Allis-Chalmers BWX-6637-5, Инструкция

Страница: 33 / 88

I.
(
R
e
f e r to Figure 2)
Trip iatch (216)
should
h
a
v
e
an
e
ng
ag
e
m
e
n t of
.06211 plus
or
m i
n u
s
.015"
on t
r
i
p shaft
(
2
1 5
).
Measurement is
m
a
de
with the l
a
t c h
re�ting
on t h
e
s�aft
in
the reset
position.
2 .
Main
Contact �ake
(
Ref�r
to Fig�re 6)
Compression of c
on
t
a
c
t fingers (619)
should
be between .093" ar.d
.125''. This
is
the
difference
in
the
m
e
a
s
u r
eme
n t from the
breaker
base to
the
c
e
n
t e r
of
t
h
e finger c o nt
a
c
t
surface w h e
n
the breaker
is
open
and
the measurement
in the same
place
wnen
the breaker is
closed. Th!s
is checked with
a
n o
rma
l closing operatic�
-
not
maintenance closing. Adjustment is provided by positioning
screws
(603) after loosening n u
t
s (62 1).
Counterclockwise ro t a tio
n
of
screws {608} in
c
re
a
se
s
compression.
Care
s
h
o
u
l d
be taken to re­
tighten nuts
(621)
after
adjustment. If it is
d
e
s
i
r e d
to
check
contact
pressure, a push-type spring �cale
can be
u
s
e
d
to cQncrcss
contact
fingers (619),
w
i
t
h
breaker open.
C
o nt ac t pressure sho�ld
be between 20 and 30
po�nds.
·
3.
Make (Refer
to F i
g
ur
e
6)
With movable
a
r c
i
n
g
contact (620)
in
any
one phase touching
the
mating stationary contact
when the
breaker is closed by
the
main­
te,ance
closing
method. (see
Table
3), the
p h
a
s
e
to
p
h a s e
variation
should not exceed .062". A
d j us
t m
e
n t
may
be made
by positioning
screws (608) as In
p
a
r
a
g
r
a
ph 2, but it is
e
s
s e n
t
i a
l
that the
main
contact coo1pression be m a
i
n
t
a
i
ned
within the tolerance l
i
s
t
e
d
in
paragraph 2.
Arcing contact pressure
sho�ld
be between
30
and
40
pounds when checked
w
i t
h
a pull-type spring scale at the base cf
the
a
r
c
i
n g
contact t i p
insert
with
the breaker
c
o
n
t
a c
t
s
closed.
4.
Electricalh,
ereakers (Refer
to
Figures
2A
and
3)
a)
..-iotor Cut-Off
Switch
and i i t ion Switch -
The!e
Sl·'ii tches are
mounted
on a conmo11 bracket
that
Is set
and
rol
!-pinned
in position
d
u
r
i
n g
prod�ction
t
es
t in
g
.
J f replace­
ment is
required.
the
bracket must be positioned so that
when
roll
pins (236) in gear (235) are
at the
top
position,
thev hdve
moved plunger (233} against the
roller
of motor c u
t
-
off switch
(232) to
shut
off
the
motor .
As
the springs are charged.
drm
(231)
mvst
engage
the roller
of
spring-position �witch (230}.
Pi
lot
holes
arc
provi ded :n the
rno•>·lting bracket for dri
II
ing
and
roll-pinr.ing the replaceme'1t
assembly
in the
correct
pes
i t i on.
- a -