Siemens RL Series User manual
A
DANGER
Hazardous voltages and high-speed moving parts.
Will
cause
death,
serious
personal
injury
or
equipment or property damage.
Always de-energize and ground the equipment before
maintenance.
Read
and
understand this instruction
manual
before installing, operating, or maintaining the equipment.
Maintenance should be performed only
by
qualified
personnel. The use
of
unauthorized parts
in
the repair
of
the equipment or tampering by unqualified personnel
will result
in
dangerous conditions which will cause death
or serious personal injury or
equipment
or property
damage. Follow
all
safety instructions contained herein.
IMPORTANT
The
information contained herein
is
general
in
nature
and
not intended for specific
application purposes. It does not relieve the user
of
responsibility to use sound
practices
in
application, installation, operation,
and
maintenance
of
the equipment
purchased. Siemens reserves the right to make changes
in
the specifications
shown herein or to make improvements at
any
time without notice or obligations.
Should
a conflict
arise
between the
general
information
contained
in
this publication
and
the contents of drawings or supplementary material or both, the latter
shall
take precedence.
QUALIFIED
PERSON
For the purpose
of
this manual and product labels a qualified person
is
one
who
is
familiar with the installation, construction, operation, or maintenance
of
the
equipment and the hazards involved.
In
addition, this person
has
the following
qualifications:
(a)
is
trained and authorized to energize, de-energize, clear, ground, and tag
circuits and equipment
in
accordance with established safety practices.
(b)
is
trained
in
the proper
care
and
use
of protective equipment
such
as
rubber
gloves,
hard
hat,
safety
glasses
or face
shields,
flash
clothing, etc.,
in
accordance
with established safety
practices.
(c)
is
trained
in
rendering first
aid.
NOTE
These instructions do not purport
to
cover
all
details or variations
in
equipment, nor to provide for every possible
contingency to be
met
in
connection with installation, operation, or maintenance. Should further information
be
desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the
matter should be referred to the local Siemens sales office.
The
contents
of
this instruction manual shall not become part of or modify any prior or existing agreement, com-
mitment or relationship. The sales contract contains the entire obligation of Siemens Energy & Automation, Inc.
The
warranty
contained in
the
contract
between
the
parties is
the
sole
warranty
of
Siemens Energy &
Automation, Inc. Any statements contained herein do not create
new
warranties or modify the existing warranty.
Courtesy of NationalSwitchgear.com
Type
RL
Low
Voltage
Circuit
Breakers
Table of Contents
Introduction and Safety ................................................2 Fuse Carriage .......................................................22-25
Introduction and Safety....................................................2 Introduction ....................................................................22
Introduction ......................................................................2 Description .....................................................................22
Qualified Person ...............................................................2 Precautions.....................................................................23
Signal
Words
....................................................................2 Installation Sequence.....................................................23
Dangerous Procedures.....................................................2 Fuses..............................................................................24
Field Service Operation....................................................2 Trigger Fuses and Open Fuse Trip Attachment ............
24
Key Interlock System .....................................................
24
Installation ................................................................3-5 Testing Open Fuse Trip Attachment..............................25
Introduction ......................................................................3 Maintenance...................................................................25
Receiving and Inspection
for
Damage.............................3
Storage .............................................................................3 Optional Devices.......................................................
26
General .............................................................................3 Operation Counter..........................................................
26
Installation (and Removal) Sequence...............................4 Maintenance Closing Device .........................................
26
Electrically Operated Interlock.......................................26
Operation.............:...................................................6-10 Undervoltage Trip Device (late 1996 and after) .............26
Description .......................................................................6 Undervoltage Trip Device (up
to
late 1996) ...................
26
Precautions
to
be Observed
in
Operation........................6 Latch Check Switch .......................................................26
Manually Operated Circuit Breakers ..............................,.6 Static Trip Ill Overcurrent Device...................................26
Electrically Operated Circuit Breakers..............................9
Drawout lnterlock.............................................................9 Bell Alarm Switch...........................................................26
Mechanical Lockout ....................................................
.'
..
26
Racking Mechanism.........................................................9
Spring Discharge Interlock.............................................10 Parts......................................................................27-53
Table
of
Contents...........................................................27
Maintenance.........................................................11-18
How
to
Use Your Parts Ordering Guide ........................27
General ...........................................................................
11
Ordering Example ..........................................................27
Service Conditions and Maintenance lntervals..............
11
Lubrication......................................................................
11
Recommended Annual
RL
Circuit
Breaker Inspection Procedure........................................12
Recommended
RL
Breaker
Maintenance and Lubrication Procedure .......................13
Maintenance Closing......................................................14
Adjustments...................................................................14
Main Contact Make........................................................15
Arcing Contact Make......................................................15
Contact Replacement.....................................................15
Main Contact Fingers.....................................................15
Stationary Arcing Contact...............................................16
Hinge Contact Fingers....................................................16
Movable Arcing and Main Contact.................................16
Tripping Actuator Operation and Replacement .............16
Static Trip Ill Overcurrent Devices.................................16
Motor
Cutoff Switches...................................................18
Lubrication.................................................................19
Circuit Breaker Lubrication Chart ...................................19
Fuse Functions .....................................................20-21
Current Limiting Fuses...................................................20
Open Fuse Trip Device...................................................
20
I
Cover
1796-96
Courtesy of NationalSwitchgear.com
Introduction
and
Safety
Introduction
The
RL
family
of
low
voltage
AC
power
circuit breakers is
designed to meet
all
applicable
ANSI,
NEMA
and
IEEE
standards.
Successful
application
and
operation
of
this
equipment
depends
as
much upon proper installation and maintenance by
the user
as
it does upon careful design and manufacture by
Siemens.
The purpose
of
this Instruction Manual is
to
assist the user
in
developing safe and efficient procedures
for
the installation,
maintenance and use
of
the equipment.
Contact the nearest Siemens representative
if
any additional
information is desired.
A
DANGER
Hazardous voltages and high-speed moving parts.
Will
cause
death,
serious personal
injury
or
property damage.
To
avoid
electrical
shock,
burns
and
entanglement
in
moving parts, this equipment
must
be installed,
operated
and
maintained only
by
qualified persons
thoroughly familiar with the equipment, instruction
manuals and drawings.
Read
and understand this
instruction manual
bE;fore
using the equipment.
Qualified
Person
For the purpose
of
this manual and product labels a Qualified
Person
is
one
who
is
familiar
with
the installation, construc-
tion or operation
of
the equipment and the hazards involved.
In
addition, this person has the following qualifications:
• Training and authorization
to
energize, de-energize,
clear. ground and tag circuits and equipment
in
accor-
dance with established safety practices.
•Training
in
the proper care and use
of
protective equip-
ment
such
as
rubber gloves, hard hat, safety glasses,
face shields, flash clothing, etc., in accordance
with
established safety procedures.
•Training
in
rendering first
aid.
Signal Words
The signal words "Danger", "Warning" and "Caution" used
in
this
manual indicate
the
degree
of
hazard
that
may
be
encountered by the user. These words are defined
as
follows:
2
Danger -Indicates
an
imminently
hazardous situation
which, if not avoided, will result
in
death or serious injury.
Waming -Indicates a potentially
hazardous
situation which, if
not avoided, could result
in
death or serious injury.
Caution -indicates a potentially hazardous situation which,
if not avoided, may result
in
minor or moderate injury.
Dangerous Procedures
In addition to other procedures described in this manual
as
dangerous, user personnel must adhere
to
thefollowing:
1. Always
work
on de-energized equipment. Always de-
en
erg
ize
a
breaker,
and
remove
it
from
the
switchgear before performing any tests, maintenance
or repair.
2. Always discharge energy from closing and opening
(tripping) springs before performing maintenance on
circuit breakers.
3.
,Always let an interlock device or safety mechanism
perform its function without forcing or defeating the
device.
Field Service Operation
Siemens can provide competent, well-trained Field Service
Representatives
to
provide technical guidance and advisory
assistance
for
the installation, overhaul, repair and mainte-
nance
of
Siemens
equipment,
processes
and
systems.
Contact
regional
service
centers,
sales
offices
or
the
factory
for
details,
or
telephone
Siemens
Field Service at
1-800-241-4453.
Courtesy of NationalSwitchgear.com
Installation
Introduction
Type
RL
Low
Voltage
AC
Power Circuit Breakers may be fur-
nished for mounting in any one
of
three ways:
1.
In
switchboards or
in
metal enclosed switchgear
of
the
drawout type;
2.
In
individual metal enclosures (drawout type);
3. For stationary mounting
in
the user's own enclosure or
switchboard.
All
RL
circuit breakers are completely assembled, tested, and
calibrated at the factory
in
a vertical position and
..
must
be so
installed
to
operate properly.
The.
user's.primary connections
must
be adequately braced against the effects of
short
cir-
cuit currents
to
prevent overstressing the circuit breaker ter-
minals.
Receiving and Inspection for Damage
IMPORTANT: Do not accept the statement from any
driver
that
the
damaged equipment was not properly
packaged by shipper.
Do not sign Bill
of
Lading
without
notation of visible
damage if observed. Our equipment packaging meets
the
rigid
requirements
established
by
the
trucking
industry.
You
must
obtain carrier inspectioll within 15 days of
receipt
on
damaged equipment.
Immediately upon receipt
of
this equipment, carefully remove
all
packing braces. Examine parts
and
check them against the
packing list
and
note any damage incurred
in
transit
If
damage
is disclosed, a carrier inspection
must
be arranged for by
consignee within 15 days of receipt of equipment. If equipment
is shipped F.O.B. Destination, the consignee must obtain the
original
of
the carrier inspection report and notify Siemens
immediately.
Two shipping methodS are used with
RL
circuit breakers:
1.
Individually skidded with protective covering.
2.
Within a cubicle.
Note
all
caution tags, remove any blocking,
and
open circuit
breaker contacts before installation.
Storage
Whenever possible, install circuit breakers
in
their assigned
switchgear compartments
for
storage. Follow instructions
contained
in
the instruction manual for types R
and
SR
Low
Voltage Metal-Enclosed Switchgear,
SG-3088.
When the circuit
breaker
is
stored separately, place the circuit breaker
on
a sturdy
pallet. Secure the circuit breaker
to
the pallet.
and
cover
with
polyethylene film at least 1Omils thick. Also obseNe the following:
1.
Indoor Storage -Whenever possible, store
the
circuit
breaker indoors. The storage environment must be clean,
dry and free
of
such conditions
as
construction dust, corro-
sive atmosphere, mechanical abuse
and
rapid temperature
variations.
2.
Outdoor Storage -OUTDOOR
STORAGE
IS
NOT
REC-
OMMENDED. When no other option is available, the cir-
cuit breaker
must
be completely covered and protected
from
rain,
snow, dirt
and
all
other contaminants.
3. Space Heating -Space heating
must
be used for both
indoor and outdoor storage
to
prevent condensation and
corrosion. Space heaters
of
approximately 100 watts per
breaker are recommended. ·tf
the
circuit
breakers are
stored inside their assigned switchgear compartments,
and the switchgear is equipped
with
space heaters, the
switchgear space heaters should be energized.
General
The
·RL
Low
Voltage
AC
Power Circuit Breaker is completely
adjusted, tested and inspected before shipment. However, a
careful check should be made
to
be certain that shipment or
storage has not resulted
in
damage or change of adjustment.
Circuit breakers
and
their enclosures should be installed in a
clean, dry, well-ventilated
area
in
which the atmosphere
is
free
from destructive acid or alkali fumes. For stationary breakers
and custom enclosures, the factory should be consulted for
minimum clearances and required ventilation openings.
Before installing, make certain that the circuit breaker contacts
are
in
the
open
position
and
that the closing springs
are
discharged.
Be
sure
to
lubricate primary
and
secondary disconnect fingers
with Siemens electrical contact lubricant, part
no.
15-171-370-002.
.A
DANGER
Hazardous voltages
and
high-speed moving
parts.
Will
cause death, serious personal injury
or
property damage.
To avoid electrical shock, burns and entanglement
in
moving parts, this equipment
must
be installed,
operated and maintained only by qualified persons
thoroughly familiar
with
the equipment, instruction
manuals
and
drawings.
A
WARNING
Heavy weight overhead.
Can cause
death,
serious personal injury
or
property damage.
Always use approved lifting means
to
handle cir-
cuit breakers or fuse carriages. Follow instructions
for
use
of
lifting bar assembly. Avoid excessive
speeds and sudden stops. Never
lift
a circuit break-
er
or
fuse carriage above
an
area
where personnel
are located.
3
Courtesy of NationalSwitchgear.com
Installation
Installation (and Removal) Sequence
IMPORTANT:
Be
certain
that
you check points 1a
through 1f
below
before placing circuit breaker in
compartment.
1.
Determine the correct switchgear compartment for
each
circuit breaker by checking the One-Line Diagram and
Schematic Diagram furnished with the drawings. These
drawings show the following for each circuit breaker
compartment:
a.
Circuit breaker Type
(RL-800,
RL-1600
etc.)
b.
Trip "XFMR" or "SENSOR" rating
c.
Static Trip
Type
(RMS-TS-TZ,
RMS-TIG-TZ
etc.)
d.
Type
of operator (Manual Operator-MO or Electrical
Operator-EO)
e.
Circuit breaker wiring information.
f.
Special
accessories (Undervoltage Trip, etc.)
2.
On
fused breakers, make sure trigger fuse linkage is
reset. Breaker will remain trip free
as
long
as
this linkage
is
tripped. Refer to 'Open
Fuse
Trip Device'
on
Page 20.
3.
If the circuit breaker was shipped separate from the cubi-
cle, remove any blocking, trip the circuit breaker and
move
the
racking
mechanism
to the
DISCONNECT
position.
4.
To
prepare circuit breaker for insertion into the cubicle,
follow steps
A-D
of Figure 1
on
Page
5.
5.
Push
breaker to
DISCONNECT
position. Interlock
bar
pre-
vents movement
of
breaker in cell, unless trip bar is
depressed.
6.
While holding the trip
bar
in,
open the racking window
and
insert the racking crank.
7.
Use
crank to
rack
breaker into cell.
8.
Check
door iris for free movement while closing door,
9.
To
remove
circuit
breaker,
reverse
the above
procedures.
10.
After the circuit breaker
is
placed
in
the compartment,
rack
it to the
TEST
position.
11.
Open the compartment door. Close
and
trip the circuit
breaker. Refer to 'Operation', Pages 6-10 for manually
and
electrically operated breakers.
4
During the closing operation, obseNe that the contacts
move free!y without interference or rubbing between
moveibie arcing contacts and parts
of
the arc chutes.
Then
rnfe1
to 'Operation', Pages 6-10
for
a detailed
descrip1ior of the circuit breaker operating characteristics
before
p!.acing
the circuit breaker
in
seNice. Make sure
circuit~
are
not energized.
12.
Trip units
and
accessory devices should receive a thor-
ough check before placing the circuit breaker
in
seNice.
This check makes certain that adjustments are proper
and parts are
not
damaged. Refer
to
'Static Trip
Ill
Information
and
Instruction Guide',
SG-3118.
13.
Drawout circuit breakers
are
equipped with
an
interlock
to prevent movement of a closed circuit breaker into or
out of the
CONNECT
position. Circuit breaker interlock
operation should
be
checked before it
is
energized.
See
'Drawout
Interlock'. Page 9, and 'Spring Discharge
Interlock', Page 10, for a description of these interlocks.
14.
After completing the installation inspection, check the
control wiring (if
any)
and
test the insulation.
15. Close the compartment door.
Rack
the circuit breaker
into
the
CONNECT
position.
Refer
to
'Racking
Mechanism', Page 9. Remove the racking crank and
close the racking window.
16.
The
circuit
breaker
can
now
be
closed
to
energize
the
circuit.
A
WARNING
Heavy weight.
Can cause death, serious personal injury or
property damage.
Use
of
a lifting device or crane will place heavy
weights overhead. Avoid excessive speeds and
sudden starts or stops.
Never lifta circuit breaker or fuse carriage over
an
area
where personnel are located.
Courtesy of NationalSwitchgear.com
Installation
Heavy weight.
Can
cause
death,
serious
personal
injury
or
property
damage.
Use of a lifting device
or
crane will place heavy weights over-
head. Avoid excessive speeds and sudden starts or stops.
Never lift a circuit breaker
or
fuse carriage over an area
where
personnel are located.
A)
Attach lifting bar assembly
to
circuit breaker
as
shown
above. Fasten locking screws through circuit breaker side
plates and lifting plates.
Bl
Attach
crane
hook
and
insert
crank
into hoist mechanism
eye.
Raise breaker above compartment, and fully extend rails.
C)
Lower
breaker
onto
rails.
Important!
The
rear
of the
breaker
must be tilted downward so that the breaker engages the
notch at the rear
of
the right hand
rail
(shown
in
circle).
0)
Continue lowering until circuit breaker rests securely on
the rails. Remove the lifting yoke. The circuit breaker is
now
ready for inserting into the cell.
Figure
1.
Use of Lifting
Bar
Assembly
to
Handle Circuit Breakers or Fuse Carriages 5
Courtesy of NationalSwitchgear.com
Operation
Description
The continuous current and interrupting ratings
of
the circuit
breakers
are
as
shown on the circuit breakerrating label.
The circuit breakers
are
also available with integrally mounted
current limiting fuses through 2000A frame size, and
with
separately mounted fuses
for
3200A, 4000A. and 5000A
frame size. For 800A. 1600A. and 2000A frame sizes
the
basic circuit breakers are the same
with
or
without
fuses.
The fuses
mount
on a bracket
that
is bolted
to
the
side
plates and upper studs on the back
of
the circuit breaker.
Due to this difference, fused circuit breakers are not inter-
changeable with unfused circuit breakers.
The
current limiting
fuses increase the interruption rating
to
that
of
the fuses.
Fused circuit breakers are identified
as
RLF-800, RLF-1600,
RLF-2000, RLF-3200, RLF-4000, or RLF-5000. Fused circuit
breakers
are
also
equipped
with
an
open
fuse trip
device
to
open
the circuit breaker if one or more current limiting fuses open.
Note: Fused circuit breakers are not physically inter-
cbahgeable with unfused breakers.
Unfused circuit breakers
can
also be supplied for stationary
mounting
in
which the racking components are omitted and
brackets are provided for mounting
to
a stationary frame.
All
RL
circuit breakers use the same basic closing mechanism
or operator. The closing springs used vary between sizes.
Two cqnfigurations of the operator
are
available
for
charging
the
closing
springs,
manually
charged
or electrically
charged.
For
elec-
trical
operators, a maintenance
handle
accessory
can
be
used
to
charge
the springs manually for maintenance or
in
an
emergency.
Optionally,
a
built-in
manual
spring
charging
handle
can
be
provided.
The manual and electrical operators are identical except for
the means of supplying energy to the closing
springs.
Adouble-
toggle, trip-free mechanism is used. This means
that
the
breaker contacts are free
to
open at any
time
if
required,
regardless
of
the position
of
the mechanism.
Precautions
to
be Observed in Operation
1.
Read
this Instruction Manual before installing or making
any changes or adjustments on the circuit breaker.
2.
Stored-energy closing springs may be charged with circuit
breaker contacts
in
either the open or closed position.
EXTREME
CARE
SHOULD
BE
TAKEN
TO
DISCHARGE
THE
SPRINGS
BEFORE
WORKING
ON
THE
CIRCUIT
BREAKER.
3.
When
closing manually operated breakers
out
of
the
compartment, the racking mechanism must
be
returned to
the
TEST
position before the closing spring
can
be
charged.
4. When charging manually operated breakers. always hold
the handle firmly until it is returned to the normal vertical
position.
A ratchet insures that the
spring
charging
operation
must
be
completed once started.
5.
Check current ratings, circuit breaker wiring information,
circuit breaker type and trip
device
type, against the One-
Line Diagram to assure that circuit breakers are located
in
the proper compartments within the switchgear.
6
6.
Check the alignment
of
the secondary disconnect fingers.
This
ensures against misalignment due to possible distortion
of
fingers during shipment
and
handling.
7.
Close the compartment door and secure door latch(es)
prior
to
racking
the circuit
breaker
to or from the
CONNECT
position. Also close
and
latch the door prior to closing
the
circuit breaker when
in
the
CONNECT
position. Once the
circuit breaker
is
closed, keep the door closed.
8. ONCE THE CIRCUl"t
BREAKER
OR FUSE CARRIAGE IS
ENERGIZED,
DO
NOT
OPEN
THE
COMPARTMENT
DOORS.
PERFORM
ANY
REQUIRED
OPERATIONS
WITH
EXTERNAL
CONTROLS,
WITH
THE
DOORS
CLOSED AND SECURELY LATCHED.
A
WARNING
Hazardous voltages.
Can cause death, serious personal injury or
property damage.
Keep
compartment doors closed
and
securely latched
when equipment
is
energized.
Manually Operated Circuit Breakers
The breaker has a center-mounted frame, so many
of
the
latches
and links are arranged in pairs. For
descriptive
purposes, they will be referred
to
as
single items. Refer to
Figure 2
and
Table
1.
Detail A shows the position of the trip.
latch and toggle linkage when the circuit breaker
is
open and
the closing springs
are
discharged.
Table 1. Operating Procedure for Manually Operated Circuit
Breakers
Operation Procedure
Charging Springs
Pull
charging handle down
all
the way (approximately
120°) and return
it
to
normal vertical
position.
(Engagement
of
pawl
with
ratchet teeth prevents
handle
reversal
until
the
downward
stroke
is
completed.)
Closing Push down firmly on spring-release latch hood
(50)
after handle
is
returned
to
normal vertical position.
Tripping Push in manual trip rod
(94)
OR
If shunt trip is provided, operate external control
switch (CSffi
to
trip or open position.
(See
Figure 3.)
Movement
of
the charging handle downward rotates closing
ratchet.(140) against roller
(43),
thus pivoting closing
cam
(34)
clockwise about pin
(40).
This extends the closing springs
through link
(41)
and
spring hanger
(58).
Rotation of cam
(34)
allows roller
(27)
in
toggle linkage to be
moved
into position
shown
in
Detail
B.
Kickoff spring
(1
O)
moves
rollers away from
the stop block
(7).
Then, the toggle linkage is
moved
by torsion
spring until latch
(15)
clears trip flap
(12).
Spring
(13)
causes
trip flap
(12)
to reset under latch
(15).
Trip flap
(12)
should nor-
mally stop against the front surface
of
latch
(15).
When the closing springs
are
fully charged, roller
(43)
engages
latch
(47).
Closing
ratchet
(140)
engages
a pawl
in
such
a manner
that
the
charging cam
must
complete the charging stroke
before it
can
return to its normal position.
Courtesy of NationalSwitchgear.com
Operation
CC
.........Circuit
Breaker
Closing
Coil
TC
..........Circuit
Breaker
(Shunt)
Trip
Coil
Y............
Aux.
Closing
Relay-Anti-Pump
MCO
......Motor Cutoff Switch
88
..........
Spring
Charging
Motor
CS!C
......Control Switch -
Close
Contact
CS/T
.......Control Switch
Trip
Contact
R............
Red
Indicating
Lamp
G............
Green
Indicating
Lamp
a............
Aux.
Switch Contact -
Open
when
Breaker
is
Open
b............
Aux.
Switch Contact -
Closed
when
Breaker
is
Open
MDS
......Motor Circuit
ON-OFF
Switch
~
..........
Secondary
Disconnect
AL
..........
Alarm
Contact
CB
.........Connection
Block
-c----------~-r
rure1--1---7i
~
,
Diagram
shows circuit
breaker
in
OPEN
position with closing
springs
discharged.
CONTROL
POWER
SUPPLY
5
I
_J_
CS
.L~
.LI,
J
-1-
C
'G
7R
I - -
cs
I 1
t_Jr
A 1 A A
12 13 14
11
12Y
4E
7
b
8
3 6
2-
fl'~E
~
15
r:--'-''--_-=-
-
-··
-·
- -
-.
7_
I I I
a~v'
.J,,·t
AL
1
--10
I I
7
5~ 3~
~ ~ ~
I I I
I I I
Figure
3.
Typical
Schematic
-
Electrically
Operated
Circuit
Brecikers.
8
Courtesy of NationalSwitchgear.com
Operation
With
the charging handle in its normal upright position, the
circuit breaker
can
be closed. By pressing firmly
on
hood
(50),
latch
(47)
will disengage roller
(43).
Then, closing springs cause
closing
cam
(34)
to rotate against the toggle rollers
(27),
moving
the toggle into its upright position,
as
shown
in
detail
C.
The
closing cycle can be interrupted at any point by operation
of
one
of
the tripping means. This will cause rotation of trip flap
(12)
to a position that releases latch
(15),
allowing toggle linkage
to
collapse to the position shown
in
detail
A.
To
manually open the circuit breaker, press
in
manual trip rod
(94).
This bar engages the top
of
trip flap
(12),
to
disengage
the latch
(15).
'
Electrically Operated Circuit Breakers
The
mechanism of the electrically operated circuit breaker
is
the
same
as
the manually operated circuit breaker, except that the
manual
charging handle
is
replaced by a motor
and
gear system.
Refer to Figure 2
and
Table
2.
Power available to the control
circuit will start the automatic charging cycle. The motor gear
box pinion rotates gear
(81)
counterclockwise.
Cam
follower
(82)
engages
an
arm of wind
and
close cam
(34),
which rotates the
cams
in
the same manner
as
for the manually charged circuit
breaker.
When the wind
and
close
cam
(34)
reaches
its
charged
position, the back of the
cam
engages switch lever
(73),
rotating
the lever away from the switch operator.
Gear
switch lever
(76)
will still be holding the switch in the operate position
and
the
motorwill continue
to
run
until the
roll
pins
on
the side of
gear
(81)
lift lever
(76)
clear. This releases the motor cutoff switch (MCO).
When the MCO switch opens, the motor stops,
and
the closing
coil circuit is set up through one side of the MCO switch.
The circuit breaker
can
now
be closed by depressing the latch
hood
(50)
or by energizing
the
closing coil
(CC)
through the
external close control switch
(CS/Cl.
When the close circuit
is
energized, the anti-pump
(Y)
relay
is
energized
and
opens the
Y relay contact
in
the closing circuit. This prevents "pumping"
or repeated attempts
to
close the circuit breaker if a tripping
signal or fault is present. This
would
happen if the closing
switch
(CS/C)
is
bypassed by a short circuit, or if it
is
defective.
A combination manually
and
electrically operated circuit breaker
is also available. This includes both the motor-gear charging
system
as
well
as
the manual charge handle.
Note: Manual charging handle must be
in
vertical position
during electrical charging.
Table 2. Operating Procedure for Electrically Operated Circuit
Breakers
Operation
Procedure
Charging Springs Energize control circuit.
Closing
After
springs are charged, actuate external close
control switch (CS/Cl,
OR
Push down firmly on spring-release latch hood
(50)
(after spring charging handle (if present)
is
returned
to
normal vertical position.)
Tripping Actuate external control
switch
(CS/Tl
to
trip
or
open position,
OR
Push
in
manual trip rod
(94).
Drawout Interlock
A drawout circuit breaker mechanism includes:
1.
Means
to
rack the circuit breaker
in
or out
of
the com-
partment.
2.
Interlock
to
prevent racking a closed circuit breaker into or
out of any position.
3 Interlock to prevent closing a circuit breaker until
it
is
racked
to
the
TEST
or CONNECT position.
4.
Interlock
to
prevent withdrawing a circuit breaker from the
cubicle while the closing springs are charged.
Racking Mechanism
Refer to Figure
4.
With the circuit breaker resting
on
the cubicle
rails,
the following sequence should be used
to
rack the circuit
breaker into the cubicle.
1.
Push
trip
bar
in,
open
racking
window
and
insert
racking
crank.
Note: Racking
window
cannot be opened unless manual
trip bar is pressed
in.
While the trip bar is pressed
in,
the
circuit breaker is
TRIP
FREE
and
cannot be closed.
2.
Using the racking crank, rotate the racking screw (105)
counterclockwise until the racking shaft
is
in
the DISCON-
NECT position. The racking clevis can
now
engage the
racking pins
in
the cubicle. The circuit breaker should
now
be pushed along the
rail
into the DISCONNECT position.
Double check that the racking clevises engage the pins
on
both sides of the cubicle.
3.
Clockwise rotation
of
the
racking
screw
will
rack
the
breaker into the
TEST
position.
At
the
TEST
position, the
racking
window
can
be closed, allowing the trip bar
to
reset
and
the circuit breaker
can
be
operated. Further
racking
will
place
the
circuit
breaker
between
the
TEST and
CONNECT positions. Between positions, the interlock bar
will
not
engage
the
position holes
of
the cubicle. The
breaker will be held
TRIP
FREE
and
cannot be closed.
In
the CONNECT position,
the
interlock will engage the
cubicle hole and reset, allowing the circuit breaker
to
be
closed. This prevents closing a circuit breaker which is not
in
the CONNECT or
TEST
position.
4.
To
withdraw
the breaker
from
the
CONNECT position,
rotate the racking screw counterclockwise.
5.
Before attempting to operate the circuit breaker, the position
of
the device should be checked
with
reference
to
the
holes
in
the cubicle, to be certain that it is fully connected.
See
'Adjustments',
Page
14
for proper procedure.
IMPORTANT: To avoid damage
to
the racking mecha-
nism, when in the CONNECT position, do not forcefully
rotate the racking crank clockwise.
9
Courtesy of NationalSwitchgear.com
Operation
Note
2:
Drawout
interlock
rod
extends
through
hole
in
compartment
side
rail
in
CONNECT
l:L":"::.-:::.~-::.~-::.'.':-::.:-::.~-::.-J_~~=====and
in
TEST
positions.
Figure 4. Detail of Typical Racking Mechanism
10
Spring Discharge Interlock
When racking
the
circuit breaker
out
to
the
DISCONNECT
position, the closing springs will automatically discharge, at or
before reaching
the
DISCONNECT position. The barrel
nut
(109)
engages the spring interlock. This,
in
turn,
is
connected
to
the manual close hood which releases the closing springs. -
IMPORTANT: On manually charged breakers,
the
close
hood
is
interlocked
to
the-manual charge cam, and must be
clear before racking the circuit breaker
to
the DISCONNECT
position. For this reason,
the
manual charge handle must
be in
the
vertical position during racking.
Note: The racking mechanism
must
be returned
to
the
TEST
position before closing springs
can
be charged (either
in
the cubicle or when removed from the cubicle).
The spring discharge interlock produces
TRIP
FREE;
operation
in
which
all
of
the stored energy of the springs
is
dissipated
in
the mechanism. It is preferable
to
turn the motor power
off
in
the
TEST
position, close
and
trip the circuit breaker manually
in
that position,
and
then rack out
in
the normal manner.
Courtesy of NationalSwitchgear.com
Maintenance
General
For
the safety of maintenance personnel
as
well
as
others who
might
be
exposed
to
hazards associated
with
maintenance
activities, the safety related work practices
of
NFPA
70E,
parts
II
and
Ill, should always
be
followed when working
on
electrical
equipment. Maintenance personnel should
be
trained
in
the
safety practices, procedures and requirements that pertain to
their respective job assignments. This Instruction Manual
should
be
reviewed
and
retained
in
a location readily accessible
for reference during maintenance
of
this equipment.
The
user must establish a periodic maintenance program to
ensure trouble-free and safe operation. The frequency
of
inspection, periodic cleaning and preventive maintenance
schedule will depend upon the operating conditions. NFPA
Publication 708, 'Electrical Equipment Maintenance' may
be
used
as
a guide
to
establish such a program. A preventive
maintenance program is not intended
to
cover recondi-
tioning or major repair,
but
should be designed
to
reveal,
if possible,
the
need for such actions in
time
to
prevent
malfunctions during operation.
Service Conditions and Maintenance Intervals
'Usual' and 'Unusual' service conditions
for
Low
Voltage
Metal-Enclosed Switchgear are defined in ANSI C37.20.1,
clauses 3 and 7.1. Generally, 'usual service conditions' are
defined
as
an
environment in
which
the equipment is not
exposed to excessive dust, acid fumes, damaging chemicals,
salt
air,
rapid or frequent changes in temperature, vibration,
high humidity, or extremes
of
temperature.
This
definition
is
subject
to
a
variety
of
interpretations.
Because
of
this. you
are
best served by adjusting maintenance
and lubrication intervals based on your experience
with
the
actual service environment.
The
frequency of required maintenance depends
on
the nature
of the service conditions; the more severe the conditions, the
more frequently that maintenance
is
needed. Table 3 gives
service and lubrication intervals for type
RL
circuit breakers
applied
under
ANSI
'Usual
Service
Conditions'.
This
table
indicates
that
RL
circuit breakers (with
'LM'
in
the type designation
on
the rating
label)
have
a five (5) year maintenance interval.
Regardless of the length of
the
maintenance (lubrication)
interval,
the
tripping system should be checked and exer-
cised annually, and
the
circuit breaker should
be
inspect-
ed and exercised annually.
Always inspect a circuit breaker which
has
interrupted a heavy
fault current.
.A.DANGER
Hazardous voltages and high-speed moving
parts.
Will cause death, serious personal injury, and
property damage.
Always
de-energize and ground
the
equipment
before maintenance.
Read instruction manuals, obseNe safety instruc-
tions, and limit use
to
qualified personnel.
. .A.WARNING
Failure
to
properly maintain
the
equipment can result in death,
serious injury or product failure, and can prevent successful func-
tioning ofconnected apparatus.
The instructions contained herein should be carefully reviewed, under-
stood, and followed.
The following maintenance procedures
must
be performed regularly:
• Recommended annual
RL
circuit breaker inspection procedure
• Recommended
RL
breaker maintenance and lubrication procedure.
The above list does not represent
an
exhaustive survey
of
maintenance steps necessary to ensure safe operation
of
the
equipment.
Particular
applications
may
require
further
procedures.
Should
further information
be
desired
or
should
particular
problems
arise
which
are
not covered sufficiently for the user's purposes,
the matter should
be
referred to the
local
Siemens
sales
office.
The use of unauthorized parts in
the
repair of
the
equipment, or
tampering
by
unqualified personnel
will
result in dangerous
conditions which can cause death, serious injury or equipment
damage. Follow all safety instructions contained herein.
Lubrication
Lubrication should be a part
of
the servicing procedure. Old
grease should
be
removed from bearing pins
and
other non-
current
carrying
rotating or sliding
surfaces.
A thin film of lubricant
should be applied
in
accordance with the 'Lubrication Chart',
Table5.
Apply lubricants with care to avoid getting grease on insulating
members, since it may affect the dielectric strength.
Faces
of
arcing contacts
and
faces of main contacts should not
be
lubri-
cated. The rubbing surfaces (i.e., those surfaces
without
brazed-on contact tips)
of
the main contact fingers, arcing
contact fingers,
and
hinge contact fingers should
be
lubricated
with a coating
of
Siemens electrical contact lubricant. part
no.
15-171-370-002. If dust or dirt
has
accumulated, disassembly
may be necessary to clean
and
relubricate these points. See
'Contact Replacement',
Page
15
and
'Lubrication
Chart',
Table
5.
11
Courtesy of NationalSwitchgear.com
Maintenance
Recommended Annual
RL
Circuit Breaker
Inspection Procedure
A suggested procedure to follow during Annual Inspections:
1.
De-energize
the
primary and control circuits.
2.
With the cubicle door closed, rack the circuit breaker to
the DISCONNECT position.
3.
Open the cubicle door, and remove the circuit breaker
from the cubicle.
4.
Rotate
the
racking
screw to the
TEST
position
(approximately
3 turns) to clear the spring discharge interlock, before
attempting to charge closing springs. 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
applied. Usually, spring charging power
is
connected between secondary disconnects SD12 and
SD16, closing control power between SD13 and SD16,
and
tripping power between
SD11
and
SD15. Secondary
disconnects
are
arranged with
SD1
on top,
and
SD16
on
the bottom). Examine the operation of the circuit breaker
during these operations
for
any evidence
of
difficulty,
erratic operation, etc.
Table 3. Inspection
and
Maintenance Intervals
(see
Note
1)
5.
Test the tripping system, using
an
appropriate test set,
such
as
the Siemens Portable Static Trip Test 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 include
tripping of the circuit
breaker
by
the trip
device.
This
confirms
the functionality
of
the system, including the trip device
and
the tripping components.
6.
Clean any accumulation
of
dust or dirt from the circuit
breaker.
For
insulated parts, use a clean cloth saturated
with a non-toxic cleaner, such
as
denatured alcohol.
7.
Turn the racking screw to the DISCONNECT position,
and
reinstall the circuit breaker
in
the cubicle.
Recommended
RL
Breaker Maintenance
and
Lubrication Procedure
A suggested procedure
to
follow
during maintenance and
lubrication sessions:
1.
De-energize
the
primary and control circuits.
2.
With the cubicle door closed, rack the circuit breaker to
the DISCONNECT position.
3.
Open the cubicle door, and remove the circuit breaker
from the cubicle.
Inspection Interval Maintenance & Lubrication Interval Overhaul
All Type
RL
Breakers Interval
Frame Check & Exercise
RL
Breakers built
Size
Tripping System before
6/91
Amperes (Number of operations,
Check & Exercise or time, whichever
Circuit Breaker Mechanism occurs first)
800 Annually 1750 operations/1 year
1600 Annually 500 operations/1 year
2000 Annually 500 operations/1 year
3200 Annually 250 operations/1 year
4000 Annually 250 operations/1 year
5000 Annually 250 operations/1 year
Notes:
1.
Any circuit breaker which has interrupted a heavy fault
current should
be
inspected according to the recommended
procedure for maintenance
and
lubrication.
2.
"LM"
indicates Low Maintenance
RL
Breaker produced
beginning June,
1991
12
RL
breakers built All Type
6/91
or later
RL
breakers
(with
"LM"
in
(Number of
type designation- Operations)
See
Note2)
5 years 12500 operations
5 years 4000 operations
5 years 4000 operations
5 years 1500 operations
5 years 1500 operations
5 years 1500 operations
A.DANGER
Hazardous voltages and high-speed moving
parts.
Will cause death, serious personal injury, and
property damage.
Always de-energize and ground the
equipment
before maintenance.
Read
instruction manuals, observe safety instruc-
tions, and limit use
to
qualified personnel.
Courtesy of NationalSwitchgear.com
Maintenance
4.
Rotate the racking screw to the
TEST
position (approxi-
mately 3 turns) to clear the spring discharge interlock. This
is
necessary before the closing springs
can
be charged,
and
also makes removal
of
the arc chutes easier.
5.
Remove arc chutes and examine arc chutes and circuit
breaker contacts for burned, cracked, or broken parts.
To remove arc chutes, proceed
as
follows:
a.
Remove mounting screws for holding clips, remove
support
and
phase barriers.
b.
Liftarc chutes vertically
to
clear arc runners.
6.
Inspect arc chutes for excessively burned arcing plates.
Replace arc chutes under the following conditions:
a.
Copper-plated steel plates
in
the arc chutes measure
less
than 0.06" thickness for
RL-800
through
RLE-2000
circuit breakers.
b.
Copper-plated steel plates
in
the arc chutes measure
less
than
0.08" thickness for
RL-3200
through
RL-5000
circuit breakers.
7. Wipe the contacts
with
a clean cloth saturated
with
a non-
toxic cleaning fluid, such
as
denatured alcohol.
8.
Replace badly burned
or
pitted contacts. (See 'Contact
Replacement', Page 15,
and
'Lubrication Chart', Table
5.)
Do not lubricate faces of contacts.
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.)
11. Perform a maintenance closing operation (see Page 14
and
Table
4)
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 14.)
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 applied. Usually, spring charging power
is
connected between secondary disconnects
SD12
and
SD16,
closing control power between SD13
and
SD16,
and
tripping
power between
SD11
and
SD15. Secondary disconnects
are arranged with
SD1
on
top,
and
SD16
on
the bottom).
Examine the operation of the circuit breaker during these
operations for
any
evidence ofdifficulty, 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 include
tripping ofthe 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.
A megger test should be made
on
the high voltage circuit
to
be sure
that
all
connections
are free
of
undesired
grounds. A meggertest
is
also
advisable
on
the control circuit.
17. A dielectric test, if possible, should be made
on
the high
voltage (power) circuit for one minute at
the
appropriate
test
voltage. (Voltage transformers, control
power
trans-
formers, surge arresters, and surge capacitors
must
be
disconnected during this test).
Note: Do not perform dielectric tests on the Static Trip Ill
tripping system. Refer
to
'Static Trip Ill Information and
Instruction Guide', SG-3118.
Rated voltage
of
circuit Test voltage
480 or 600 volts 75%
of2200=1650VAC
208 or 240 volts 75%
of
1500 = 1125
VAC
Secondary & control circuits 75%
of
1500 = 1125
VAC
Note: Certain control devices. such
as
motors
and
motor
circuits, should be tested at 675
VAC.
Electronic devices
should be tested at the voltages specified
in
the instruction
manual for the electronic device).
Dielectric tests are also recommended
when
new
units
are added
to
an
existing installation, or after major field
modifications. The equipment should be put in good condi-
tion prior
to
the field test. It
is
not expected that equip-
ment shall be subjected
to
these tests after it
has
been
stored for long periods of time or
has
accumulat!'ld a large
amount
of
dust, moisture, or other contaminants without
being first restored
to
good condition.
.A.CAUTION
Excessive
test
voltages may result in damage
to
equipment.
Do
not
perform dielectric
tests
at
test
voltages
exceeding the ratings ofthe tested equipment.
18. Turn the racking screw
to
the DISCONNECT position,
and
reinstall the circuit breaker
in
the cubicle.
19. Log the details
of
the maintenance into a suitable record
of circuit breaker maintenance for future use.
13
Courtesy of NationalSwitchgear.com
Maintenance
Figure 5. Maintenance Closing
Maintenance Closing
li1gh·speed moving parts.
May
cause personal injury.
When performing maintenance close operation,
maintain a iirm grip on the manual charging handle
dunno the closing stroke to counteract
the
large
force
~n
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.
IMPORTANT: The procedure
in
Table 4 should be used
for maintenance closing only. The circuit breaker mustbe on
a table
with
the
arc
chutes removed during any maintenance
close operation. Maintain a firm grip on the manual charg-
ing
handle
during
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: Hoiding 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.
14
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
1s
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
operation is the same for both the electrically operated
an.d
the
manually operated circuit breaker. Refer to Figure 5
and
Table
4.
Table 4. Maintenance Closing
Operation Procedure
Closing Contacts
1.
Verify that racking mechanism is
in
TEST
position.
2. Pull charging handle
DOWN
ALL
THE
WAY
(approximately 120°).
Do
not allow charging handle
to
return toward the vertical position -keep the
handle
all
the way down.
3. Maintain firm grip
and
heavy
pressure
on
charging handle
to
counteract force of charged
closing
springs!
Place
blade
of
screwdriver
between hood and spring release latch, and hold
the latch
in
the DOWN position.
4.
Slowly return charging handle to vertical position.
Once charging handle starts to move, screwdriver
may be removed. Observe contact, touch, mechanical
operation, etc.
Opening Contacts Push
in
manual trip
rod.
Adjustments
After the circuit breaker
is
installed
in
the cubicle, and before
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
tightening the nuts against the stop washer (109). The
two
nuts (110) should be locked against each other.
During maintenance inspections, the following items should
be checked to ensure that the original settings
are
maintained:
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 main-
tenance close operation. Maintain a
firm
grip
on
the
man-
ual charging handle during
the
closing stroke
to
counter-
act
the
largeforce
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.
Courtesy of NationalSwitchgear.com
Maintenance
Main
Contact
Make
(See
Figure
8)
Compression
of
the contact fingers (46)
must
be between
.093" and .125" (2.4-3.2mm). This is the difference between:
1.
The measurement from the breaker base to the bottom
edge
of
the finger contact surface when the breaker is
open, and
2.
The measurement
in
the same place when the breaker
is
closed.
For
RLE
version breakers, the measurement is made
.25"
from the bottom edge of the finger contact surface.
For convenience, a GO/NO-GO feeler gauge (part no. 18-658-
143-214)
can
be used to measure the gap between the con-
tact finger
(46)
and
the extruded portion
of
the upper contact
assembly
(37).
This measurement is made with the breaker
closed. The outside
contacts
(46) on each pole
must
be
checked and adjusted, such that the
GO
end of the gauge
can
be inserted into the gap
all
the
way
to the front surface
of
the
contact finger's vertical portion. The
NO-GO
end should not be
able
to
be fully inserted. Figure 6
shows
the GO/NO-GO
gauge and the manner
in
which
it
is
inserted between the con-
tact fingers
(46)
and the upper contact assembly
(37).
Figure 7
shows use
of
the GO/NO-GO gauge on
an
RL
circuit breaker.
Adjustment is provided by positioning screws
(78)
after loos-
ening nuts (80). Counterclockwise rotation
of
screws (78)
increases compression. Carefully torque nuts
(80)
to 30-60
inch-pounds after adjustment.
It
it is desired to check contact pressure, a push-type spring
scale
can
be used to compress contact fingers
(46)
with break-
er open. Contact pressure should be
between
20 and
30
pounds (9.1-13.6
kg)
on each finger.
Arcing Contact
Make
Adjustment
of
the arcing contacts
is
dependent on the adjustment
of
the main contact make (com-
pression)
as
discussed
in
the previous paragraph. Arcing con-
tact pressure should
be
between 20
and
40 pounds (9.1-18.2
kg)
when checked with a pull-type spring scale at the
base
of
the arcing contact tip insert with the circuit breaker contacts
closed. Measure the pressure on each blade separately.
GO/NO-GO
GAUGE
18-658-143-214
-
MAIN
CONTACT
(37)
PIVOT
CONTACT
(46)
"GO• END
MUST
INSERTTO FRONT
STOP SURFACE OF
PIVOT
CONTACT.
Figure
6. Use
of
the
GO/NO-GO Gauge
to
Check Main
Contact Make (Compression)
Figure 7. Check
of
Main Contact Make (Compression) Using
GO/NO-GO Gauge
Contact Replacement
(See
Figure
8)
The contact structure
consists
of
main current carrying contacts and arcing contacts
arranged so that initial contact make and final contact break is
by means
of
the arcing contacts. The actual contact surfaces
are
clad with
an
alloy facing which greatly reduces mechanical
wear and arc erosion.
When inspection
of
the alloy facing indicates that the contacts
should
be
replaced,
it
should
be
noted that hinge contact fin-
gers
(53,
55),
main contact fingers
(46),
and arcing contacts
(61) are spring loaded. Therefore, care
must
be used in
removal
and
installation of any of the contacts.
Main Contact Fingers
(See
Figure
8)
With the circuit breaker contacts open
and
the stored energy
springs discharged, the main contact fingers (46) may be
removed by loosening screws
(44,
45) enough to relieve the
compression
on
springs
(47,
48).
There are
two
springs behind
each finger. It is important that they be positioned properly
upon reinstallation. If difficulty is experienced
in
correctly posi-
tioning these springs, the upper and lower primary discon-
nects (168 Figure
18),
may be removed from each phase and
the circuit breaker tipped to rest on the ends
of
connectors
(37)
and
(49).
After the contact fingers
are
replaced, connector
(37)
should
be
positioned
in
the center of the slot
in
the molded
base
to
assure
correct alignment ofthe
primary
disconnect
fingers.
15
Courtesy of NationalSwitchgear.com
Maintenance
Stationary Arcing Contact
(See
Figure
8)
The stationary arcing contact is a part
of
a connector
(37)
and
may be replaced by proceeding
as
above.
In
this case, screws
(44,
45)
must
be
removed. However, to provide clearance for
removal
of
connector the backpanel
(33)
may have
to
be
loos-
ened
by
removing screws (58, 59 and 23, Figure 17). By
removing pin
(98
and 99 Figure 18), the entire assembly
can
be lifted out.
Hinge Contact Fingers
(See
Figure
8)
Hinge contact fingers
(53,
55)
may
be
removed
as
follows:
Remove backpanel. Remove lower connector
(49)
and moving
contacts by removing screws
(59).
The springs (54, 56) are
unloaded by rotating the moving contacts toward a horizontal
position relative to the stationary contact
(49).
Remove screws
(70)
to remove moving contacts. Slide fingers
(53,
55)
side-
ways to remove. Replace fingers by compressing spring
(56,
54)
in
position and inserting the fingers from the side. Holding
connector
(49)
in avise aids the operation.
MovableArcing and Main Contact
(See
Figure
8)
Either movable arcing contact
(61
),
or main contact
(62),
or
both, may be removed and replaced
as
follows:
IMPORTANT: Extreme care should
be
taken
to
hold
the
assembly
firmly
to
retain spring seat (83, 84) and
spring (81, 82) upon removal ofthe screws (78).
Remove lower connectors and moving contacts
as
described
in
the
preceding section. The
complete
movable
contact
assembly may
now
be brought to the bench. The location
of
spacers should be
noted.
Loosen
nuts
(80) and
remove
screws
(78)
from pin
(71),
alternate several turns each side
to
prevent binding.
The movable arcing contact
or
main contact may
now
be
replaced. Compress spring (81, 82)
to
engage screws
(78).
The reverse procedure is
followed
for
reinstallation. Care
should be taken
to
replace spacers correctly. Check alignment
and adjustment
of
contacts upon reassembly.
16
Tripping Actuator Operation and Replacement
When the overcurrent trip device senses a circuit condition
that requires the circuit breaker to open,
it
produces
an
output
that
is
fed to the tripping actuator. This device then causes the
circuit breaker contacts to open
and
isolate the circuit.
Mounted on the circuit breaker, the tripping actuator is held
in
a charged position by a permanent magnet. When the overcur-
rent trip device issues a trip signal, the coil
of
the tripping actu-
ator is energized, which causes the magnetic flux to shift to a
new
path, releasing the stored energy
of
a spring located
inside the tripping actuator. The spring provides the energy to
trip the breaker, moving the trip-flap clear
of
the toggle latch.
If the spring-loaded armature does not reset during trip opera-
tion, spacer washers may be added to obtain positive reset
of
the armature. If adding spacers does not cause the armature
to be reset, the tripping actuator should be replaced (if breaker
mechanism is not at fault).
Note:
Do
not attempt to disassemble the tripping actuator
as
this may destroy the magnetic field set up by the perma-
nent magnet
and
will render the actuator latch inoperative until
magnetized.
When replacing a tripping actuator, the coil leads must be con-
nected
to
the terminal block
of
the trip device
in
the correct
polarity relationship.
Static Trip Ill Overcurrent Devices
The black lead
of
the coil must be connected
to
terminal
6,
the
red lead
of
the coil connected
to
terminal
7,
and the blue lead
of
the coil to terminal 8
of
the static trip device.
When
the
tripping actuator has been replaced, the circuit
breaker should be tested
to
ensure proper operation
of
all
components.
Refer
to
'Static
Trip
Ill
Information
and
Instruction
Guide',
SG-3118,
and
'Portable
Test
Set
Instructions',
SG-3138,
for the information on testing the static
tripping system
on
a circuit breaker.
Courtesy of NationalSwitchgear.com
Maintenance
Motor
Cutoff Switches (for Electrically Operated Circuit
Breakers)
Figure 9a. Position
1.
Springs discharged; motor
in
run
position.
Position
1.
Springs Discharged: Motorin
Run
Position.
(Note that Figures 9a-9c are depicted
as
viewed from below)
In
Figure 9a, note that spring position lever
(1)
is forward,
actuating both
switches.
Motor/gear
position lever
(2)
is
retracted.
Motor
cutoff switch
(3)
is closed. Application
of
power at this time will cause the motor
to
start, thereby charg-
ing the closing springs.
Figure 9b. Position
2.
Springs charging; motor not yet cutoff.
Position 2. Springs Charging: Motor NotYet Cutoff.
While the springs are charging the motor/gear position lever
(2)
moves forward, applying pressure to the switch actuating
leaf. The spring position lever
(1)
retracts
as
the springs
reach
full charge. The
motor
cutoff
switch
(3)
is closed and the
motor is running.
18
Figure 9c. Position
3.
Springs charged; motor stopped.
Position 3. Springs Charged: Motor Stopped.
The springs have reached charged position. The motor/gear
lever
(2)
has
been retracted by roll pins
on
the large gear
as
the cam follower
(82,
Figure
2)
on
the large spur gear
has
dis-
engaged from the wind and close cam
(34,
Figure 2). The
motor
cutoff
switch
(3)
has
opened, stopping the motor and
the
closing coil switch
(4)
has closed. Upon application
of
power to the closing circuit. the breaker will close. Switches
then return to position 1 (Figure 9a).
Note:
In
position
3,
there
is
clearance
between both levers
and
the switch actuating leaf. Clearance may
be
minimal (approxi-
mately 1/64") or up to 1/16" (0.4-1.6mm). It is important to
completely remove pressure from the switch actuating leaf to
be
sure that the switches
are
free to actuate. Adjustment is
made by carefully bending the levers
as
indicated by arrows
(items 1
and
2).
Do
not bend the switch actuating leaf.
IMPORTANT:
If
the
motor cutoff switch (3) does
not
open,
the
motor will continue
to
run and
the
cam follower (82,
Figure 2) will re-engage wind and close cam (34, Figure 2)
jamming
the
entire mechanism, possibly stripping gears
in
the
gear motor, blowing
the
control fuse, or damaging
the motor. To free a jammed mechanism, it
is
necessary
to
either remove
the
gear motor, or, alternatively,
to
rotate
gear by using a ratchet wrench
with
13/16 inch 12-point
socket
to
rotatethemotor pinion justenough
to
freethejam.
The springs will discharge and
the
breaker closes
when
the gear motorpinion
is
disengaged from
the
gear.
Use
the
manual charging mechanism or
the
maintenance
closing device
to
prevent this from happening.
Move
the
manual handle
towards
the
charge position, applying
force
to
the
closing springs, and
allow
the
ratchet on
charging cam
to
support load while
the
motor
is
removed.
This prevents the closing springs from discharging when
the
motor is removed.
Courtesy of NationalSwitchgear.com
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