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4 9
looking
at Fig
.
7b
,
should be
1
/
32
to
1
/
16
inch
.
seen from
the
rear of
the chassis
,
clearance
can
be
adjusted
at the
two
operating rods of the puffer
piston
. When
the
breaker is fully open
, the puffer piston
should
be
at
the top limit of its travel .
With
the
piston held in
this
position
,
adjust
piston operating
rods
to proper
clearances
of the roller . Lengthening rods
increases
clearance
.
hand
.
In either
case
,
at the
completion of
the charging operation there should
be an
audible "
click
"
as
the
crank arm goes
over center
.
With electrical charging the
motor
should automatically cut off at the
sound of the click
.
With
hand
charging ,
the handle will tend to run away from the
hand
for
a short
distance as the click is
heard .
the ratchet handle after that
point ,
as
it
simply puts a high load
on the
spring
release latch
and related
parts
.
On
the breaker
,
this
can
best be
This
No
more force
should be put on
SOLENOID
MECHANISM
,
INSPECTION
AND ADJUSTMENT
Close and open the breaker several times
electrically with normal control voltage
.
Operation
should
be snappy and
without
hesitation
or sluggishness
.
Note whether
or not contacts come to
the proper position
when
closed
,
as shown in
Fig
.
21 .
If
there
are
no
signs
of shipping
damage
or of
anything interferring with
mechanical
movement
, this is a satisfactory
check for
the
closing
and opening of the
breaker before
placing it
in service .
As a
further check on mechanism ad
-
justment
,
refer to Fig
.
10 c . As indicated
the clearance between the
tripping
latch
rear
roller and the
tripping
cam
should
be
1
/
32
to
1
/
16 inch
.
This is necessary
for
proper resetting .
Referring
to
Fig
. 9
a
this
adjustment is
made by turning the
tripping
cam
and tripping latch adjusting
screw
.
Counterclockwise turning increases
clearance .
In these
operations
,
closing and opening
should
be snappy
,
without hesitation or
sluggishness
.
Under
normal circumstances
,
that is if there are no
signs
of shipping
damage or
of
anything interferring with
mechanical
movement
,
this is
a
satis
-
factory
check for
closing
and
opening
of
a breaker
before placing it in service
.
With the breaker
open and spring
charged
,
as
in Fig
.
7 b
,
there are two
im
-
portant
points
where there
must
be
enough
clearance for satisfactory
operation
.
1
.
Referring
to
Fig
.
7
b
,
the clearance
between
the
rear
roller of the tripping
latch
and the vertical
surface of
the tripping
cam should be
1
/
32
to
1
/
16 inch
.
If there
is no clearance
at
all
,
the tripping latch
roller cannot
drop into place and the tripping
trigger
can not reset to
the untripped
position
.
Therefore
,
the breaker will not
close .
This clearance
can
be adjusted by
the
screw
on
the front of
the frame under
the handling
dolly tongue
,
as shown
in
Fig
.
6
.
it is necessary
to
look
from the bottom
.
To
do this
it is easiest
to
turn
the breaker
carefully
over on
its side ,
as
shown
in
Fig
. 6 .
First loosen the lock
nut
.
Turn
the
screw with a screwdriver
,
clockwise
to decrease
clearance ,
hold
and retighten
the locknut
.
LATCH
CHECK SWITCH ADJUSTMENT
In order
to see
this clearance
Refer to Fig
.
11 a
.
The latch check switch
is a Micro Switch
which
makes
contact
when the
tripping trigger is
in the fully
reset
position
ready for the breaker to
close
.
Where
the tripping
trigger is
not
reset
,
the latch check
switch is open
.
When
properly connected in the control
circuit
it will
not
allow the closing circuit to be
energized until the mechanical resetting
of the
tripping trigger is complete
.
2
.
The clearance between the closing
cam follower roller and the closing cam
,
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