Siemens RL Series, Инструкция по эксплуатации

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Maintenance
Excessive test vottages may result in damage to
equipment.
Do not perlorm dielectric tests at test voltages
exceeding the ratings ol the tested equ1pment
1 8. Turn the racking screw to the
DISCONNECT pos1tion,
and
reinstall the circuit breaker in the cubicle.
1 9 . Log
the
details
of
t
h
e maintenance into a
suitable
record of
circuit breaker maintenance for future use.
Table 4. Maintenance Closing
Operlltlon
Procedure
Closing Contacts
Verify
that
racki n g mechanism is in TEST
position.
2.Pull
charging
h a
n
d
le
DO'v'IN
ALL THE W�.Y
(approximately 1 20'). Do not a llow charging handle
to retum t O'N'ar d the vertical position � keep the
handle all the way down
3. Maintain firm g rip and heavy p r
e
ssu r e on
charg1ng handle to counteract force of
charged
cl o
si n g s
prin
g
s! Plaa! blade or screwdriver
between hood and spring r e l eas e latch. and hold
the latch in the DO'v'IN position.
4
Slowly
retum charging handle t o vert1cal position
Once charging han d l e starts to move. s.crE::wdriver
may be removed Observe contact to•Jch
mechanical operation,
etc.
- - ---
Contacts
Push in manual rod.
Figure 5. Maintenance Closing
14
- ACAUTION
High-speed moving parts.
May cause personal injury.
When performing maintenance close operation.
mainta1n a firm g r
i
p on the manual charging handle
dunng the closing stroke to counteract the large
force in the closing springs.
If
a f1rm grip (and
heavy pressure) is not mamtained, the circu1t
breaker may close suddenly, which WI" return the
charging handle to the vertical position with consid­
erable force
IMPORTANT: The procedure in Table 4 should be used for
maintenance closing only. The circuit breaker must be on a
table with the arc chutes removed during any maintenance
close operation. Maintain a firm grip on the manual charging
handle d uring the closing stroke to counteract the large force
in the closing springs.
If a firm grip (and heavy pressure) is
not maintained, the circuit breaker may close suddenly,
which will return the charging handle to the vertical position
with considerable force.
Note: Holding the spring release latch down prevents the
stored-energy springs from propping in the charged position.
Thus, when the handle is returned to the normal vertical position,
the energy in the springs is released against the closing handle
assembly. A firm grip must be maintained on the charging handle
to counteract the energy stored in the charged closing springs. As
the handle is slowly released to the normal vertical position, the
main contacts are slowly moved to the closed position.
During inspection prior to installation, and for routine maintenance
inspections, the circuit breaker contacts may be closed slowly to
check clearances, contact adjustments, and movement of links
and latches.
Electrically operated breakers normally do not have a manual
charging handle, but it is available as a maintenance item. When
the hole in the maintenance closing handle assembly is aligned
with the holes in the operating mechanism frame, t h e pi n which is
attached to the cam is inserted. This pin holds the assembly in
place and acts as a pivot point for the cam. After insertion of the
maintenance closing handle assembly on the electrically operated
breaker, the actual maintenance closing operation
is the same for
both the electrically operated and the manually operated circuit
breaker.
Refer to
Figure 5 and Table 4.
Adjustments
On the small frame breakers two stop nuts are provided on the
racking screw to set the connected position. Initially these are
adjusted by setting the racking clevis angle to 90 degrees, as
shown i n
Figure 4,
and by tightening the nuts against the stop
washer (1 09). The two nuts ( 1 1 0) are then locked against each
other. When the circuit breaker is installed in a cubicle the actual
connected position should be checked, using the interlock rod and
its mating hole in the cubicle before attempting to operate the
breaker.
The adjustment on the large frame breakers is made by shims
mounted on the top of the racking block. Removing shims allows
the racking mechanism to move the breaker farther into the
cubicle.
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