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Table
3 . Check Points
for Inspection
Checks should be done
in
accordance
with INSPECTION AND MAINTENANCE INTERVALS
>
z
Check
item
Criteria
No
.
Check
point
Check method
What
to
do
Remarks
H
Visual Check
There should be no dust and
foreign
matter
Remove
foreign
matter
by wiping
clean
Operating
Mechanism
Dust
and
foreign
matter
1
m
Z
>
z
Smooth
operation
Operation
should
be smooth
Manual
operation
Determine cause
of mis
-
operation
o
m
Check
by
feel
and
sight
Lubrication of
bearing pins
Apply
a small
amount
of
machine oil
Visual Check
Must
rotate
smoothly
Closing and
Tripping shafts
Funcional
Check
Interlocks
,
key
-
switches
, etc
.
Must
operate
smoothly
,
securely
and
properly
Reinstate
to
proper operation
condition
2
Contact wear
Wipe length
should be
greater
than 1 mm
(
0.04 in .
)
Pg .
27
Vacuum
interrupter
Measurement
of wipe length
Factory is
required if
the
wipe length
is 1
mm .
(
.
039 in
.
)
or
less
See Vacuum
Check Procedures
Vacuum
pressure
Factory service
required
when
vacuum
pressure
is
not
sufficient
Pg
. 28
Number of
open
-
close
operations
Counter or
Years of
Service
When the
counter
reading reaches
6
,
000 or
6
years of
service
has been reached
(
for
the
rated
current
interruption
)
,
check the
internal
pressure
. Follow
up
checks should
be made
every
3
years of
service thereafter
or until the
counter
reading
reaches 10
,
000 .
For the method of checking the vacuum
pressure
,
see Vacuum Check section
.
Factory
service is
required if
the
internal
pressure
is
not
sufficient
or when the
counter
reading
reaches 10
,
000
Pg
. 28
Contamination
Visual Check
There should be no dust or foreign
matter
on the interrupter .
Wipe with a
clean cloth
dampened
with
alcohol
*
U
0
)
IQ
<
D
ro
01
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