 can be used.
Characteristics of these extended levels are the same as those in the
table above. However, with performance level settings A1 to D1,
adaptive properties of the ND control algorithm are disabled.