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12
O W I I I – I N D O O R D I S C O N N E C TO R
Coupling the drive with disconnector
NRWO4-3 manual drive coupling is done with rod
[pos. 14, Fig. 4] of adjustable length, which is con-
nected by pins with a lever [pos. 15, Fig. 4] that is
mounted on the disconnect shaft and that can be
adjusted every 10° of full angle range. The length of
the rod must be such that it guarantees the correct
position of the movable contacts in both of their
end positions. This will be reached when the discon-
nector shaft coupled to the drive will rotate 90°
(change of rotation angle from 115° on drive shaft
to 90 ° on the apparatus shaft). The approximate
position of the coupling rod and lever on the dis-
connector shaft is shown in Fig.4. For horizontally
installed disconnectors, there is need to exceed the
dead center in drive in open state of the disconnec-
tor, so the self-acting closing of switch is impossi-
ble. In the closed state of the disconnector (hand le-
ver in the up position), the movable contacts should
reach the position corresponding to the switched
on state. In the open position of the disconnector
(hand lever at the bottom), the movable contacts
of the apparatus should reach the correct position
defined by bumpers located on the shaft of the ap-
paratus and in the frame.
The length of the rod is adjusted by setting the dis-
connector and the drive in the closed position. After
adjustment the rod must be tighten by clamps.
These rules also apply when coupling the drive with
the shaft of the earthing switch.
—
Fig. 5.
—
Fig. 5.
HE manual drive
1) Drive's shaft
2) Locking ring
3) Cardan joint
4) Hand lever
2
4
1
4.7
Coupling with HE manual drive
The complete manual drive HE consists of a front
part of the drive (body) with a cardan joint [pos.3,
Fig. 5] and a hand lever [pos. 4, Fig. 5]. For coupling
with the disconnector there are additionally need-
ed: coupling rod and bevel gear on the disconnect
shaft. The drive HE has to be mounted on front
panel of switchgear with two M10 screws, in such
position that the axis of drive's shaft [pos. 1, Fig. 5]
is as close as possible to the axis of the smaller
wheel of bevel gear. The coupling rod require to be
cut to the proper length and then hole ø10 for fas-
tening into the cardan joint need to be drilled.
Drive regulation:
1) Remove the Seeger Ring securing the lock ring
[pos. 2, Fig. 5] (using the Seeger rings pliers).
2) Insert the hand lever into the shaft end [pos. 1,
Fig. 5] of the drive and turn counterclockwise
to open the disconnector. Observe that the
lock ring has reached the correct position in
the open state. If not, remove the ring from the
shaft [pos. 1, Fig. 5] and rotate 1-2 teeth on the
shaft and mount it again.
3) Turning the hand lever clockwise close the dis-
connector. If necessary, change the position of
the ring [pos. 2, Fig. 5] on the shaft again.
4) The regulation procedure should be completed
by several closing and opening operations, and
then the Seeger ring should be mounted on its
place.
3
Rotating angle 180°
Holes for mounting
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