Siemens 81000 90H35

Maintenance
after
a
Fault
Page
19
AWARNING
Inspection
The
following
areas
should
be
inspected
after
a
fault
has
occurred
.
Enclosures
External
evidence
of
enclosure
deformation
usually
is
indica
-
tive
of
damage
within
.
Extensive
damage
will
require
replace
-
ment
of
the
enclosure
parts
and
the
enclosed
equipment
.
Insure
that
door
mounted
equipment
and
safety
interlocks
function
properly
.
Verify
that
hinge
and
latch
integrity
is
maintained
.
Accidental
contact
with
energized
wiring
or
bus
system
can
cause
electric
shock
,
bum
or
electrocution
.
Disconnect
and
lock
-
out
incoming
power
and
control
voltage
sources
before
begin
-
ning
work
on
this
or
any
other
electrical
equipment
.
Only
qualified
personnel
should
be
in
-
volved
in
the
inspection
and
repair
proce
-
dure
and
all
plant
safety
procedures
must
be
observed
.
Terminals
and
Internal
Conductors
Replace
all
damaged
parts
which
show
evidence
of
dis
-
coloration
,
melting
or
arcing
damage
.
Special
attention
should
be
paid
to
the
stab
fingers
.
Overload
Relays
The
complete
overload
relay
must
be
replaced
if
burnout
of
the
heater
element
has
occurred
.
Any
indication
of
an
arc
striking
or
burning
the
overload
relay
also
requires
replace
-
ment
.
If
there
is
no
visual
indication
of
damage
that
would
require
replacement
,
contact
operation
must
be
verified
by
electrical
-
ly
or
mechanically
tripping
and
resetting
the
overload
relay
.
Fuse
Holders
Replace
fuse
holders
if
the
insulation
mounts
,
barriers
,
or
fuse
clips
show
signs
of
damage
,
deterioration
,
heating
,
distortion
or
looseness
.
Fuses
Always
replace
all
three
fuses
in
a
three
phase
circuit
even
though
only
one
or
two
are
open
circuited
since
internal
damage
suffered
by
fuses
not
replaced
could
result
in
nuisance
shut
-
down
later
.
Perform
the
“
Pre
-
Energization
Check
”
procedures
detailed
in
this
manual
before
restoring
the
equipment
to
service
.
Check
all
control
circuit
terminals
with
a
voltmeter
to
make
certain
that
the
equip
-
ment
is
totally
deenergized
.
Use
only
ap
-
proved
high
voltage
test
equipment
to
check
voltage
on
power
terminals
.
Do
not
attempt
to
measure
high
voltage
with
a
volt
-
ohm
meter
.
It
is
recommended
that
a
safety
ground
be
connected
to
the
power
bus
after
the
sys
-
tem
has
been
deenergized
,
and
prior
to
working
on
the
equipment
.
Follow
the
pro
-
cedure
outlined
in
the
pre
-
energization
check
section
of
this
manual
before
power
is
restored
.
General
The
excessive
currents
occurring
during
a
fault
may
result
in
structure
,
component
and
/
or
conductor
damage
due
to
mechanical
distortion
,
thermal
damage
,
metal
deposits
,
or
smoke
.
After
a
fault
,
repair
the
cause
of
the
fault
,
inspect
all
equipment
per
NEMA
Standards
Publication
No
.
ICS
2
-
302
and
make
any
necessary
repairs
or
replacements
prior
to
placing
the
equipment
into
service
again
.
Be
sure
that
all
replacements
(
if
any
)
are
of
the
proper
rating
and
are
suitable
for
the
application
.
If
in
doubt
,
consult
your
field
sales
repre
-
sentative
.
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