Siemens 5-GMI-350 - Page 30

Maintenance
&
Overhaul
Page
27
factory
operation
of
auxiliary
switches
,
internal
relays
and
solenoids
.
Checks
of
the
Spring
Charging
Motor
No
additional
checks
of
the
spring
charging
motor
are
necessary
.
Once
every
10
,
000
operations
,
the
motor
brushes
need
replacement
.
Use
the
operation
counter
as
the
basis
for
establishing
the
operation
frequency
.
NOTE
A
temporary
source
of
control
power
and
test
leads
may
be
required
if
the
control
power
source
has
not
been
connected
to
the
switchgear
.
When
con
-
trol
power
is
connected
to
the
GMI
circuit
breaker
,
the
closing
springs
should
automatically
charge
.
High
-
Potential
Tests
Electrical
Close
and
Trip
Check
—
Control
Power
Required
A
check
of
the
breaker
control
circuits
is
performed
while
the
unit
is
still
connected
to
the
'
switchgear
by
the
plug
jumper
.
This
check
is
made
with
the
breaker
energized
by
control
power
from
the
switchgear
.
1
.
Once
the
breaker
springs
are
charged
,
move
the
switchgear
Close
/
Trip
switch
to
the
Close
position
.
There
should
be
both
the
sound
of
the
breaker
closing
and
indication
that
the
breaker
contacts
are
closed
by
the
main
contact
status
indicator
.
2
.
As
soon
as
the
breaker
has
tripped
,
the
automatic
spring
charging
process
is
repeated
.
3
.
After
a
satisfactory
close
operation
is
verified
,
move
the
switchgear
Close
/
Trip
switch
to
the
Trip
position
.
Verify
by
both
sound
and
contact
position
that
the
contacts
are
open
.
Completion
of
these
checks
demonstrates
satis
-
The
next
series
of
tests
involve
use
of
high
voltage
test
equipment
.
The
breaker
under
test
should
be
inside
a
suitable
test
barrier
equipped
with
warning
lights
.
Electrical
Vacuum
Integrity
Check
A
high
potential
test
is
used
to
verify
the
vacuum
integrity
of
the
circuit
breaker
.
This
test
is
conducted
on
the
circuit
breaker
with
the
its
primary
contacts
in
the
Open
position
.
^
DANGER
High
Potential
tests
employ
hazard
-
ous
voltages
which
will
cause
severe
personal
injury
and
death
.
Follow
safe
procedures
,
exclude
un
-
necessary
personnel
and
use
safety
bar
-
riers
.
Keep
away
from
the
breaker
during
application
of
test
voltages
.
Disconnect
the
plug
jumper
from
between
the
circuit
breaker
and
switchgear
before
conduct
-
ing
high
potential
tests
.
After
test
completion
,
ground
both
ends
and
the
middle
portion
of
the
vacuum
interrupter
to
dissipate
any
static
charges
.
Figure
50
.
Close
/
Trip
Control
Switch
of
Standard
Switch
-
gear
Assembly
.
Courtesy of NationalSwitchgear.com