Siemens GMI Series

Interrupter
/
Operator
Description
!
©
TRIP
—
-
SOLENOID
©
TRIP
—
.
SOLENOID
TRIP
SOLENOID
ARMATURE
CrP
266
TRIP
SOLENOID
ARMATURE
266
3
BANANA
BANANA
LINK
LINK
o
113
113
T
DRIVE
CAM
'
TRIP
ACTUATOR
TRIP
ACTUATOR
20
C
DRIVE
i
152
O
152
CAM
o
o
20
o
•
L
-
LATCH
FACE
CLOSE
-
HATCHET
-
f ?
i
'
(
r
TRIP
SHAFT
n
TRIP
SHAFT
CAM
—
FOLLOWER
79
/
CAM
79
©
v
;
FOLLOWER
ROLLER
/
115
115
-
TRIP
HATCHET
\
o
-
TRIP
HATCHET
99
A
O
©
99
JACK
SHAFT
MAIN
o
:
JACK
SHAFT
MAIN
LINK
LINK
217
120
120
217
POINT
"
A
"
POINT
"
A
"
o
©
JACK
SHAFT
PLATE
O
JACK
SHAFT
PLATE
nju
Figure
15
a
:
Breaker
Open
—
Closing Springs Charged
.
Figure
14
a
:
Breaker
Open
—
Closing
Springs
Discharged
.
Figure
16
a
shows
the
ratchet wheel
(
15
)
which
is
free
to
rotate
about
the main
cam
shaft
(
3
)
.
The ratchet
wheel is
driven
by
either
the
charging
motor
or
the manual
charge
handle
socket
(
52
)
.
When the
springs
are
charged electrically
,
the
motor
eccentric
(
100
)
introduces
a
rocking
motion
into the
drive
plate
(
13
)
.
As this
piate
rocks
back and
forth
,
the lower
pawl
(
24
-
1
)
(
which is connected
to
the drive
plate
)
imparts
counterclock
-
wise
rotation
of
the ratchet
wheel
(
15
)
,
one
tooth
at
a
time
.
The
upper
pawl
(
24
-
2
)
acts
as a
holding
pawl
during
electrical
charging
.
When the
springs
are
charged
manually
,
up
and down
pump
-
ing
action
of
the
spring
charging
handle
in
the manual
charge
handle socket
(
52
)
causes
the
pawl plate
(
11
)
to
rock
back and
forth
through
the
movement
of
the manual
charging
link
(
48
)
.
The
upper
pawl
(
24
-
2
)
drives the
ratchet
plate
counterclock
-
wise
during
manual
charging
,
and
the lower
pawl
(
24
-
1
)
becomes
the
holding
device
.
At
the
beginning
of
thecharging
cycle
,
ratchet
pin
(
16
)
is atthe
6
o
'
clock
position
.
The
ratchet
pin
is connected
to
the ratchet
wheel
.
Upon
being
advanced
by
ratchet
action
to
the
12
o
'
clock
position
,
this
pin
engages
the
drive
arms
(
8
)
which
are
keyed
to
the main
cam
shaft
.
Consequently
,
counterclockwise
rotation
of
the
ratchet wheel
causes
the
ratchet
pin
to
drive the
main
cam
shaft
counterclockwise
,
When
the
ratchet
pin
reacnes
the
6
o
'
clock
position
,
the
closing springs
are
fully
charged
.
Driving
pawl
(
24
-
1
)
is
disengaged
,
the
spring
condition indicator
cam
(
18
)
has
rotated
allowing
the
spring
charged
flag
(
132
)
to
drop
into
the lower
(
charged
)
position
,
which
also
operates
the
motor
cutoff
switch
(
LS
1
)
and
spring
charged
switch
(
LS
2
)
(
258
) (
see
Figures
17
a
and
27
)
.
The
closing springs
are
restrained
fully
charged
by
close
hatchet
(
22
)
against
close
shaft
(
72
)
.
Modes
of
Operation
-
Mid
-
1991
and
After
Pages
10
-
11
describe
the
operation
of
the mechanism used
beginning
in
approximately
mid
-
1991
.
This
mechanism
can
be
identified
by
observing
the
close latch
above the
spring charging
motor
on
the
left
side
of
the circuit
breaker
.
Refer
to
Figure
18
a
.
The
close
latch
is
installed
on
the close
shaft
assembly
72
,
and includes
a
hardened latch
face
.
This
face
contacts
a
bearing
which is
part
of
the close
hatchet
assembly
105
.
If
the
mechanism
has
a
close hatchet
which bears
directly
on
the
close
shaft
,
referto
pages
12
-
13
for
the
description
of
your
mechanism
.
Modes
of
Operation
-
Discussion
Some
maintenance
procedures
are more
easily
understood
when the
operating
mechanism modes
of
operation
are
de
-
scribed
in
detail
.
The
next
few
paragraphs
explain
the
five
modes
or
status
conditions
(
charging
,
closing
,
trip
-
free
,
open
-
ing
and
rapid
auto
-
reclosing
)
of
the
stored
energy
operating
mechanism
.
Note
:
All
discussion
of
modes
of
operation
assumes
that the
reader
is
viewing
the
operator
from
the
front
,
or
from
the
right
hand side
.
Spring Charging
Mode
-
Figures
14
a
and
15
a
show several
key
components
of
the
operator
mechanism
in
positions
cor
-
responding
to
the breaker
open
,
with
the
closing springs
discharged
(
Figure
14
a
)
and
charged
(
Figure
15
a
)
.
Figure
16
a
shows
portions
of
the
operator
mechanism that
manually
or
electrically charge
the
closing springs
.
The drive
cam
(
20
)
,
the
closing spring
crank
arms
(
Figure
19
)
and
spring
condition
indicator
cam
(
18
)
are
directly keyed
to
the main
cam
shaft
(
3
)
.
The main
cam
shaft
rotates
counterclockwise
.
The
closing
springs
are
attached
to
the
crank
arms
,
and
are
extended
during
the
charging
cycle
.
10
Courtesy of NationalSwitchgear.com