20 7 ND91H 70 en
6.2.2 Installation
❑ Ensure that the gasket (174) is properly located
in the groove on the bottom of the spool valve
assembly. Mount the spool valve assembly on to
the housing and tighten the M3 and M4 screws
evenly. Ensure the O-ring (140) slots inside the
groove fully. Mount the prestage unit directly on
the spool valve unit as in 6.1.
6.3 Communication circuit board
6.3.1 Removal
❑ Loosen the M8 grub screw (110) off the position
indicator (109) and turn the position indicator
from the shaft. Remove the cover off the prestage
(43). Remove the cover of the circuit boards
attached with M3 screws (42, 4 pcs).
❑ Remove the M3 screws (217, 4 pcs.). Hold the
sides of the circuit board and lift it directly
upwards and outwards. Handle the board care-
fully, touching only the sides.
6.3.2 Installation
❑ Mount the new communication circuit board
carefully.
❑ Locate the pins with the matching connector on
the board. Tighten the M3 screws (217) evenly.
❑ Install the cover of the circuit boards and the
cover of the prestage (43).
❑ Mount the position indicator (109) on the shaft
and tighten the M8 screw (110) temporarily. The
final orientation and locking of the position indi-
cator should be done after installation of the
valve controller to the actuator.
7 ERROR MESSAGES
7.1 Failsafe errors
7.2 Alarms
Fig. 22 Spool valve assembly
NOTE:
If the maintenance operations have been done for the
spool valve assembly, the device must always be cal-
ibrated and tuned.
NOTE:
Ground yourself on the body of the device before
touching the circuit board.
NOTE:
Do not remove the Valve Controller Board (210)!
Removing the board will void the warranty.
195 194140 160 174 175
0327000170
Assembly direction of spool
Sticker on fastener (160)
Fig. 23 Communication board
Display message Description
POSITION SENSOR FAILURE Position sensor measurement
failed. Change the ND9000
device to a new one.
SETPOINT SENSOR
FAILU RE
mA measurement failed.
Change the ND9000 device
to a new one.
PRESTAGE SHORTCUT
ERROR
Shortcut in the prestage unit.
FAE nnn Fatal malfunction in the device.
nnn is a number between 001 -
004. Change the ND9000
device to a new one.
Display message Description
DEVIATION ALARM Valve deviation out of limits.
STICTION LOW ALARM Stiction has exceeded the
low limit.
STICTION HIGH ALARM Stiction has exceeded the
high limit.
LOAD FOR OPENING LOW
ALARM
Load for opening has
exceeded the low limit.
LOAD FOR OPENING HIGH
ALARM
Load for opening has
exceeded the high limit.
SPOOL VALVE PROBLEM Spool valve problem in the
controller. Check the spool
valve unit and replace if
necessary.
PNEUMATICS PROBLEM Inconsistent actuator
pressures. Check pneumatic
connections and actuator
leakage.
FRICTION PROBLEM Valve is not moving correctly.
Check load factor.
215
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