7 VG9H 70 en
27
8.2
Installing limit switches on ValvGuard
If the ValvGuard is already mounted on an actuator/
valve assembly, operate the actuator into the closed
or open position.
Remove the cover (100), the pointer (109), the LUI
(223) and electronics cover (39).
Turn the shaft (311) onto the shaft (11). Fasten the
screw (312) using a locking agent such as Loctite.
Mount the electronics cover (39) and the limit switch
housing (300) on the ValvGuard. Lock the housing in
place with screw (326). Install the base plate (324)
with the limit switches and connector block into the
limit switch housing. Fasten the base plate with
screws (325), 3 pcs.
Install the cam discs (313) and bushings (346) to the
shaft.
Mount the LUI (223) on the holder (306).
Replace the plastic plugs with metal ones in conduit
entries which will not be used.
Mount the pointer (109) on the shaft (311). Adjust
the limit switch according to 8.4.
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 11.6. Refer to the information on
the identification plate.
VG9_/D_ or VG9_/I_:
Observe the functioning of the prox-
imity switch; activated when the active face is either cov-
ered or free.
8.4
Adjustment of limit switches
The pointer (109) need not be removed for adjustment.
When the limit switch is ordered together with the valve
and the actuator, the switches are factory-adjusted. The lim-
its may be adjusted by altering the position 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.
VG9_/D_ or VG9_/I_:
Use the LED indicator or a sep-
arate measuring instrument as an aid.
After re-installation of the actuator, first adjust its
mechanical limits according to the valve, then the
ValvGuard, 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
Position transmitter (T01) calibration
instructions
The position transmitter (T01) needs to be calibrated
according to the valve operation direction; clockwise (CW)
to open or counter clockwise (CCW) to open. The calibra-
tion is carried out once VG9000 is connected to the actua-
tor and the valve is in closed position (when using rising
signal to open configuration). For correct calibration of the
position transmitter follow these instructions:
Loosen the potentiometer set screw located on the
potentiometer outer surface and disconnect the
potentiometer cable plug from the transmitter
board terminal pins.
Adjust the potentiometer unit to correct angle by rotat-
ing the inner section of the potentiometer (smaller
diameter cylindrical part on top side of the potentiom-
eter unit). The correct angle depends on the valve oper-
ation orientation; CCW or CW to open (see Fig. 38). The
centerline mark on the potentiometer side helps align-
ing the potentiometer for initial position. Make sure
that the valve and axis stay stationary in closed position
when adjusting the potentiometer orientation.
For closed position the resistance value of the poten-
tiometer should be adjusted between 400-
600 ohms. Measure the resistance by connecting an
ohm meter to terminal connector at potentiometer
cable. For CW to open applications measure the
resistance between the yellow and red leads, for
CCW to open applications measure the resistance
between green and red leads.
Table 8
Ambient temperatures, Ex ia/ib
Variant type
II 1 G Ex ia IIC T6…T4 Ga / II 2 G Ex ib IIC T6…T4 Gb
Ambient temperature ranges
T6
T5
T4
VG9_X_
VG9_X_/I02
-40…+50 °C
-40…+65 °C
-40…+64 °C
-40…+80 °C
VG9_X_/I09
VG9_X_/I45
VG9_X_/I57
VG9_X_/I58
-25 ... +50 °C
-25…+65 °C
-25…+64 °C
-25…+80 °C
Table 9
Ambient temperatures, Ex nA/ic
Variant type
II 3 G Ex nA IIC T6…T4 Gc / II 3 G Ex ic IIC T6…T4 Gc
Ambient temperature ranges
T6
T5
T4
VG9_X_
VG9_X_/I02
-40…+60 °C
-40…+ 75 °C
-40…+ 85 °C
VG9_X_/I09
VG9_X_/I45
VG9_X_/I57
VG9_X_/I58
25…+60 °C
-25…+ 75 °C
-25…+ 85 °C
Fig. 36
Limit switch adjustment, 2 switches
Fig. 37
Limit switch adjustment, 4 switches
Close
Open
Open
Close
