Allis-Chalmers BWX-6637-5, Instruction Book

Page: 19 / 88

L
2. Breaker The
me
c
h
a
n i s
m
of
t
h e
electrlcallv-opeqtted
breaker
Is
the
�arne as that of
th
e manua
I I y
-
o
p
e
r
·.a
t
e d
breaker except
that
the
manual c
l
o s
i
ng
handle 15 r
e p l
a
c
e
d
by an e
le c
t
ri c
motor and
the gear
s
y
s
t
e
m
.
Refer
to
F
ig
u
r
e
s
2A
and 3.
M ov
e
m
e
nt of
t
h e
control switch
(N) located
on the front of the
breaker
t
o
the 110N11 p
os
I
t I o n
,
when the
con
t
ro
1
c
i r
c
u i t
Is e
n
e
rgi
z
e
d
,
will start the automatic
c
l
os
i
n g
cycle. Motor gear box
p
i
n
i o
n
(238) rotates gear (235) counterclockwise,
e
n d pins (236)
m
o v
e
across
the top of flat biasing sp�fng (234). This raises
t
o
g
g
l
e
tinkage
(237) over center
and positions gear (235) to mesh with gear segment
(240).
Since
this gear segment Is
a
t
t
a
c h e d
to
c
l
o s in g cam (210), the
stored-energy springs are charged and latched in :the
same sequence as
described In the previous
s
e c
t
i
o
n
.
The lower e
x
�
e
n
s
i
o
n
of
c
l
o
s
i n
g cam
(2 1 0)
e
n
g
a
g e
s
a
r o
l
l e
r on toggle linkage (237)
to
disengage
g
e
a r
(
235
)
from gear
se
g m e
n
t
(2LW) after the stored-energy �
p
r
i n gs are l
a
t
c
h
e
d in
t
h e
charged position by spring-release latch
(
20
2
) .
1
Spring-position
s
w
i
t
c
h (230) (SPS b) is actuated.to the
opere position
by
arm (231)
a
tt
a
c
h
e
d
to link
(225)
as
t h
e
stored·e�ergy springs
approach
the
c
h
a
rg
e
d position. This switch I n
i
t i a
t e
s
the 'spring
recharging
cyciL
and Is connected
in parallel
wi
th motor cut-off �witch (232)
(88a) which
is
open I
n
it i a
l
l
y
,
closes while
t
h e motor charges the
springs,
and
opens
when the springs
are
c h
a
rg e d
with the
g
e
a r
i
n g
disengaged.
The
motor cut­
off switch
is
actuated by the movement of
plunger
(
23 3 ) over pins (236).
A
p
p
r
o
x
i
ma
t
e
l
y
twelve seconds are required for
completion
of
the spring
charging cycle.
The
b
re
a
k
e r
may now be
closed by pushing down spring-release latch hood
(202A)
as
In the
manually-operated
breaker, or It
may be cl
o
s
e
d electri­
cally through remote close control switch
(
CSC
)
.
1
T
h
i s
switch energizes
spring-rel�ase
c o
i
l
(
SRC
)
which moves
p
i
n (241) ln·a counterclockwise
d i
rec
t i
o n to
tr"lp
s
p
r
i
n
g
release latch hood (202A)
and sp
r
i
n
g
-
r
e
le
a
s e
latch (202). The 11Y11 coli I s energized
s
i
m
u
l
t
a
n
e
o
u
s l
y
with the spring­
release col I a n
d causes
the
1�11
contact
t
o
open the circuit to th�
motor.
Since
the ''Y11
relay
w
i
l
l
remain energized as
long
as
the
re
mot
e
close
control switch
(
CSC
)
is
held
c
l
o
s
e
d
,
11Yl11 c o
n t
a
c
t keeps
the
motor
c
i r c ui t
open to
p
r
e v
e
n
t
11pumpi ng11
or
repeated a t
t
em
p ts to;
c
h a r g
e
the stared­
e
n
e
r
gy $prings when the breaker is closing.
After
t
h
e
stored-energy springs a r e
discharged,
t
h e
y
are au t omat
i
c ally
recharged
as
long
as the
control
circuit
is
e n e
r
g
i z
e
d,
and t
h e cont rol
switch
(N) Is
In the 110N11
p
o
si
t i o n
.
Figure
3 shows the
spring-position
switch
(SPSI·b}
c
lased
to
complete
the
motor
c
o n
tr
p
l
ci rcul t
as It w
o
u
l d
be when the springs arc di
sc
h
a
r
ge d.
TABLE
2
Charging Springs:
Closing:
OR
T
ri
p
p
i
n
g
:
--
OR
OPERATING PROCEDURE
ELECTRICALLY-OPERATEO BREAKERS
Energize control c
i
rcu
i
t
.
Hove
cpntrol switch (N) on
front of
breaker
to "ON" position�
After springs are
charged, actuat� remote c lo s
e c
o
n
t
ro
l
switch (esc).
.
I
Push down spring-release latch ho9d (202A).
I
I
Actuate remote trip control
switch (CST).
Push in
manual
trip
r
o d
(207). I
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