Siemens GMI Series

Maintenance
Figure
32
shows
the
breaker
spring
condition
indicator
in
the
Discharged
position
.
5
.
Remove
the
breaker
from
the
switchgear
.
Refer
to
the
preceding
installation
section
of
this
manual
for
special
instructions
and
precautions
regarding
removal
of
the
upper
breaker
.
6
.
The
breaker
can
be
located
either
on
the
floor
or
on
a
pallet
.
Each
breaker
has
four
wheels
and
handles
to
allow
one
person
to
maneuver
the
unit
on
a
level
surface
without
assistance
.
Checks
of
the
Primary
Power
Path
The
primary
power
path
consists
of
the
three
vacuum
interrupt
-
ers
,
the
three
upper
and
the
three
lower
primary
disconnects
.
These
components
are
checked
for
cleanliness
and
condition
.
The
vacuum
interrupters
are
also
checked
for
vacuum
integrity
.
Some
test
engineers
prefer
to
perform
the
contact
erosion
check
during
the
manual
spring
charging
check
of
the
opera
-
tor
,
since
charging
of
the
springs
is
necessary
to
place
the
contacts
in
the
closed
position
.
Also
,
the
vacuum
integrity
check
is
usually
performed
in
conjunction
with
the
High
Potential
tests
.
These
instructions
follow
the
recommendation
that
these
tests
(
contact
erosion
/
manual
spring
charging
check
,
and
vacuum
integrity
/
high
potential
tests
)
will
be
combined
as
described
.
Cleanliness
Check
-
Figure
33
is
a
side
view
of
the
GMI
circuit
breaker
with
the
outer
insulating
barriers
removed
to
show
the
vacuum
interrupter
,
and
the
upper
and
lower
primary
discon
-
nects
.
All
of
these
components
must
be
cleaned
and
free
of
dirt
or
any
foreign
objects
.
Use
a
dry
lint
-
free
cloth
.
For
stubborn
dirt
,
use
a
clean
cloth
saturated
with
denatured
alcohol
.
Inspection
of
Primary
Disconnects
-
Figure
34
shows
the
primary
disconnect
contact
fingers
engaged
.
When
the
con
-
tacts
are
mated
with
the
switchgear
'
s
primary
stud
assembly
,
there
is
forceful
contact
distributed
over
a
wide
area
.
This
maintains
low
current
flow
per
individual
contact
finger
.
Inspect
the
contact
fingers
for
any
evidence
of
burning
or
pitting
that
would
indicate
weakness
of
the
contact
finger
springs
.
Inspect
the
primary
disconnect
arms
for
physical
integrity
and
absence
of
mechanical
damage
.
Inspect
the
flexible
connectors
that
connect
the
bottom
movable
contacts
of
the
vacuum
interrupters
to
the
lower
primary
discon
-
nect
arms
for
tightness
and
absence
of
mechanical
damage
,
burning
,
or
pitting
.
Using
a
clean
cloth
saturated
with
denatured
alcohol
,
clean
old
lubricant
from
primary
disconnects
,
and
apply
Siemens
con
-
tact
lubricant
(
reference
15
-
171
-
370
-
002
)
in
a
very
thin
layer
.
1
.
The
first
step
is
to
de
-
energize
the
circuit
breaker
.
Figure
32
illustrates
the
location
of
the
trip
control
on
the
circuit
breaker
operator
panel
.
Depressing
the
Trip
pushbutton
opens
the
breaker
prior
to
removal
from
the
switchgear
.
2
.
The
second
step
in
the
removal
procedure
is
to
de
-
energize
control
power
to
the
circuit
breaker
.
Open
the
control
power
disconnect
device
mounted
above
the
lower
breaker
or
below
the
upper
breaker
.
Review
Figure
1
.
3
.
Rack
the
breaker
to
the
Disconnect
position
.
4
.
Perform
the
spring
discharge
check
.
This
is
done
by
first
depressing
the
red
Trip
pushbutton
.
Second
,
depress
the
black
Close
pushbutton
.
Third
,
depress
the
red
Trip
push
-
button
again
,
and
observe
the
spring
condition
indicator
.
It
should
read
Discharged
.
21648
-
93
Figure
32
:
Manual
Tripping
of
Circuit
Breaker
.
Figure
33
:
GMI
Breaker
Showing
Vacuum
Interrupters
and
Primary
Disconnects
Figure
34
:
Primary
Disconnect
in
Mated
Position
.
22
Courtesy of NationalSwitchgear.com