74
NDX VALVE CONTROLLER
WARNING
The prestage must be handled carefully. Never
touch the moving parts on the prestage and
never rotate the nozzle. If the moving parts of
the prestage are damaged, that may lead to
reduced control performance of the device.
NOTE
It is recommended to replace both the pre
stage and the relay valve at the same time.
NOTE
It is recommended to also replace the filter and
seal below the prestage (included in the spare
parts kit). (Fig. 76)
© Metso 2015
- NDX valve controller
- Relay valve
- Prestage unit
- Local User Interface
- Printed circuit board module (including optional PT)
- Pressure gauge block
REPLACING NDX ON NELES GLOBE
Follow instructions in mounting chapter.
REPLACING SPARE PARTS
Prestage
Prestage is located under cover with following symbol:
Removal
WARNING: Risk of injury. Ensure that supply pressure is shut off and actuator pressure is released prior
to removal of the prestage.
WARNING: The prestage must be handled carefully. Never touch the moving parts on the prestage and
never rotate the nozzle. If the moving parts of the prestage are damaged, that may lead to reduced
control performance of the device.
NOTE: It is recommended to replace both the prestage and the relay valve at the same time.
NOTE: it is recommended to also replace the filter and seal below the prestage (included in the spare
parts kit)
- Disconnect power from the device
- Shut off
supply pressure and make sure that the actuator pressure is released
- Remove the device from the actuator mounting bracket if there is limited working space in front of the
prestage cover (Disconnect the supply and actuator piping if device is needed to remove).
- Loosen the prestage cover M4 screws (Torx T20, 4 pcs) and remove the prestage cover
Fig. 76
Compact version (NDX1510_):
•
TX20, Pliers
•
Disconnect power from the device.
•
Shut off supply pressure and make sure that the
actuator pressure is released.
•
Remove the device from the actuator mounting
bracket if there is limited working space in front
of the prestage cover (Disconnect the supply and
actuator piping if device is needed to remove).
•
Loosen the prestage cover screws and remove
the prestage cover. (Fig. 78)
•
Unplug the prestage wire connector from the
prestage (Fig. 78)
•
Loosen the screws holding the prestage in place.
(Fig. 78)
•
Pull out the prestage carefully. It is recommended
to use pliers to grab the grooves on the sides of
the prestage. Be careful not to touch the moving
parts of the prestage. (Fig. 80)
Standard and explosion proof version (NDX_511_ and NDX_512_):
•
PH2 (NDX_511_) or HEX6 (NDX_512_), TX7, TX8,
TX20, Pliers
•
Disconnect power from the device.
•
Shut off supply pressure and make sure that the
actuator pressure is released.
•
Remove the main cover by loosening 4 screws.
•
Loosen the display screws and remove display.
•
Unplug the prestage wire connector from the
prestage (Fig. 79)
•
Loosen the screws holding the prestage in place.
(Fig. 79)
•
Pull out the prestage carefully. It is recommended
to use pliers to grab the grooves on the sides of the
prestage. Be careful not to touch the moving parts
of the prestage. (Fig. 81)
14.3.3
Installation of prestage
NOTE
Make sure there is no debris in the prestage
shaft hole, eg. from the old oring. (Fig. 77)
Fig. 77
NOTE
Check that the new oring is covered with
lube to avoid damage. Use only oring lubes,
which is delivered with the spare part set.
Fig. 78
Fig. 79
14 MAINTENANCE
