Adjustments - Siemens RL Series Instructions Manual

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
of
1 8. Turn the racking screw to the
reinstall the circuit breaker in the cubicle.
the t
1 9 . Log details e maintenance into a
h
circuit breaker maintenance for future use.
Table 4. Maintenance Closing
Operll tl on
Procedure
Verify
racki n g mechanism is in TEST
that
Closing Contacts
position.
charging
2 . P ull ha
(approximately 1 20'). Do not a
O'N'ar
to retum t d the vertical position
handle all the way down
Maintain firm g rip
3.
charg1ng handle to counteract force of
si n g s g
clo prin s ! Plaa! blade or screwdriver
between hood and
the latch in the DO'v'IN position.
Slowly
4 retum charging handle
Once charging han
may be
removed Observe contact to•Jch
mechanical operation,
Push in manual
Figure 5. Maintena nce Closing
DISCONNECT pos1tion,
and
suitable
record of
n le ALL THE W�.Y
d DO'v'IN
llow charging handle
� keep the
r e ssu on
and heavy p re
cha rged
spring r eas and hold
el e latch.
vert1cal
to position
e starts s.cr E:: w driver
dl to move.
etc.
- - ---
- A CAUTION
High-speed moving parts.
May cause personal injury.
When performing maintenance close operation.
mainta1n a firm g r
dunng the closing stroke to counteract the large
force in the closing springs.
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 m a intained, 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
Refer to
breaker. 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.
14
i
p on the manual charging handle
If
a f1rm grip (and