Siemens RL Instruction Manual page 7

Fuse Carriage
4. Check current ratings, wiring information, circuit breaker
type and static trip type against the one line diagram to
assure that circuit breakers and fuses are located in the
proper compartments within the switchgear.
Note: The separately mounted fuse carriage is made with
a key interlock that requires that they be used in specific
compartments. Refer to nameplate on fuse carriage for
compartment number.
5. Check the alignment of the secondary disconnect fingers
to ensure against misalignment due to possible distortion
of fingers during shipment and handling.
6.
Close the compartment door and secure the latches prior
to racking to or from the CONNECTED position. Also
close compartment door prior to closing the circuit
breaker when in this CONNECTED position. Once the
circuit breaker is closed, keep the door closed.
7. Once the circuit breaker and fuse carriage are energized,
they should not be touched, except for the exterior con­
trols.
Installation Seque nce
A DANGER
Heavy weight overhead.
Can cause death, personal injury or
property damage
Always use approved lifting means to handle
circuit breakers or fuse carriages. Follow
instructions for use of lifing bar assembly.
Avoid excessive speeds and sudden stops.
Never lift a circuit breaker or fuse carriage
above an area where ersonnel are located.
1. Take the key for the FUSE CARRIAGE from its associated
CIRCUIT BREAKER compartment.
2. Using the proper lifting equipment and following the
instructions Step 4 (photo sequence A-D) on Page
circuit breaker installation, insert the FUSE CARRIAGE
into its proper compartment. Observe labeling. Unlock
the racking mechanism using the key from the circuit
breaker compartment. Check that the racking clevis
engages the pins in the compartment.
Use the racking crank to rotate the racking screw in a
clockwise direction until the fuse carriage reaches its
CONNECTED position:
3. Close the fuse carriage compartment door.
4. Operate the key interlock on the fuse carriage, which
allows the key to be removed. Use the key to operate the
key interlock in the associated CIRCUIT BREAKER cell.
5. Using lifting equipment, insert the circuit breaker into its
compartment. Push the circuit breaker until the racking
clevis engages the cubicle pins. See Instructions Step 4
A-D) (Page 5).
(photo sequence
6.
Close and trip the circuit breaker. Refer to OPERATING
PROCEDURE, Pages 6-9 for manually and electrically
operated breakers.
20
During the closing operation, observe that the contacts
move freely without interference or rubbing between mov­
able arcing contacts and parts of the arc chutes. Then
refer to Operation, Pages 6-9 of this manual for a detailed
description of the circuit breaker operating characteristics
before putting the circuit breaker in service.
7. Trip units and accessory devices should receive a
thorough check prior to placing the circuit breaker in
service to be certain that adjustments are correct and
parts are not damaged. Refer to "Static Trip Ill Information
and Instruction Guide", SG-3118.
8. Draw out circuit breakers are equipped with a drawout
interlock to prevent movement of a closed circuit breaker
into or out of the connected position. See Drawout Inter­
lock Page 9 for a description of the interlock. Its operation
be
should checked before the circuit breaker is ener­
gized. The fuse carriages are interlocked with a key and
lock system to assure that the circuit breaker is OPEN
(see Key Interlock System, Page 21) before the fuse
carriage can be racked in or out.
9. Upon completion of the installation inspection, the circuit
breaker is ready to be energized after the control wiring,
if any, is checked and the insulation tested. (Also see
Testing Open Fuse Trip Attachment, Page 21.)
10. Close the compartment door. Rack the circuit breaker
into its connected position. Remove the racking crank,
close the racking window, and check that the open fuse
trip attachment is reset. The circuit breaker can now be
operated in its normal manner.
11. To remove the Circuit Breaker/Fuse Carriage reverse the
above procedures.
Fuses
Only special purpose fuses per Siemens drawing number
71-142-200 can be used with the circuit breaker /fuse carriage
combination. Fuses of different manufacture will not mount on
the fuse carriage terminals.
Only fuses of the same current rating should be used for
5
for
replacement of any open fuses.
Trigger
Fuses and Open Fuse
The fuse carriage has provisions for mounting three trigger
fuses that are connected in parallel with the main power fuses.
They are used to indicate which of the power fuses opened
under a system fault. Operation of the open-fuse trip attach-
Hazardous voltage.
Can cause death, severe personal injury,
electrical shock b urns or property
damage.
Line voltage may be present inside trigger
fuse assembly. Do not remove trigger fuse
cover when circuit breaker is in CONNECT
Trip
Attachment
WARNING
A
sition.