Siemens GMI Series

Interrupter
/
Operator
Description
Page
11
ing
springs
are
attached
to
the
crank
arms
,
and
are ex
-
tended
during
the
charging cycle
.
Figure
17
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
electri
-
cally
,
the
motor
eccentric
(
100
)
introduces
a
rocking
motion
into the drive
plate
(
13
)
.
As this
plate
rocks back and
forth
,
the lower
pawl
(
24
-
1
)
(
which is
connected
to
the
drive
plate
)
imparts
counterclockwise 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
pumping
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
charg
-
ing
link
(
48
)
.
The
upper
pawl
(
24
-
2
)
drives
the
ratchet
plate
counterclockwise
during
manual
charging
,
and the
lower
pawl
(
24
-
1
)
becomes the
holding
device
.
At
the
beginning
of
the
charging
cycle
,
ratchet
pin
(
16
)
is
at
the
6
o
’
clock
position
.
The
ratchet
pin
is
connected
to
the
ratchet wheel
.
Upon
reaching
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
reaches 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
)
.
The
closing springs
are
restrained
fully
charged by
close hatchet
(
22
)
against
close
shaft
(
72
)
.
Closing
Mode
(
Figure
18
)
Energizing
the
close
solenoid
(
265
)
pulls
the
solenoid
arma
-
ture
against
the
closing
shaft
actuator
(
75
)
and
causes
the
close
shaft
(
72
)
to rotate
approximately
15
°
.
If
the
closing
spring
are
charged
,
the close hatchet
(
22
)
will
be released
by
this rotation
allowing
the main
cam
shaft
(
3
)
to
be driven
by
the
closing springs
.
Depressing
the manual close button
on
the
operator
panel
causes
the rotation
of
the close
shaft
(
72
)
by
the
lower
end
of
the close
shaft
actuator
(
75
)
.
Rotation
of
the
main
cam
shaft
(
3
)
in
a
manual
closing
operation
is
identical
to
that
of
an
electrical
closing
opera
-
tion
.
As
the
main
cam
shaft
(
3
)
rotates
,
the
cam
follower
(
115
)
is driven
by
drive
cam
(
20
)
,
and the
main
link
(
120
)
is
forced
outwards
,
and rotation
of
the
jack
shaft
assembly
(
217
)
occurs
.
There
are
three drive links
attached
to
Point
‘
A
’
of
Close
Solenoid
©
Motor
Cutoff
Spnng
Charged
Switches
(
LS
1
/
LS
2
)
265
258
Close
Shaft
Actuator
Charged
.
Spring
©
75
Flag
132
Close
Shaft
72
Main
Cam
Spring
Condition
Indicator
Cam
20
Manual
Close
Actuator
(
153
)
Jack
Shaft
18
Main
Cam
Shaft
3
Jack
Shaft
Main
Cam
Follower
Plate
217
-
3
I
115
ft
n
Figure
18
.
Closing
Mode
.
each
of
the three
jack
shaft
drive
plates
.
Each drive
link
is
connected
to
the
movable
contact
of
one
vacuum
interrup
-
ter
.
Closing
rotation
(
counterclockwise
)
of
the
jack
shaft
assembly
closes the
contacts
of
the three
vacuum
interrup
-
ters
.
During closing
operation
,
rotation
of
jack
shaft
assemb
-
ly
(
217
)
forces
the
opening
(
i
.
e
.
,
tripping
)
spring
into its
charged
position
.
Trip
Free Mode
If
at
any
time
during
breaker
closing
,
the
trip
shaft
(
79
)
,
see
Figure
15
,
operates
as a
result
of
either
an
electrical
or
mechanical
trip
,
trip
hatchet
(
99
)
is
free
to rotate
.
When the
trip
hatchet
(
99
)
rotates
,
cam
follower
(
115
)
is
displaced
by
drive
cam
(
20
)
without
motion
of
the
jack
shaft
(
217
)
.
Mechanical
trip
free
operation
is
provided
by
manual
trip
-
ping
,
electrical
tripping
and
/
or
the mechanical interlocks
.
Opening
Mode
Opening
or
tripping
the
vacuum
interrupter
contacts
is
accomplished
by
rotation
of
the
trip
shaft
(
79
)
.
Rotation
may
be
produced
either
electrically
,
by energizing
the
trip
so
-
lenoid
(
266
)
,
see
Figure
16
,
or
manually
by pressing
the
trip
button
.
Energizing
the
trip
solenoid
causes
the
upper
arm
of
the
trip
actuator
(
152
)
to rotate
counterclockwise
.
Press
-
ing
the
trip
button
causes
the
trip
actuator
lower
arm
to
move
,
again producing
rotation
of
the
trip
shaft
.
All
of
the
linkages
are
trip
free
,
and
tripping
or
opening
is
unaffected
I
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