IB
6
,
2.7
.
7
-
3
C
Pago
9
aii
A
$
DS
attOWH
aoveflf
'
A
potentiometer
with
mounting
support
,
used
in
conjunction
with
an
oscilloscope
or
oscillograph
,
and
Instructions
are
available
on
spedalorderWspecificalfycheekingopeningandcloslng
speeds
.
Racking
Mechanism
(
See
Fig
.
7
)
The
circuit
breaker
racking
mechanism
is
adjusted
lor
proper
operation
and
should
next
bo
disturbed
unless
ft
becomes
possible
to
dose
the
breaker
during
a
racking
operation
,
it
may
be
possible
that
interlocked
blocking
members
are
not
positioned
properly
,
which
should
be
corrected
as
follows
;
Remove
the
lower
Iron
i
mehan
ism
coverplate
and
with
the
circuit
breaker
closed
,
make
adjustments
by
regulating
the
length
of
connecting
rod
(
1
)
for
1
/
35
inch
minimum
to
3
/
32
inch
maximum
clearance
at
between
trip
link
(
3
)
and
blocking
lever
(
2
)
,
CONTROL
Device
The
circuit
breaker
dosing
and
opening
times
should
be
within
the
following
time
ranges
for
normal
operation
.
sums
MASV
.
25
-
35
40
-
60
NOTES
:
1
,
6
elowO
°
C
,
the
closing
times
will
increase
(
butwith
no
reduction
In
dosing
force
)
;
and
opening
times
will
be
within
the
limits
,
The
control
device
is
adjusted
before
leaving
the
factory
.
It
is
recommended
that
no
attempt
be
made
to
adjust
the
Internal
relays
and
contacts
of
this
device
in
the
field
.
If
replacement
of
the
controldevice
is
required
,
the
close
latch
release
rod
(
5
)
overtravel
may
be
adjusted
as
described
below
.
Close
Latch
Rod
Release
Overtravel
2
.
Adjustments
to
correct
speeds
.
If
found
to
b
^
outside
limits
,
are
critical
and
the
nearest
District
Office
should
be
contacted
for
recommendations
.
Operating
Mechanism
The
various
mechanism
adjustments
described
in
the
following
sections
apply
to
all
circuit
breakers
covered
by
this
Instruction
Bulletin
,
1
,
Back
off
on
dose
latch
release
rod
(
5
)
and
check
that
the
circuit
breaker
witl
not
close
electronically
or
manually
pushing
up
on
close
release
rod
(
$
)
to
the
full
extent
of
its
travel
.
2
.
Charge
the
dosing
springs
.
Push
up
on
cteea
latch
release
rod
(
5
)
to
the
full
extent
of
its
travel
.
While
Holding
the
close
latch
release
rod
in
this
position
,
turn
up
on
close
latch
release
rod
(
$
)
until
the
circuit
breaker
doses
.
Turn
close
latch
release
rod
(
5
)
up
an
additional
1
1
/
2
turns
.
-
Latch
Engagement
(
Bite
)
(
Refer
to
Fig
,
$
)
The
latch
engagement
adjusting
screw
(
3
)
is
located
to
the
right
of
the
right
-
hand
mechanism
housing
(
1
)
.
It
can
be
reached
easily
from
the
top
of
the
circuit
breaker
,
after
removal
of
the
top
cover
plate
,
.
'
•
*
*
"
*
s
s
w
'
v
!
r
O
—
\
To
adjust
the
latch
(
2
)
engagement
,
proceed
as
follows
:
1
.
Back
off
adjusting
screw
(
3
)
to
assure
exoesslve
latch
engage
-
ment
.
:
D
F
2
.
Close
the
circuit
breaker
.
3
.
Turn
adjusting
screw
(
3
)
down
slowly
until
the
latch
just
releases
*
tripping
the
circuit
breaker
,
4
.
Back
off
the
adjusting
screw
(
3
)
2
Turns
,
i
.
Rouen
.
Close
IAYCH
%
CHAPC
^
G
CAW
3
.
ACTUATOR
,
I
,
WIT
SWITCH
6
.
CCOSS
LA
*
rcw
*
&
£
A
$
C
ftoo
«
,
SRftlWC
.
CUDSQ
LAtCW
RElgASG
R
00
7
.
SECONDARY
Close
LATCH
*
.
PRIMARY
CIOS
*
LAttX
Fig
,
$
*
CQntrol
Device
Adjustment
}
.
5
Courtesy of NationalSwitchgear.com
