GE Limitamp CR194 - Emergency Door-Defeater Latch Use; Inspection, Maintenance, and Servicing Guidelines; Vacuum Contactor Maintenance; Isolating Mechanism and Mechanical Interlock Adjustment

CR
194
Vacuum
Limitamp
400
Ampere
Control
Warning
:
All
power
must
be
removed
from
the
main
bus
before
attempting
to
adjust
the
isolating
switch
mechanism
.
1
.
After
removing
all
power
to
the
controller
,
and
as
described
in
steps
1
Sc
2
of
the
Mechanical
Operation
Check
,
rotate
the
isolating
switch
handle
to
the
ON
position
.
Then
remove
the
fixed
barrier
(
Figure
33
)
by
removing
the
retaining
screws
that
hold
it
in
place
.
Retain
the
hardware
for
reassembly
.
Some
of
the
barrier
mounting
hardware
is
nylon
type
hardware
.
Note
the
location
of
these
parts
so
they
may
be
reassembled
properly
.
2
.
Near
the
end
of
each
switch
blade
assembly
,
an
adjusting
nut
is
located
along
with
a
Belleville
washer
type
spring
.
To
adjust
the
blade
pressure
the
nut
must
be
adjusted
.
Loosen
the
small
set
screw
located
on
each
of
the
retaining
nuts
to
enable
adjustment
.
3
.
Loosen
the
adjusting
nut
at
the
top
of
the
blades
.
With
your
fingers
retighten
the
nut
until
all
the
slack
is
out
between
the
blades
,
stationary
contact
,
spring
washer
8
c
nut
,
then
tighten
an
additional
Vx
(
one
-
eighth
)
turn
.
This
procedure
provides
the
necessary
0.005
inch
spring
compression
of
the
blades
.
4
:
Tighten
the
set
screw
on
the
nut
to
lock
the
adjust
-
ment
in
position
.
Use
caution
to
prevent
turning
the
nut
on
the
main
screw
while
tightening
the
set
screw
.
5
.
When
the
adjustment
is
complete
for
all
three
phases
,
rotate
the
isolating
switch
handle
to
the
OFF
position
.
Then
,
apply
a
thin
coating
of
Mobil
Temp
SHC
-
32
grease
to
the
contact
surfaces
of
the
male
stab
portion
of
the
disconnect
.
To
properly
adjust
the
pivot
point
Belleville
washer
type
spring
,
return
the
isolating
switch
handle
to
the
ON
position
per
step
1
above
.
Then
,
follow
the
steps
below
:
1
.
On
each
phase
,
loosen
the
set
screw
on
the
pivot
point
adjusting
nut
.
2
.
Loosen
the
adjusting
nut
and
then
retighten
using
your
fingers
until
the
nut
is
just
snug
and
no
side
play
of
the
parts
is
evident
.
3
.
Using
wrenches
tighten
the
adjusting
nut
an
addi
-
tional
one
-
half
(
Vi
)
turn
and
tighten
the
set
screw
to
hold
the
adjustment
in
place
.
4
.
Rotate
the
isolating
switch
handle
to
the
OFF
position
,
then
reinstall
the
isolator
switch
barrier
.
If
necessary
the
viewing
window
may
be
cleaned
before
reinstallation
of
the
barrier
.
Use
a
soft
cloth
and
a
mild
soap
and
water
solution
or
a
commercial
cleaner
such
as
Windex
or
other
similar
cleaner
.
Warning
:
Severe
injury
or
death
may
result
if
the
equipment
is
energized
with
the
mechanical
interlocks
defeated
.
Remove
all
power
from
the
equipment
before
defeating
any
of
the
mechanical
interlocking
mechanisms
.
Door
-
Defeater
Latch
Warning
:
The
j
'
ollowing
steps
should
only
be
taken
as
a
last
resort
to
enter
a
malfunctioning
controller
;
It
is
imperative
that
all
power
to
the
main
bus
be
removed
before
proceeding
.
IN
CASE
OF
EMERGENCY
,
remove
all
power
to
the
controller
;
then
the
high
-
voltage
door
may
be
opened
with
the
contactor
in
the
closed
position
and
with
the
isolating
switch
closed
by
using
the
hex
-
head
bolts
,
located
to
the
lower
left
of
the
isolating
-
switch
handle
,
as
follows
:
Warning
:
Do
not
proceed
unless
all
power
to
the
controller
is
removed
.
Doors
must
not
be
opened
with
the
power
connected
to
the
bus
.
1
.
Turn
the
door
latches
Z
\
turn
counterclockwise
.
2
.
'
Remove
the
right
-
hand
hex
-
head
bolt
,
as
shown
in
Figure
52
.
3
.
Turn
the
left
-
hand
bolt
]
A
turn
counterclockwise
.
Figure
53
shows
the
bolts
from
the
inside
.
The
door
may
then
be
opened
.
Warning
:
Defeating
the
door
interlock
leaves
the
controller
connected
to
the
bus
.
The
bus
power
must
be
removed
.
On
some
one
-
high
enclosures
,
the
low
-
voltage
control
panel
serves
as
a
barrier
to
isolate
the
high
-
vokage
control
-
power
transformer
and
fuses
.
An
interference
pin
,
shown
in
Figure
54
,
prevents
swinging
this
low
-
voltage
panel
out
until
the
high
-
voltage
door
is
opened
.
Inspection
,
Maintenance
,
and
Servicing
Vacuum
Contactor
Complete
maintenance
and
adjustment
instructions
for
the
high
-
voltage
contactors
are
presented
in
GEH
-
5306
.
Refer
to
that
instruction
for
all
problems
of
servicing
and
adjust
-
ing
;
and
to
the
proper
renewal
parts
bulletin
for
renewal
parts
.
Contactor
tip
life
depends
on
the
severity
of
the
service
,
but
in
any
case
,
it
is
recommended
that
the
contactor
tip
wear
be
checked
at
least
once
a
year
or
in
very
high
duty
cycle
operations
,
after
every
250
,
000
operations
.
Isolating
Mechanism
and
Mechanical
Interlock
Warning
:
Under
no
circumstances
should
the
isolation
switch
be
inspected
or
adjusted
with
power
applied
to
the
main
bus
.
The
quick
-
make
quick
-
break
isolation
switch
assembly
is
adjusted
and
tested
at
the
factory
.
Under
normal
circumstances
the
switch
does
not
need
adjustment
,
however
,
if
conditions
require
it
the
switch
may
be
adjusted
in
the
field
.
To
adjust
the
isolating
switch
the
following
steps
should
be
followed
:
29
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