I.
B.
694C694-02
from rotating by having a "flat" against the bottom of the
breaker horizontal top pan.
During reassembly, care must be taken to insure that
the two guide spacers are located
in
the slots of the top
pan. This permits the mechanism to float. Screws
should be tightened and then backed off one half turn to
allow the mechanism to float.
5-6 LUBRICATION
In
general, the circuit breaker requires only moderate
lubrication at regular intervals. The use of a special
lubricant is required
in
a few places, and must be
applied with care. Only small quantities are needed. All
excess must be removed with a clean cloth to prevent
any accumulation of dust or dirt. Avoid getting any lubri-
cant
on
insulation or other electrical parts. Care must be
taken to prevent any of the molybdenum lubricant from
reaching any current carrying contact surface.
5-6.1 LUBRICATION FREQUENCY
Under normal operating conditions, refer to Table
5.1
for
the recommended lubrication frequency for DSll circuit
breakers by frame size. Special conditions, such as con-
taminated environments, high temperatures and exces-
sive humidity, might dictate that a different schedule be
considered.
NOTICE
Any circuit breaker that has been stored should be
operated a minimum
of
five times before being put
in service.
5-6.2 LUBRICANT LOCATION
NOTICE
All parts
of
the levering mechanism have sufficient
lubrication, and should not require any further
attention (Figure
5-7).
Effective
07
/97
Page
53
The following numbered lubrication point references cor-
respond to the numbers shown on Figures 5-8 through
5-12.
Molykote BR-2 Plus by Dow Corning (Molybdenum
Disulphide
in
Lithium Grease) or equivalent should be
used sparingly
on
the following:
II
Spring-charge indicator surface engaging with the
cut-off switch link
El
Cam surface operating the cut-off switch link
II
Pins on both ends of constraining link
11
Shunt trip moving armature surface
II
Curved surface of trip latch
II
Spring release moving armature surface
II
Several trip shaft points
Bl
Surface of cut-off switch link
El
Main spring pins on each end of crankshaft and
fixed ends
Im
Rear face of oscillator
A WARNING
BE CERTAIN THAT CIRCUIT BREAKER CONTACTS
ARE OPEN AND CLOSING SPRINGS DISCHARGED
AFTER COMPLETING MAINTENANCE ACTIVITIES.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY.
Table
5.
1 Lubrication Frequency
DSll-308, DSll-508, DSLll-308
DSll-608, DSll-516, DSll-616,
DSll-620, DSLll-516, DSLll-620
DSll-632, DSll-840/850
Interval*
(Breaker Cycles)
1750
500
250
*
Breaker Cycle - one no load open/close operation.
Courtesy of NationalSwitchgear.com
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