Allis-Chalmers BWX-6637-5, Instruction Book

Page: 59 / 88

3 .
LEAS E
T h e re l ea s e ma g n e t I s i l l u s t ra t ed I n
F i gu re
8 . D u r i ng no rma l
o p e r a t i o n
,
t r i p rod
(80 1 )
wh i ch I s a t t a
c
h
e
d t o
a
s p r i n g l oa d ed
a rma t u r e i n
s
i
d
e
t h e magne t i c re l eas e l a t ch cy l i nde r c a n no t move
d ue to
a
magne t i c
f i e l d set up by p e rma ne n t
magn e t
(802)
wh i c h h o l ds
t h e i n te r na l
a rma t u re
aga i ns t p l a t e
(8 0
3
)
o n t h e bot t om
of
t h e
ma gn e t i c re l e a s e l a t ch .
When a n ove r l oa d o r f a u l t cond i t. i on
e
x i
s
t s
,
co i I
(804)
wh i ch i s
i ns i de
on t he b o t t om
of
th e magne t i c r e l ea s e
l a t ch i s
e n e r g i z ed by
t h e s ta t i c t r i p d e v i ce c r ea t i n g a f l ux wh i c h d e c reas e s t he m a g ne t i c
ho l d f o r ce on t h e s p r i ng l oaded i n t e r n a l a rma t u r e a l l ow i n g t he
a rma t u re t o
be
f o r c e d u pwa r d d u e to t h e s p r i n g I oa d , t h e reby
a
I I ow­
i n g t r i p rod
(
80 !
)
, t o move up a ga i ns t t r i p a rm
(80 5 ) ,
i n t u r n ,
t r i pp i n g t h e c i r c u i t b r eake r . As t h e b re a ke r open s , co i l
( 804)
becomes de-ene r g i z e d d u e to d e - e ne rg i z a t i on of t h e s t a t i c t r i p
dev i ce , cam (806) r o t a t e s a rm (807) f o r c i n g s p r i ng l oa d e d a rma t u r e
a g a i ns t p l a te
( 8 0 3 )
a l l ow i n g t r i p r od
( 80 1 )
t o b e r e s e t t o t he non ­
t r i p pos i t i on .
I f t he s p r i n g l o a ded a rma t u re does not r es e t d u r i ng t r i p ope r a t i on
•� s
exp I
a
i ned a bove . s pace r s
(808)
may b e a d de d t o ob t a i n pos i t i ve
r e s e t of t h e a rma t u re .
I f
a d d i n g s pa c e r s d oe s not a l l ow a
r
m a t u
r
e
to
be r e s e t , t h e m a g ne t i c
re l e a s e l a t ch s hou l d b e rep l aced .
( I f
b r e
a
k
e
r mechan i s m i s n o t a t
f a u l t
)
.
Do not a t t emp t t o d i s a s s emb l e t h e ma g ne t i c r e l e a s e l a t c h a s t h i s
w i 1 1 d�s t roy t h e m a g n e t i c f i e l d s e t u p b y t h e p e rma n e n t ma g n e t a nd
w i
1 1
ren d e r the re l e a s e l
a t c
h I nope ra t i ve pe rma nen t l y .
Wh en rep l a c i ng
a
m a g ne t i c r e l ea s e l a t c h , t h e co l I ( 804) l eads mus t
be connec ted t o t h e t e rm i na l b l ock o f t h e s t a t i c t r i p i n t h e
co r re c t p
o
l a r
i
t y r e l a t i on s h i p .
The
b l a c k l ea d of c o i I
{804)
mus t b e con n ec t ed to t e rm i n a l
7
(
n e ga t i v e
)
and t h e r e d l ead of co i l
(804)
connec t e d to t e rm i n a l
8
( pos i t i ve) of t h e s t a t i c t r i p dev i ce .
A c l ea ra nce o f . 0 6 s hou l d be ma i n t a i ned be tween t h e t r i p
a rm (80 5 )
a n d n u t
(
809)
w i t h the c
i
r
c
u i
t
b reake r o pen , s p r i ngs c h a r g e d a n d
t r
i p
a rm
(805) r e s e t by t he t r i p s h a f t . A d
j
u
s t
m
e n t i s made b y
pos i t i on i n g n u t
(809)
wh i
J e
ho l d i n g t r i p
r od
( 80 1 } .
Whe n the m
a
g n e t i
c
r e l e a s e l a t ch h a s been r ep l aced t h e c i r c u i t b rea ke r
s h ou l d b e g i ven
a
F UN CT I ON TEST as exp l a i ned p rev i ous l y t o en s u re
p rop e r ope ra t i on o f
a l l componen t s .
- 20 -
(
(
(