Siemens GMI Series

Installation
Checks
and
Initial
Functional
Tests
Introduction
This
section
provides
a
description
of
the
inspections
,
checks
and
tests
to
be
performed
on
the
circuit
breaker
prior
to
operation
in
the
metal
-
clad
switchgear
.
ADANGER
h
Hazardous
voltages
and
high
-
speed
mechanical
parts
.
Will
cause
death
,
severe
personal
injury
,
or
property
damage
.
Read
instruction
manuals
,
observe
safety
instructions
and
use
qualified
personnel
.
Inspections
,
Checks
and
Tests
without
Control
Power
Vacuum
circuit
breakers
are
normally
shipped
with
their
pri
-
mary
contacts
open
and
their
springs
discharged
.
However
,
it
is
critical
to
f
/
rsfverify
the
discharged
condition
of
the
spring
-
loaded
mechanisms
after
de
-
energizing
control
power
.
De
-
Energizing
Control
Power
in
Switchgear
-
When
the
circuit
breaker
is
mounted
in
switchgear
,
open
the
control
power
disconnect
device
in
the
metal
-
clad
switchgear
cubicle
.
Figure
1
shows
the
location
of
this
disconnect
in
a
standard
GM
switchgear
assembly
.
The
control
power
disconnect
device
is
located
on
the
device
panel
above
the
lower
circuit
breaker
and
below
the
upper
circuit
breaker
.
Figure
1
shows
a
pullout
type
fuse
holder
.
Removal
of
the
fuse
holder
de
-
energizes
control
power
to
the
circuit
breaker
in
the
respective
switchgear
cell
.
In
some
switchgear
assemblies
,
a
molded
case
circuit
breaker
is
used
in
lieu
of
the
pull
out
type
fuse
holder
.
Opening
this
circuit
breaker
accomplishes
the
same
result
:
control
power
is
dis
-
connected
.
Spring
Discharge
Check
(
Figure
2
)
-
Perform
the
Spring
Discharge
Check
before
removing
the
circuit
breaker
from
the
pallet
or
removing
it
from
the
switchgear
.
The
spring
discharge
check
consists
of
simply
performing
the
following
tasks
in
the
order
given
.
This
check
assures
that
both
the
tripping
and
closing
springs
are
fully
discharged
.
1
.
Press
red
Trip
pushbutton
.
2
.
Press
black
Close
pushbutton
.
3
.
Again
press
red
Trip
pushbutton
.
4
.
Verify
Spring
Condition
Indicator
shows
DISCHARGED
.
5
.
Verify
Main
Contact
Status
Indicator
shows
OPEN
.
Removal
from
Lower
Cell
in
Indoor
(
if
not
on
raised
pad
)
and
Shelter
-
Clad
Outdoor
Switchgear
-
After
performing
the
Spring
Discharge
Check
(
with
control
power
de
-
energized
)
,
remove
the
circuit
breaker
from
its
switchgear
cubicle
.
1
.
Insert
the
racking
crank
on
the
racking
screw
on
the
front
of
the
breaker
cell
,
and
push
in
.
This
action
operates
the
racking
interlock
latch
.
Figure
3
shows
racking
of
a
circuit
breaker
in
the
upper
cell
-
the
process
is
similar
for
a
breaker
in
the
lower
cell
.
2
.
Rotate
the
racking
crank
counterclockwise
until
the
breaker
is
in
the
Disconnect
position
.
If
the
racking
crank
is
not
of
the
"
Captive
"
type
,
constant
inward
pressure
is
required
during
racking
to
maintain
engagement
with
the
racking
mecha
-
nism
.
3
.
Move
the
breaker
release
latch
to
the
left
and
pull
the
circuit
breaker
out
from
the
Disconnect
position
.
The
breaker
can
now
be
removed
from
cubicle
.
Figure
1
:
Control
Power
Disconnects
in
Switchgear
.
Figure
2
:
Front
Panel
of
GMI
Circuit
Breaker
.
4
Courtesy of NationalSwitchgear.com