Siemens 81000 90H35

Maintenance
Page
12
Proper
installation
of
phase
barriers
Vacuum
Bottles
Blown
Fuse
Trip
Mechanism
Main
Coil
Auxiliary
Contacts
Fuse
Clips
Terminals
and
Joints
Cleaning
Tightening
Torques
Mechanical
and
Electrical
Operation
of
the
Contactor
Mechanical
Latch
Mechanism
Maintenance
of
the
vacuum
contactor
should
be
only
be
performed
with
the
contactor
deenergized
and
withdrawn
from
the
controller
compartment
.
In
the
case
where
a
vacuum
bottle
must
be
replaced
,
control
power
is
required
to
close
the
contactor
.
AWARNING
Accidental
contact
with
energized
wiring
or
bus
system
can
cause
electric
shock
,
burn
or
electrocution
.
Disconnect
and
lock
-
out
incoming
power
and
control
voltage
sources
before
beginning
work
on
this
or
any
other
electrical
equipment
.
Check
all
control
circuit
terminals
with
a
voltmeter
to
make
certain
that
the
equipment
is
totally
deenergized
.
Use
only
approved
high
voltage
test
equipment
to
check
voltage
on
power
terminals
.
Do
not
attempt
to
measure
high
voltage
with
a
volt
-
ohm
meter
.
Phase
Barrier
and
Dust
Cover
Removal
and
Re
-
Installation
It
is
recommended
that
a
safety
ground
be
connected
to
the
power
bus
after
the
system
has
been
deenergized
,
and
proper
to
working
on
the
equipment
.
Follow
the
procedure
outlined
in
the
pre
-
energization
check
section
of
this
manual
before
power
is
restored
.
Type
90
H
3
vacuum
contactors
with
drawout
provisions
are
equipped
with
two
glass
polyester
interphase
barriers
and
one
horizontal
barrier
located
above
the
vacuum
bottles
which
acts
as
a
dust
cover
to
prevent
dust
and
other
foreign
material
from
accumulating
inside
the
medium
voltage
sec
-
tion
.
It
is
necessary
to
remove
these
barriers
to
perform
main
-
tenance
on
the
vacuum
contactor
.
First
remove
the
inter
-
phase
barriers
,
by
sliding
upward
and
out
.
A
tab
located
on
the
rear
of
each
interphase
barrier
engages
a
notch
in
the
dust
cover
and
locks
it
into
the
assembly
.
Once
the
inter
-
phase
barriers
are
removed
,
the
dust
cover
will
slide
out
toward
the
rear
(
disconnect
finger
)
end
of
the
contactor
.
Before
placing
the
contactor
back
in
service
,
both
interphase
barriers
and
the
dust
cover
must
be
replaced
in
their
proper
locations
.
Safety
For
the
safety
of
maintenance
personnel
as
well
as
others
who
might
be
exposed
to
hazards
associated
with
maintenance
activities
,
the
safety
related
to
work
practices
of
NFPA
70
E
,
part
II
should
always
be
followed
when
working
on
electrical
equipment
.
Maintenance
personnel
should
be
trained
in
the
safety
practices
,
procedures
and
requirements
that
pertain
to
their
respective
job
assignments
.
The
customer
must
establish
a
periodic
program
to
ensure
trouble
-
free
and
safe
operation
.
The
frequency
of
inspection
,
periodic
cleaning
,
and
preventive
maintenance
schedule
will
depend
upon
the
operation
conditions
.
NFPA
Publication
70
B
“
Electrical
Equipment
Maintenance
”
may
be
used
as
a
guide
to
establish
such
a
program
.
A
preventive
maintenance
program
is
not
intended
to
cover
reconditioning
or
major
repair
,
but
should
be
designed
to
reveal
,
if
possible
,
the
need
to
such
actions
in
time
to
prevent
malfunctions
during
operation
.
The
following
items
should
be
included
in
any
maintenance
checklist
.
For
more
details
read
the
suc
-
ceeding
pages
.
Blown
Fuse
Trip
Mechanism
NOTE
Use
of
the
trip
mechanism
with
fuses
other
than
Siemens
type
FM
motor
fuses
can
result
in
failure
of
the
trip
bar
to
operate
.
Courtesy of NationalSwitchgear.com