Siemens GMI Series

Interrupter
/
Operator
Description
Page
16
Figure
29
.
Optional
TOC
Switch
.
Figure
28
.
Mating
Pantograph
Linkage
for
MOC
.
These
are
:
1
)
automatic
charging
of
the
closing
springs
;
2
)
electrical
closing
of
the
primary
contacts
and
3
)
electrical
tripping
of
the
primary
contacts
.
Automatic
spring
charging
by
charging
motor
88
occurs
when
secondary
control
power
is
available
,
and
motor
cutoff
switch
LS
1
has
not
operated
.
The
springs
are
automatically
recharged
after
each
closing
operation
.
Electrical
closing
occurs
with
closing
control
power
applied
and
when
all
of
the
following
conditions
exist
:
1
)
External
control
switch
01
/
C
is
closed
;
2
)
Anti
-
pump
relay
52
Y
is
not
energized
;
3
)
Auxiliary
switch
52
b
indicates
the
breaker
is
in
open
position
;
4
)
Limit
switch
LS
3
shows
that
the
trip
latch
has
been
reset
;
5
)
Limit
switch
LS
2
indicates
that
the
closing
springs
are
charged
;
and
6
)
Limit
switch
LS
4
indicates
the
breaker
is
in
the
Test
position
or
the
Connected
position
,
or
is
out
of
the
compartment
.
Electrical
tripping
occurs
with
tripping
control
power
applied
and
when
the
auxiliary
switch
52
a
shows
the
breaker
is
closed
,
and
a
trip
signal
is
provided
by
the
control
switch
01
fT
or
the
protective
relays
.
While
external
control
power
is
required
for
either
electrical
closing
or
tripping
;
the
circuit
breaker
can
be
manually
charged
,
closed
and
tripped
without
external
control
power
.
Figure
32
is
a
standard
wiring
diagram
of
the
circuit
breaker
operating
from
dc
control
power
.
All
of
the
device
symbols
are
the
same
as
shown
in
the
schematic
diagram
.
Limit
Switches
(
Figure
30
)
The
motor
cutoff
switch
(
LS
1
)
is
used
to
sense
the
position
of
the
driven
mechanisms
.
This
switch
de
-
energizes
the
charging
motor
when
the
Charged
position
of
the
closing
springs
is
reached
.
When
the
closing
springs
are
dis
-
charged
,
this
switch
energizes
the
control
circuit
powering
the
spring
charging
motor
.
Spring
charged
switch
(
LS
2
)
operates
simultaneously
with
motor
cutoff
switch
(
LS
1
)
.
The
spring
charged
switch
allows
the
close
solenoid
to
be
energized
only
when
the
springs
are
charged
,
and
also
is
part
of
the
antipump
circuitry
.
The
trip
latch
check
switch
(
LS
3
)
operates
when
the
trip
latch
linkage
is
in
the
reset
position
.
The
racking
position
switch
(
LS
4
)
is
driven
by
operating
bars
that
sense
when
the
breaker
is
in
either
the
Test
or
Con
-
nected
position
inside
the
switchgear
.
Control
circuitry
prevents
an
electrical
release
of
the
closing
springs
unless
the
breaker
is
either
in
the
Test
or
Connected
position
.
Standard
Schematic
and
Wiring
Diagrams
i
Inspection
of
the
schematic
diagram
shown
in
Figure
31
provides
a
clear
picture
of
the
logic
states
of
the
various
devices
for
the
three
basic
control
functions
.
Courtesy of NationalSwitchgear.com