Siemens GMI Series

Maintenance
Checks
of
the
Stored
Energy
Operator
Mechanism
The
stored
energy
operator
checks
are
divided into mechani
-
cal and
electrical
checks
for
simplicity
and better
organization
.
This
first
series
of
checks determine
if
the basic
mechanism is
clean
,
lubricated
and
operates
smoothly
without control
power
.
The
contact
erosion check
of
the
vacuum
interrupter
is also
performed
during
these tasks
.
Lubricate
all
non
-
electrical
moving
or
sliding
surfaces
with
a
light
coat
of
synthetic
grease
or
oil
.
Lubricants
composed
of
diester
oils
and lithium
thickeners
will
be
compatible
.
Shell
(
drawn
cup
)
needle
bearings
:
Use either Beacon
(
Exxon
)
325
(
reference
18
-
658
-
676
-
422
and
part
number
15
-
337
-
131
-
001
)
,
or
Supermil
(
Amoco
)
A
-
72832
(
reference
18
-
758
-
676
-
423
)
,
or
Anderol
732
.
Pivots
,
sliding
,
and
/
or
rolling
surfaces
and
general
lubrication
:
Use
Anderol
732
aerosol
synthetic
fluid
grease
(
reference
part
number
15
-
172
-
816
-
058
)
.
In
addition
to
lubricating
the stored
energy
operating
mecha
-
nism
,
use
Anderol
732
to
lubricate
both the
OD
of
the
bushing
and
the
ID
of
the wheel
for
the
four
floor
wheels
.
Fastener
Check
-
Inspect
all
fasteners for
tightness
.
Both
lock
-
nuts
and
retaining rings
are
used
.
Replace
any
fasteners
that
appear
to
have been
frequently
removed
and
replaced
.
Manual
Spring
Charging
and
Contact
Erosion
Checks
-
Perform
the
Manual
Spring Charging
Check
contained
in
the
section
describing
the Installation
Check
and Initial
Functional
Tests
.
The
key
steps
of
this
procedure
are
repeated
here
.
1
.
Insert the hand
charging
lever into the
manual
charge
handle
socket
at
the
front of
the
operator
control
panel
.
Figure
20
shows
the
lever
inserted
.
Up
and down
motion
of
the lever
charges
the
closing
springs
.
Continue
cranking
until
the
Charged
flag
appears
in
the window
of
the
spring
indicator
.
2
.
Press the
Close
(
black
)
pushbutton
.
The
contact
position
indicator
on
the
operator
control
panel
should indicate that
the breaker
contacts
are
closed
.
3
.
Perform
the
contact
erosion check
.
Contact
erosion
occurs
when
high
fault
currents
are
interrupted
or
when
the
vacuum
interrupter
is
nearing
the
limit
of
its
contact
life
.
Determination
Maintenance
and
Lubrication
Table
2
:
Maintenance and Lubrication Intervals
ANSI
C
37.06
Table
8
-
Usual
Service
Conditions
Maintenance Based
Upon
Number
of
Breaker
Closing
Operations
Number
of
Years
/
Closing
Operations
Breaker
Type
5
-
GMI
-
350
15
-
GMI
-
1000
5
years
1
/
1
,
000
operations
5
years
1
/
2
,
000
operations
All
others
Five
year
interval
for GMI
breakers
manufactured
January
,
1992
or
later
.
One
year
interval
for
units
manufactured
earlier
.
The
interrupter
operator
mechanism is shown
in
Figure
35
with
the
front
cover
and the
operator
control
panel
removed
to
show
construction
details
.
Both
the
tripping spring
and the
two
closing springs
are
shown
.
The movable
end
of
each
closing
spring
is connected
to
a
crank
arm
.
The
movable end
of
the
opening
spring
is
connected
to
the
jack
shaft
by
a
pull
rod
.
The
dashpot
is
connected
to
the
jack
shaft
operating
shaft
by
a
pushrod
linkage
.
Clean
the entire stored
energy
operator
mechanism
with
a
dry
,
lint
-
free
cloth
.
Check
all
components
for
evidence
of
excessive
wear
.
Place
special
attention
upon
the
closing
spring
cranks and
the
various
pushrods
and
linkages
.
V
eye
-
line
of
sight
insert
mirror
here
ey
®
:
line
of
sight
©
Typical
breaker
with
vacuum
interrupter
having
internal
arc
shield
Typical
breaker
with
vacuum
interrupter
having
external
arc
chamber
Figure
34
:
Front
View
of
Operator
Mechanism
.
Figure
36
:
Contact
Erosion
Check
Mark
.
23
Courtesy of NationalSwitchgear.com