GE AK-50 - Bell Alarm;Lockout Device for AK-2 Series and Dynamic Brake; Bell Alarm;Lockout Device for AK-2 Series; AK-2 Bell Alarm;Lockout Device Adjustments; Dynamic Brake for Electrical Breakers

Low
-
voltage
Power
Circuit
Breakers
Gil
-
74600
gaged
by
the shunt
trip
armature
lever
(
8
)
when
the shunt
trip
device
is
op
-
erated
.
This defeats
the
device
when
the
shunt
trip
device
operates
.
The
latch release
strap
(
7
)
,
which is
a
part
of
the
device
latch
(
4
)
,
must
be formed
to
hook
around
the
shunt
trip
armature
lever
(
8
)
in
a
manner
that
will
assure
the
device
latch
and
catch
are
disen
-
gaged
before the
breaker
opens
.
2
OC
f
'
J
•
J
3
16
ir
x
4
15
5
/
14
r
6
1
.
Crossbar
Side
-
li nk Pi n
2
.
Operating
Link
3
.
Lockout
Adjusting
Screw
4
.
Device
Latch
5
.
Lockout
Trip
Paddle
6
.
Trip
Shaft
7
.
Latch
Release
Strap
8
.
Shunt
Trip
Ar mature
Lever
9
.
Shunt
Trip
Ar mature
10
.
Shunt
Trip
Device
11
.
Bell
Alarm
Plunger
12
.
Device
Adjusting
Screw
13
.
Operating
Arm
14
.
Manual
Trip
Rod
15
.
Catch
16
.
Trip
-
rod
Release
Collar
IK
t
.
J
8
i
/
9
JO
!
3
II
12
Fig
.
33
.
8
e
//
alarm
and
lockout
device
—
AK
-
l
-
50
-
(
8
and
above
)
,
AK
-
2
-
50
,
AK
-
2
-
75
and
AK
-
2
-
100
DYNAMIC
BRAKE
FOR
ELECTRICAL
BREAKERS
(
Fig
*
34
)
When
the
application
requires
less
closing
time
than
the
60
-
to
90
-
cycle
closing
time
provided
by
the
stan
-
dard
electrically
operated
breaker
,
a
mechanism
equipped
with
a
dynamic
brake
is
used
.
This section
applies
to
the
dynamic
brake
feature
only
and
modifies
the
description
of
operation
shown
in
the basic instructions
for
the
breakers
.
Figure
34
A
shows
a
typical
ele
-
mentary
diagram
of
a
breaker
equipped
with
a
dynamic
brake
.
The circuit is
shown
with
the
breaker
open
and the
springs
fully
discharged
.
The
con
-
ducting
portion
of
the circuit is
shown
solid
while the
non
-
conducting
com
-
ponents
(
during
the
pre
-
charge
opera
-
tion
)
are
shown
dotted
.
With
voltage
applied
across
+
(
X
)
and
-
(
Y
)
,
the
cir
-
cuit
from
+
(
X
)
is
completed
through
control switch
F
3
-
4
,
control switch
G
3
-
4
,
motor
field
R
1
-
2
,
control
re
-
lay
contact
K
8
-
4
,
control switch
3
-
4
motor
armature
3
-
4
to
-
(
Y
)
.
With
the
motor
energized
,
the
springs
are
charged
to
the
end
of
the
pre
-
charged
position
.
At
the
end
of
the
pre
-
charge
operation
,
control switches
E
,
F
,
and
G
reverse
their
contacts
and the
cir
-
cuit
assumes
the
position
of
Fig
.
34
B
.
When
a
closing
operation
is
desired
,
the
remote
closing
button
is
closed
to
energize
the
K
relay
and the
circuit
as
-
sumes
the
conducting
circuit
shown
by
the solid circuit
in
Fig
.
34
C
.
The
cir
-
cuit
from
+
(
X
)
is
through
K
1
-
7
,
R
1
-
2
,
K
8
-
2
,
F
1
-
2
,
R
3
-
4
to
-
(
Y
)
.
The
polarity
of
the
field with
respect
to
the
armature
is
such
that
the
motor
will
run
in
the
forward
direction
(
same
as
in
pre
-
charge
operation
Fig
.
34
A
)
.
After
the
motor
completes
the
spring charg
-
ing
operation
,
the
springs
are
released
to
close the
breaker
.
Although
the
cir
-
cuit
through
the
"
Remote
Close
"
switch
is
shown closed
in
Fig
.
34
C
,
it
is
not
necessary
that
the
"
Remote
Close
"
switch
be
maintained closed
because
the
K
relay
is
sealed
closed
through
the
resistor
N
,
G
1
-
2
,
relay
K
7
-
1
to
+
(
X
)
until the breaker closes
.
ADJUSTMENTS
Control
switches
E
,
F
,
and
Gshould
be
adjusted
so
that
at
the
end
of
the
pre
-
charge
operation
F
toggles
first
,
fol
-
lowed
immediately
byG and
then
by
E
.
The switches
should be
adjusted
on
their
mounting
so
that
the
overtravel
button
has
no
more
than
1
/
16
-
in
.
movement
.
Excessive
overtravel
of
the overtravel
button will
damage
the switch
.
Functionally
,
the
dynamic
brake
control scheme differs
from
the
stan
-
dard
control
scheme
in
that
the
pre
-
charge
operation
is
extended
to
charge
the
closing
springs
more
fully
.
At
the
end
of
the
pre
-
charge
operation
,
the
dynamic
brake
is
applied
to
prevent
the
charging
mechanism
coasting
to
an
overcenter
position
and
allowing
dis
-
charge
of
the
closing
springs
.
With
the
closing
springs
being
more
fully
charged
in
the
pre
-
charged
position
,
less time is
required
to
complete
the
final
spring
charging
when
a
closing
operation
is
desired
.
The
closing
time
for
breakers
equipped
with
dy
-
namic breaker mechanisms is
ap
-
proximately
30
cycles
.
c
In
Fig
.
34
B
,
the
motor
control
cir
-
cuit
has
been
isolated
from
the
source
voltage
by
the
opening
of
control
switches
F
3
-
4
and
G
3
-
4
.
A
residual
current
circulates
through
the
motor
in
such
direction
that
the field
is
re
-
versed
with
respect
to
the
armature
.
This
reversal
of
the
field
with
respect
to
the
motor
brings
the
motor
to
a
very
sudden
stop
.
Courtesy of NationalSwitchgear.com