7 ND90 71 en
41
9.3
Electrical connections
Before connecting the power, make sure that the electrical
specifications and the wiring meet the installation condi-
tions. See the diagrams in 12.11. Refer to the information on
the identification plate.
ND9000/D__ and ND9000/I__:
Observe the functioning of
the proximity switch; activated when the active face is
either covered or free.
9.4
Adjustment
The pointer (109) need not be removed for adjustment.
When the limit switch is ordered together with the valve
and the actuator, the valve controller switches are factory-
adjusted. The limits may be adjusted by altering the posi-
tion of the cam discs (313) on the shaft.
The lower switch is activated at the closed limit and the
upper switch at the open limit.
With the actuator in the open or closed position,
locate the switching point by turning the cam disc so
that the switch state changes approx. 5°–6° before
the limit.
ND9000/D__ and ND9000/I__:
Use the LED indica-
tor or a separate measuring instrument as an aid.
After re-installation of the actuator, first adjust its
mechanical limits according to the valve, then the
valve controller, and finally the limit switch.
When adjustment is completed, turn the pointer
(109) so that the yellow line is parallel with the valve
closure member.
9.5
Removal of the limit switches for
accessing the valve controller
ND9100
Remove the cover (100) and the pointer (109).
Detach the cam discs (313).
Remove the LUI cabling from the circuit board.
Loosen the screws (303) and remove the housing
(300).
Remove the electronics cover (39).
Proceed with the valve controller as applicable.
Re-install the limit switch according to 9.2 and check
the adjustment according to 9.4.
ND9200, ND9300
Remove the cover (100) and the pointer (109).
Loosen the screws (314) in the cam disks (313) and
remove the cam disks and spacers (346) from the
shaft.
Remove the LUI cabling from the circuit board. Dis-
connect and remove all cabling which enters the
limit switch housing (300).
Remove screws (325), 3 pcs. and lift out the limit
switch base plate (324) complete with switches, LUI
and connector block.
Open screw (326) and turn the limit switch housing
(300) from the positioner housing.
Remove the electronics cover (39).
Proceed with the valve controller as applicable.
Re-install the limit switch according to 9.2 and check
the adjustment according to 9.4.
9.6
Circuit diagrams
The internal circuitry of the limit switch is shown in the con-
nection diagrams in 12.11 and inside the cover (not
ND9100H/I__).
9.7
Maintenance
Regular maintenance of the limit switch is not necessary.
10
TOOLS
Following tools are needed for the product installation and
service:
Flat screwdriver
0.4 x 2.5 x 80 mm
1.2 x 6.5 x 150 mm
Torx screwdriver
T10
T15
T20
Phillips screwdriver
PH1 x 60 mm
Allen key
2 mm
4 mm
5 mm
Other tools are depended on actuator where ND installed.
11
ORDERING SPARE PARTS
Spare parts are delivered as modules. The modules availa-
ble are indicated in 12.1 and 12.3.
When ordering spare parts, always include the following
information:
Valve controller type designation and serial number
from the ID plate
The code of this manual, the part number, the part
name and quantity required
Fig. 48
Limit switch adjustment, 2 switches
Open
Close
Ex WARNING:
The locking screw of the limit switch housing (Part
326) is essential to explosion protection.
The limit switch housing has to be locked in place for Ex d
protection. The screw grounds the limit switch housing to
the housing of the valve controller.
