Metso neles ND7000H Operating Instructions Manual page 27

7 ND90 71 en
5.5.4 Valve type, VTYP
To compensate for nonlinearity of the position feedback
caused by the actuator linkage mechanism of a linear con-
trol valve, the appropriate selection must be made on the
VTYP display.

After selecting VTYP on the display, press the ? key
to enter the edit state and the VTYP starts to blink.

Select between four values rot, LIn, nCG or FLI
using the + and - keys. The value rot indicates a
rotary valve and LIn a linear valve. Use nCG only for
nelesCV Globe valves to accommodate special link-
age geometry. Use FLI only for linear valves when
linkage geometry is needed to be corrected by valve
controller.

To conclude press the ? key when the desired
value is shown on the display.
NOTE:
Perform valve calibration always when VTYP has been
changed.
5.5.5 Actuator type, ATYP
In order to optimise the control performance the device
needs to be informed about the actuator type.

After selecting ATYP on the display, press the ? key
to enter the edit state and ATYP starts to blink.

Select between two values 2-A or 1-A using the +
and - keys. The value 2-A indicates a double acting
actuator and 1-A a single acting actuator.

To conclude press the ? key when the desired
value is shown on the display.
NOTE:
Perform valve calibration always when ATYP has been
changed.
5.5.6 Positioner fail action, PFA
Positioner fail action will take place in case of signal failure
or when the controller software discovers a fatal device fail-
ure. For single acting actuators set value in the spring direc-
tion. For double acting actuators see Fig. 7 and 8 for correct
settings.

Once PFA is displayed, press the ? key to enter the
edit state and the PFA will start blinking.

You may select between two values by pressing the
+ or - key. The CLO value indicates that the valve
ought to be closed in fail action situations. The OPE
value indicates the valve to be opened in fail action
situations.

After the desired value is displayed, press the ? key
to conclude the operation.
NOTE:
Perform valve calibration always when controller fail
action parameter has been changed.
5.5.7 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 coun-
terclockwise to close.

After the desired value is displayed, press the ? key
to conclude the operation.
NOTE:
Perform valve calibration always when ROT has been
changed.
5.5.8 Valve dead angle, A0
The α
setting is made for Metso segment and ball valves.
0
This setting takes into account the "dead angle" α
ball valves. The entire signal range is then used for effective
valve opening 90° - α
. Use 0 % as the "dead angle" for the
0
valves not mentioned in Table 7.
Increasing input signal closes valve
POSITION
100
80
60
40
20
0
0 20
cut-off safety range 2 ± 0.5 %
= Basic setting
Fig. 24 Principle of setting, ND9000H and ND7000H
Position
100
80
60
40
20
α 0
0
0 20
low cut-off safety range 2 ± 0.5 %
Basic setting
Fig. 25 Principle of setting, ND9000F and ND9000P
Fig. 26 Dead angle
0
Increasing input signal opens valve
40 60 80 100
INPUT SIGNAL
setting
Input signal
40 60 80 100
α
setting
0
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of the