Table of Contents
Advertisement
I N S TA L L AT I O N A N D O P E R AT I O N M A N U A L
4.4 Adjusting the mechanical interlock between
For transportation disconnectors equipped with
earthing switch have closed contacts of both discon-
nector and earthing switch. Therefore, before install-
ing the device to the support structure, the mechani-
cal interlock of the disconnecting shaft and earthing
shaft must be adjusted by opening the earthing
contact and then setting the locking ring [pos. 25,
Fig. 3] on the earthing shaft according to Fig. 3. The
ring must be fixed in this position with screw.
—
Fig. 3.
4.5 Mounting disconnector on support structure
When installing the disconnector, make sure that
the base is not twisted. The apparatus must be
pre-screwed in three points, and then, if neces-
sary, some pads should be placed under the base
to align the support structure at the fourth screw.
The disconnector base cannot be bent to the sup-
port structure by tightening the screws. Other-
wise, twisted disconnector base will cause:
—
Fig. 4.
—
Fig. 3.
Adjusting the mechanical
interlock of earthing
switch
—
Fig. 4.
Example of coupling the
drive NRWO4-3 witch
disconnector, mounting
holes pattern.
14) Coupling rod
15) Lever
disconnector and earthing
15
Holes pattern for drive mounting
a) excessive torque increase on the disconnect
shaft required for switching
b) deterioration of the simultaneity of closing and
opening the disconnector poles. With correctly
installed disconnector, the simultaneity of unit
should not exceed 3 mm
c) deterioration of contact when disconnector is
closed. The correct installation of the discon-
nector has linear contact and the 0,1 mm width
feeler cannot be placed between fixed and the
movable contact
d) offset of working planes between disconnector
contacts and earthing switch contacts which
cause the earthing contacts do not reach proper
position and do not match to the fixed contacts
while closing
4.6 Mounting and regulation of manual drive
NRWO4-3
25
Mounting of drive
The structure on which the drive is mounted
should be rigid and the drive cannot move rela-
tive to the disconnector cooperating with it. The
location of mounting holes to be made in the
switchgear wall for the fastening of drives is
shown in Fig. 4. The drive should be fixed to the
wall from the inside of the switchboard with four
M10 screws. After fastening the drive, the blockade
should be mounted. The lock can be mounted on
the right or left side of the drive.
Caution: For safety reasons, each drive should have
a lock.
14
55
92
15
11
Advertisement
Table of Contents
