7 SG9H 70 en
25
8.3
Electrical connections
Before connecting the power, make sure that the electrical
specifications and the wiring meet the installation condi-
tions. See the diagrams in 10.6. Refer to the information on
the identification plate.
SG9_/D or SG9_/I:
Observe the functioning of the proxim-
ity switch; activated when the active face is either covered
or free.
8.4
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.
SG9_/D or SG9_/I:
Use the LED indicator or a sepa-
rate 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.
8.5
Removal of the limit switches SG9_/D_,
SG9_/R_, SG9_/I_ or SG9_/K_ for
accessing the valve controller
Remove the cover (100) and the pointer (109).
Loosen the screws (314) in the cam disks (313) and
remove the cam disks and bushings (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 8.2 andcheck
the adjustment according to 8.4.
8.6
Circuit diagrams
The internal circuitry of the limit switch is shown in the con-
nection diagrams in 10.6 and inside the cover.
8.7
Maintenance
Regular maintenance of the limit switch is not necessary.
9
TOOLS
Following tools are needed for the product installation and
service:
Flat screwdriver
0.5 x 3.0 x 75 mm
Torx screwdriver
T10
T20
Hexagon screwdrivers
3 mm
6 mm
10
ORDERING SPARE PARTS
Spare parts are delivered as modules. The available mod-
ules are indicated in 10.1.
When ordering spare parts, always include the following
information:
Type code, sales order number, serial number
The code of this manual, the part number, the part
name and quantity required
This information can be found from the identification plate
or documents.
Fig. 33
Limit switch adjustment, 2 switches
Fig. 34
Limit switch adjustment, 4 switches
Open
Close
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.
