SECTION 3
–
Inspection Before Initial Energizing
of an LBS Switch
NOTE!
Page 4
Each switch is properly adjusted at the factory before
shipment. However, vibration and mechanical stresses
imposed by transit and installation can adversely affect
switch adjustment; therefore, a final inspection is
essential before energizing. If this inspection reveals
the switch has come out of adjustment, the switch
should be re-adjusted according to alignment
procedures in Section 5.2.
Inspection procedures require closing and opening the
switch with the main door open. This requires override
of the switch safety interlock as described in Section
5.3.1 and must be accomplished before energizing.
Fig. 2
Main Blade Adjustment
Inspection Procedure:
a.
With the switch in the open position (see Fig.
2) the distance between the edge of the main
blade and the closest point of the break jaw
should be
6-5/8"+/- 1/8
".
b.
Main and flicker blades must be in proper
alignment with break jaws and arc chute
openings respectively. This can be checked
by closing the switch and then partially
opening it using the maintenance hub as
described in Section 5.1.3.
c.
In the closed position the drive rod links and
shaft ears must be 1/16" to 1/8" over toggle
when checked with a straight edge (see Fig.
3).
d.
With the switch closed, the upper spacers of
the main blades should rest 3/16"+/-1/16"
above the bottom of the depression of the
stationary break jaw (see Fig. 4).
e.
With the switch closed, each main blade
assembly should engage the break jaw such
that the back of the blades is between flush
and 1/8” from flush with the top of the vertical
surface of the break jaw (see Fig. 10).
1/16” to
1/8” gap
Fig. 3
Drive Rod Links and Shaft Ears Alignment
6-5/8”
gap
Special
Torque
setting per
Sec 5.2.6
3/16”
gap
Fig. 4
Main Blade Spacer Adjustment
f.
When LBS fuse mountings are supplied,
check to ensure the fuse mountings are
securely fastened and fuses are properly
clamped in place. Ensure all threaded
fasteners are torqued to the appropriate value
in section 6.0.
h.
Wipe away any dust or dirt that may have
accumulated in the switch or fuse
compartments, paying particular attention to
insulators and insulating material.
