GE Magne-Blast AM-13.8-1000-3H - Spring Charging Mechanism; Closing Operation Sequence; Opening Operation Sequence

GEI
-
88766
Spring
Charging
«
r
The
mechanism
consists
of
a
high
speed
gear
motor
that
compresses
a
set
of
closing
springs
through
the
action
of
a
simple
eccentric
*
ratchet
*
and
pawl
assembly
.
The
rotary
action
of
the
motor
(
2
)
Fig
.
4
is
con
-
verted
to
a
short
straight
stroke
pumping
action
through
the
eccentric
(
6
)
and
a
lever
that
carries
a
spring
loaded
driving
pawl
(
5
)
.
The
pawl
advances
the
ratchet
wheel
(
3
)
Fig
.
3
only
a
few
degrees
each
stroke
where
it
is
held
in
position
by
the
latching
pawls
(
l
)
ratchet
wheel
has
been
rotated
approximately
l
80
degrees
the
closing
springs
(
6
)
will
be
fully
compressed
.
As
the
ratchet
wheel
continues
to
rotate
*
the
spring
load
will
shift
over
center
and
attempt
to
discharge
.
After
only
a
few
degrees
of
rotation
*
the
closing
roller
(
10
)
Fig
.
1
will
engage
the
closing
latch
(
ll
)
and
the
compressed
springs
will
be
held
in
repose
until
a
closing
operation
is
required
.
During
the
last
few
degrees
of
the
ratchet
wheel
rotation
the
motor
and
interlock
switch
-
es
(
6
)
are
released
and
the
driving
pawl
is
raised
from
the
ratchet
wheel
surface
.
This
allows
the
motor
and
driving
mechanism
to
coast
to
a
natural
stop
expending
all
residual
energy
.
During
the
time
the
springs
are
being
compressed
a
relay
(
6
)
Fig
,
o
locks
the
closing
power
circuits
open
and
the
relay
will
remain
energized
un
-
til
the
springs
are
fully
charged
and
the
control
contacts
are
re
-
set
.
The
closing
springs
may
be
charged
manually
if
control
voltage
is
lost
.
A
p
/
8
'
f
ratcnet
wrench
can
be
used
to
rotate
tne
eccentric
in
a
counter
clockwise
direction
until
the
indicator
reads
’
’
CHARGED
1
'
and
the
driving
pawl
no
longer
engages
the
ratchet
wheel
.
The
use
of
the
ratchet
wrench
provides
for
maximum
safety
in
the
event
that
control
power
is
suddenly
restored
without
warning
.
In
this
event
*
the
motor
drive
will
take
over
again
and
continues
to
charge
the
springs
.
When
the
m
W
Closing
Operation
Closing
the
breaker
Is
accomplished
by
energizing
the
closing
solenoid
or
by
manually
pressing
the
close
button
latch
is
removed
from
the
spring
blocking
location
allowing
the
springs
to
discharge
,
The
energy
of
the
springs
is
applied
to
the
rotation
of
a
cam
(
l
6
)
Fig
.
5
that
closes
the
breaker
through
a
simple
linkage
that
remains
trip
free
at
all
times
.
A
monitoring
switch
(
ll
)
Fig
.
6
on
the
closing
latch
will
start
the
spring
charging
motor
after
it
is
fully
reset
.
In
either
case
*
the
closing
mm
Ip
Opening
Operation
An
electrical
opening
operation
is
initiated
by
energising
the
trip
coil
.
This
is
accomplished
either
by
actuating
the
opening
cohtrol
switch
on
the
metal
-
clad
unit
or
by
a
combination
of
relays
and
current
devices
used
to
detect
.
a
fault
on
the
load
side
of
the
breaker
.
By
energizing
the
trip
coil
*
the
trip
plunger
rotates
the
trip
latch
{
7
)
s
Fig
.
5
caus
-
ing
the
operating
mechanism
,
linkage
to
collapse
The
energy
stored
in
m
D
Courtesy of NationalSwitchgear.com