Allis-Chalmers BWX-6637-5, Инструкция

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2 .
AND TESTING
Ma i n tenance
Each s t a t i c
ove rcu r r e n t t r i p dev i ce I s
�dj us t ed ,
ca l i b ra ted , and
tes t e d
b e f o r e s h i pmen t and i s ready for
u
s
e
a
f t e r s e
l
e
c
t
i n g app rop r i a t e s
e
t t i n g s
nnd
l
o ck
i
ng
the
p o ten t i ome t e r s h a f t s .
Ma i n t e n a n ce
i
n
t h e us ua l s e n s e
o
f
c
l
ea
n
,
readj us t , l ub r i ca te , e t c .
I s
not
requ i red on s t a t i c
ove r c u r ren t t r i p
d
e
v i
c
e
s
.
The on l y ma i n t e nance t h a t
I s recommended i s
pe r i o
d
i
c ve r i f i ca t i on
t ha t
the dev i ce i s f un c t i on i n g .
Th i s may be s u pp l emen t ed �s
d
e
s i
r ed by check i ng the ca l i b ra t i on ,
I
n s
p
e c t
i o n for l oo s e
o r b ro ke n ex t e r na l w i r i ng . r e s tor i ng l o
s
t
ca l i ­
b ra t i on ,
e
t
c
.
Los t C a l i b ra t i on
Th e ca l i b ra t i on of
the
s ta t i c
ove rcu r ren t
t
r i p
dev i ce
depend s on the
k
n o b
s be i n g p rope r l y
o r i e n ted on t
he
i r
s ha f t s .
I f
t
h
e
knobs a re
f o
r c e d
by
n
e
g l
e
c t
i
n
g t o
l oo s e n
the s h a f t l ocks , c a
l
i
b r
a
t i
on
w i l l
be
l os t .
b u t
c a n r e
a
d i
l
y
b e res tored .
A
knob w i I I be I n
p rope r
c
a
l i
b r a
t
i o
n
i f ,
when t u rned
cou n t e r c l oc kw i s e
a s
f a r as i t
c a n
go , the p
o i
n
t
e
r
J i nes up p rec i s e l y w i t h
t h e r e d ca l i b r a t i on
d o t on
the d i a l .
Re f e r to
F i g u r e
7 B .
I f the a bove
c hec k
s hows
t he ca l i b ra t i on
t o be I n e r ro r , remove the
knob
by
l oos en i ng i t s
s e t s
c
r
e w and
s
l i p
p
i n
g
I t
off
t he
sha f t . Then be
s u r e
t h e s ha f t
l oc k I s l
o
o
s
ene
d
( s ee
F
i g
u
r
e
7 B ) a n d t u r n t he s h a f t coun t e r ­
c
l
oc k w i
s
e as
f
a r a s
i t
w i I I
go . Keep t he s ha f t I n tha t pos i t i on and
r
e p l ac e the knob
so
t
h
a
t
i t i s d i r e c t l y ove r the r e d
ca l i b ra t i on dot .
T i gh ten t h e
s e t s c rew
I n
t h e knob .
W i t h
t h e s h a f t l oc k
l
o o
s
e
n
e
d
, t h e knob
m
a
y
now be
t u r
n
e
d
t o
t h e s e l e c t e d
d i a l
p o
s
i t
i
o
n
,
t he s ha f t
l oc ked , a n d t h
e
dev i ce r e t u rned to s e r v i ce .
�t!..!l9.
T h e tes t i n g
of A l l i s -Cha l me r s s ta t i c
o v
e
r
c u r r
e
n
t t r i p dev i ce s I s
eas l
l y
ac comp l i s he d
u
n
d
e r
f i e l d con d i t i on s w i t h
a
m
i n i
mum
of equ i pme n t and
p
r e
p
a r a t
i
on
.
V a r i ous t e s ts
can be made , and i n
a
ma nne r
t h a t ma kes t h em
s
u i
t
a
b
l e for
u s e d u r i ng rout i ne ma i nt enance .
Ca l i b ra t i on
c a n n o t
n o
r ma
l
l y
be
d
o n
e
u n d e r f i e l d cond i t i ons .
T h e tes t s
t h a t
w i
I I
be d e s c r i bed
c a n
be done on
a
comp l e t e
b r e a k e r
a s s �nb l y l
o
c
a
t
e
d
i n t
h
e
d i s connec t pos i t i on i n
t h e
cub i c l e ,
o n t he
comp l e t e
b
r
e
a
k
e
r
on a
wo r k ta b l e , o r on
a s t
a
t i
c t r i p dev i ce con p
l e t e
l y
r emoved f rom
t
h
e
b r eake r . I t i s n o t
n eces s a ry
to remove perma n e n t
w i r i n g i n
or de
r
to m a k e
t es t s . T es
t
i
n
g can be done o n
a
b r e
a
k
e
r e
x
a
c t l y
as
i t i s u s ed i n n
o r m a
l
s
e
r v
i
c
e .
S i mp l e , r
e a
d
i l
y ava l ! ab l e
e
q u i p
me
n
t
I s u s ed I n t h e
t e
s
t i
n
g
of s t a t i c
ov e
r
c u r r e n
t
t
r
i
p dev i ces .
The f
o
l l
ow
i
n
g
i tems of equ i pmen t a re requ i r ed
f o r
pe r f o rm i n g t h e r ou t i ne FUNCT I ON Tes t .
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