Page
52
3.
Rotate the cylinders to obtain a clearance of approx-
imately 0.005 inch between the cylinders and the
stop levers.
4. Tighten the nuts on the bolts.
5-5.3 MOVING CONTACT ADJUSTMENT
The contact assemblies are adjustable for the amount of
engagement only. The lead of the arcing contacts over
the main contacts is fixed. The correct engagement of the
contacts is achieved when the vertical faces of the main
fixed contacts and the fixed contact cage are parallel.
For the
OSI
1-308,
this is obtained by the adjusting nuts
located on the insulating link stud above and below the
pivot block (Figures
3-4 and 3-5). These nuts are self-lock-
ing and must be tight when the adjustment is complete.
The moving pole of the DSll-516/620 is adjusted
by
rotating the insulating link after the locknut has been
loosened (Figure
3-6). Tighten the locknut securely after
the adjustment has been completed.
Figure
5-7
Levering Mechanism
l.B.
694C694-02
The DSll-632 and DSll-840/850 have two adjusting
studs on each pole.
Both adjusting studs must be moved together to retain
the parallelism. Refer to the Renewal Parts Data Book if
a pictorial reference is needed to make the adjustment.
A spring type locking clip holds the adjustment for the
DSll-632. For the DSll-840/850, locking nuts similar to
those used with the DSll-516/620 hold the adjustments.
5-5.4 LEVERING MECHANISM ADJUSTMENT
The complete levering mechanism is shown in Figure 5-
7. If the traveling stop nut on the rear of the worm shaft
has been removed, it must be replaced in the exact
position with respect to the worm gear position for prop-
er
interlock operation. This is achieved when the thread-
ed worm shaft bottoms in the stop nut and the interlock
cam is in the connected position (Figure
4-12a). The
shutter interlock pin will then drop to its normal position
beneath the lobe of the cam. The retaining clamp ring
also operates the position indicator and may be slipped
into its groove in the stop nut. The stop nut is prevented
Effective
07
/97
Courtesy of NationalSwitchgear.com
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