Siemens GMI Series - Overhaul Procedures; Circuit Breaker Overhaul Schedule; Component Replacement

Maintenance
&
Overhaul
Page
26
Electrical
Control
Checks
The
electrical
controls
of
the
GMI
circuit
breaker should
be
checked
during
annual
inspections
to
verify
absence
of
any
mechanical
damage
,
and
proper
operation
of
the
automatic
spring charging
and
Close
and
Trip
circuits
.
Unless
otherwise
noted
,
all
of
these
tests
are
performed
without
any
control
power
applied
to
the
circuit breaker
.
Check
of
the
Wiring
and Terminals
1
.
Physically
check all
of
the breaker
wiring
for
evidence
of
abrasion
,
cuts
,
burning
or
mechanical
damage
.
2
.
Check
all terminals
to
be
certain
they
are
solidly
attached
to
their
respective
device
.
Figure
48
shows the terminals
for
the
Close
solenoid
.
The
terminals
of
the
trip
solenoid
and the
spring
charging
motor
are
similar
.
Figure
49
.
Secondary
Disconnect
Fingers
.
Automatic
Spring
Charging
Check
-
Control
Power
Required
Repeat
the
automatic
spring
charging
check described
in
the
section entitled
Installation
Checks
&
Initial
Functional
Tests
.
Primary
tasks
of
this
check
are
:
1
.
The
breaker
is
energized
with
control
power
for
this
check
.
2
.
De
-
energize
the
source
of
control
power
.
Figure
1
.
3
.
Install
the
breaker
end
of
the
split
plug jumper
over
the
secondary
disconnect
of
the
circuit breaker
.
The
split
plug
jumper
has
one
male
and
one
female
connector
and
cannot
be
installed
incorrectly
.
Figure
7
.
4
.
Install the
switchgear
end
of
the
plug
jumper
over
the
secondary
disconnect
block
inside
the
switchgear
.
Figure
8
.
5
.
Energize
the
control
power
source
.
6
.
When control
power
is connected
to
the
circuit
breaker
,
the
closing
springs
should
automatically
charge
.
Visually
verify
that
the
closing
springs
are
charged
.
Figure
48
.
Terminals
for
Close
Solenoid
.
Check
of
the
Secondary
Disconnect
In
addition
to
checking
the terminals
of
the
secondary
disconnect
,
the
contact
fingers
need
to
be
free
to
move
without
binding
.
Figure
49
shows
the
secondary
disconnect
fingers
.
Depress
each
finger
,
confirm
presence
of
spring
force
(
con
-
tact
pressure
)
,
and
verify
freedom
of
motion
.
(
Courtesy of NationalSwitchgear.com