GE Limitamp CR194 - Preventive Maintenance Schedule

CR
194
Vacuum
Limitamp
400
Ampere
Control
In
these
routine
inspections
,
four
basic
categories
of
deteriorating
influences should be
kept
in
mind
:
la
.
The
effect
of
foreign
material
:
Dirt
and
dust
from
the
environment such
as
wood
fibers
,
coal
dust
,
cement
,
lamp
black
,
lint
.
lb
.
The
effect of
chemicals
in
the
atmosphere
:
such
as
sulfur dioxide
,
chlorine
,
some
hydrocarbons
and salt
water
.
2
.
Mechanical
wear
and
fatigue
on
all
moving
parts
.
3
.
Heat
.
4
.
Loose
joints
and connections
.
5
.
Perform
vacuum
interrupter
integrity
test
as
de
-
scribed
in
these
instructions
.
Follow
directions
in
these instructions
for
obtaining
access
to
all
sections
of
the controller
including high
-
voltage
door
interlocking
.
Also
,
refer
to
GEH
-
5306
for
directions relative
to
inspection
of
the
high
-
voltage
contactor
.
The
following
are some
specific
recommendations
:
1
.
Check
for
cleanliness
generally
,
but
particularly
for
accumulation
of
any
foreign
material
on
insulators
.
Voltage
failures
can
result
from
tracking
across
insula
-
tion
surfaces
when
they
are
dirty
.
The
primary
circuit
insulation
on
the controller
may
be checked
phase
to
phase
and
phase
to
ground
using
a
2500
volt
megger
.
2
.
Check
for
abrasive
material
accumulated
in
the
isolating
mechanism
and
mechanical
interlock
bearing
and
cam
surfaces
.
3
.
Check
for
buildup
of
dust
or
dirt which would reduce
any
air
or
surface
voltage
clearances
.
Figure
59
,
Method
of
connecting
test
leads
to
Interrupter
for
vacuum
integrity
test
.
3
.
Reverse
the leads
and
repeat
the
test
.
4
.
If
no
breakdown
occurs
the
interrupter
is
in
accept
-
able condition
.
If
a
breakdown
occurs
the
interrupter
should be
replaced
.
Refer
to
the
“
Interrupter
Replace
-
ment
”
section
in
GEH
-
5306
.
Note
:
No
attempt
should
be
made
to
try
to
compare
the condi
-
tion
of
one
vacuum
interrupter
with
another
nor
to
correlate
the
condition
of
any
interrupter
to
low values
of
DC
leakage
cur
-
rent
.
There
is
no
significant
correlation
.
5
.
Alter the
high
potential
voltage
is
removed
from
the
interrupters
,
the metal
end
caps
of
the
interrupters
should
be
discharged
with
a
grounding
stick
to
remove
any
residual
electrical
charge
.
4
.
Excessive
heat
can
cause
wire
and
cable
insulation
breakdown
.
Therefore
,
check
for
any
evidence
of
6
.
Make
sure
that all
connections
are
tightened
properly
melting
,
discoloring
,
deterioration
of
wire
and cable
,
to
16
lb
.
-
ft
.
Reconnect
load
cables
and
replace
CPT
fuses
,
5
.
The
isolating
mechanism
has
a
life
expectancy
of
approximately
6000
operations
.
If
the
application
is
such
that
the
mechanism
is
operated
more
than
twice
each
day
,
then
the
mechanism
should be
checked
at
the
end
of
each
1000
operations
,
otherwise
a
yearly
inspec
-
tion
is
recommended
.
6
.
Periodic
checks
of
dimensions
of
the
isolating
mecha
-
nism
and
mechanical interlocks
is
strongly
recom
-
mended
.
Follow the section
in
these
instructions
entitled
“
ISOLATING MECHANISM
AND
MECHANI
-
CAL
INTERLOCK
”
.
7
.
When
any
part
of
the
isolating
mechanism and
mechanical
interlock
is
replaced
,
all
dimensions and
checking
procedures
referred
to
under
No
.
6
<
tbove
should
be
followed
to
be
sure
the
system
is
in
normal
working
order
.
Preventive
Maintenance
Guide
Warning
:
Before performing
any
preventive
maintenance
on
the
Vacuum
Limitamp
controller
all
power
must
be removed
from
the
equipment
and all
rotating
equipment
must
have
coasted
to
a
complete
stop
.
Maximum trouble
-
free
service
from
Vacuum
Limitamp
controllers
requires
periodic inspection
,
preventive
maintenance
,
and
periodic
cleaning
.
A
definite
sched
-
ule should
be
maintained
for
inspection
,
the
frequency
depending
upon
operating
conditions
.
Preventive
maintenance
activity
should then
be established
as
the
result
of
periodic
inspection
.
32
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