Siemens GMI Series

Installation
Checks
and
Initial
Functional Tests
3
.
Install
the
switchgear
end
of
the
plug
jumper
shown
in
Figure
8
to
the
secondary
disconnect
block inside the
switchgear
cubicle
.
The
jumper
slides
into
place
.
The
plug
jumper
interconnects all control
power
and
signal
leads
(
e
.
g
.
,
remote
trip
and close
contacts
)
between the switch
-
gear
and
the
circuit breaker
.
4
.
Energize
(
close
)
the
control
power
circuit disconnect
(
Fig
-
ure
1
)
.
5
.
Use the
Close
and
Trip
controls
(
Figure
2
)
to
first
Close
and
then
Open
the
circuit breaker
contacts
.
Verify
contact
positions
visually by
observing
the
Open
/
Closed
indicator
on
the
circuit
breaker
.
6
.
De
-
energize
control
power
by
repeating
Step
1
.
Disconnect
the
plug jumper
from
the
switchgear
first
and
next
from
the
circuit breaker
.
7
.
Perform
the
Spring
Discharge
Check
again
.
Verify
that the
closing springs
are
discharged
and the
primary
contacts
of
the
GMI
circuit
breaker
are
open
.
Final
Mechanical
Inspections
without
Control
Power
1
.
Make
a
final
mechanical
inspection
of
the circuit breaker
.
Verify
that
the
contacts
are
in
the
Open
position
,
and
the
closing springs
are
Discharged
.
2
.
Check
the
upper
and
lower
primary
studs
and
contact
fingers
shown
in
Figure
9
.
Verify
mechanical
condition
of
finger
springs
and the
disconnect
studs
.
3
.
Coat
movable
primary
contact
fingers
(
Figure
9
)
and the
secondary
disconnect
contacts
(
Figure
9
and
22
)
with
a
light
film
of Siemens
Contact
Lubricant No
.
15
-
171
-
370
-
002
.
4
.
The
GMI
vacuum
circuit
breaker is
ready
for
installation
into
its
assigned
cubicle
of
the metal
-
clad
switchgear
.
Refer
to
removal
procedures
and
re
-
install the
circuit breaker
into
the
switchgear
.
5
.
Refer
to
the
Switchgear
Instruction Manual
for
functional
tests
of
an
installed circuit breaker
.
Figure
9
:
Rear
of
GMI
Breaker
with
Primary
Disconnects
.
Figure
8
:
Split
Plug
Jumper
Connected
to
Switchgear
.
7
Courtesy of NationalSwitchgear.com