Siemens RL Instruction Manual page 15

Maintenance
9. Clean any accumulation of dust or dirt from the circuit
breaker. For insulating parts, use a clean cloth saturated
with a non-toxic cleaner, such as denatured alcohol.
10. Bearing pins and other sliding or rotating surfaces should
be cleaned and then coated with a light film of grease.
(See Lubrication Chart, Table 5.)
1 1. Periorm a maintenance closing operation to check latch
and linkage movement. (Be sure to rotate the racking
screw to the TEST position to clear the spring discharge
interlock before attempting to charge closing springs).
12. Check circuit breaker adjustments. (See Adjustments.
Page 12.)
13. Exercise the circuit breaker through several close-open
cycles. For electrically operated circuit breakers,
operate the circuit breaker electrically. (Refer to the
specific wiring information for your circuit breaker to
determine where control voltage signals should be ap­
plied. Usually, spring charging power is connected be­
tween secondary disconnects SD12 and SD 16, closing
control power between 8D13 and 8D 16, and tripping
power between SD11 and 8D16 on the bottom). Examine
the operation of the circuit breaker during these opera­
tions for any evidence of difficulty, erratic operation, etc.
14. Test the tripping system, using an appropriate test set,
such as the Siemens Portable Static Trip Set, model
PTS-4. Refer to "Static Trip Ill Information and Instruction
Guide', SG-3118 and "Portable Test Set Instructions',
SG-3138 for information on testing. The test should in-
Figure 5. Maintenance Closing
Table 4. Maintenance Closing
Operation Procedure
Closing Contacts
1. Verify that racking mechanisms
is in TEST position.
2. Pull charging handle DOWN
ALL THE WAY (approximately
120.)
3. Place blade of screwdriver
1
between hood and spring release
I
latch and hold it in DOWN position.
4. Slowly return handle to vertical
position. Observe contact, touch.
mechanical operation, etc.
Opening Contacts
Push in manual trip rod.
elude tripping of the circuit breaker by the trip device.
This confirms the functionality of the system. including
the trip device and the tripping components.
15. Reinstall arc chutes. Close and open the circuit breaker
to ensure that the arc chutes do not interfere with circuit
breaker operation.
16. Turn the racking screw to the DISCONNECTED position,
and reinstall the circuit breaker in the cubicle.
17. Log the details of the maintenance into a suitable record
of circuit breaker maintenance for future use.
Maintenance Closing
Note: Holding the spring release latch down prevents the
stored-energy springs from propping in the charged position.
Thus. when the handle is slowly returned to the normal vertical
position. the energy in the springs is slowly released against
the closing handle assembly.
During inspection prior to installation, and for routine main­
tenance 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 charging handle assembly is aligned
with the holes in the operating mechanism frame, the pin
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
operations is the same for both the electrically operated and the
manually operated circuit breaker. Refer to Figure 5 and
Table4.
Adjustments
After is installed in the cubicle,
the circuit breaker
attempting to operate. the connected position alignment must
be checked. Two stop nuts are provided on the racking screw
to set the connected position. These are adjusted by setting
the angle of the racking clevis. as shown in Figure 4, and by
before
and