Allis-Chalmers LA-1600, Инструкция

Страница: 84 / 100

-··
Func t i on
T e s t - P r
o
c
e
e d a
s
fo l l
ow s
:
Connec t t es t c i rc u i t a s
s h own i n F i g u re 7 F
Loos e n
s ha f t
J oc ks
S e t p i c k � u p knobs a t
' W '
S e t
i n s t a n t a neous
(
o r t ;a n s f e r
)
knob a t l OX
or
h
i
g h
e r
C l os e
B r e a k e r
Qu i c k l y
i n c r e
a
s
e
cu r r e n t t o 1 . 5
Amps
(3X
p
i c k
-
u p
)
a n d
h
o l d
O re <:J kc r
s hou l d
t r i p
i n app rox i ma t e l y
I O
t
o
45 s e conds
dep�nd i n g on
t h e
t i me
band
(
s e
e
cu r ren t - t i me c u r v e .
F i g u r e s
70 , 7F.)
Reduce
o r s h u t o
f f
c u r re n t .
R e pea t a s d e s i red
S e t i ns t a n t a neous (or
t
r
a
n
s f
e
r
)
knob a t SX
C l os e
B rea ker
Qu i c k l y i
n
c r
e
a s
e c u r re n t t o 2 . 5
Amps
B r e a ke r s
h
o
u
l
d
t r i p i
ns
t
a
n t
l
y
a t
2 . 5
Am
p s or
a
l i t t l e
J ess
R e
d
u c e o r
s h u t
o f f c u r r e n t
Repe a t as d es i 1 ed
Res tore
o
r
i
g i
na
l
s e
t
t
i
n g
s
a n
d
t
i
g
h
t e n
shaft J ocks
T
h
i s
f u
n
c
t
i
o
n
t e s t
w i l l
s how
t h a t the
t
i
me
d
e l a y c i rcu i t a n
d
t he s h o r t
t i me
c i r c u i t a re f u nc t i on i ng . Repea t a b i l i t y
s h
o u l
d b e
good , b u t
t h e
s pec i f i c va l ue o f t i me de l ay s hou l d n o t b e j ud ged
excep t i n t he b road
s e n s e .
Obv i ous l y . o t he r
p
a
r
a
m
e
t
e
r
s
can be
u
s
e d
for this
tes t - t h os e
d e s c r i bed w i l l
g i ve
a
r
e
e
s o
n a
b l y fa s t
t es t
w i t h m i n i mum
t e s t
powe r .
H i gh e r
c
u r r e n t s
a t t h e "A"
s e t t i n
g
w i
I I
g i ve fas t e r t r i p t i
m
e s
.
S e t t i n gs o t he r t ha n
' W '
r e
q
u
i
r e mo re cu r re n t t o ge t t h e des i r ed
m u l
t
i p l e s o f p i c k - u p
(e . g .
3
Amps at
"E" s et t i ng
i s
requ i red f o r
3X
p i c k -up} .
The
f u n c t i on
t es t may be
r
e p e
a
t
ed u s i n g t e rm i na l s 2 -4
a n d
3 -4
{Mode l
A I
a n d
D) ;
o r t e rm i na l
3-2
(Mode l
AG
and DG) .
I t i s n o t
r e commended
t o
t e s t t e rm i n a l s
4-2
on
the Mode l s AG ,
DG
s i nce t he g round de
t ec t
i
o
n
t rans f o rme r
c i r c u i t
h a s
a
v e r y
much
h i gh e r
i mpe
d
a n c
e
a n d I s beyond
t h e
capa b i l i t i es
o f
t he
u
s
ua
l l ow
powe r
t e s t
f a c i l i t i es .
I f
t he b r ea ke r f a i I s
t o t r i p or t
r
i
p
s
i P s t a n t l y a t 1 . 5
a m p e r e
s
,
i t I s
s u
g g
es t
e
d t h a t t h e
f
a
c t
o
r
y be con t a c t ed . O n l y
p
e r s on n
e
l
who
a r e
t
h
o
r o u
gh
l
y fam i l i a r w i t h
c
i
r
c
u
i
t s of
t h i s
t y pe s hou l d a t t e m p t t o
l oca t e
a n d c
o r r
e
c
t
t ro ub l e s .
T h e above t e s t
i s be l i eved
t o b e a d
e
q u a t e f o r t h e
maj or i t y o f
a
pp
l
i c
a
­
t i ons
of l ow
v
o l t
a
g
e c i r cu i t
b reakers . Howeve r ,
t hos e who r e q u i re
c l os e coord i n a t i on
w i th o t h e r
d e
v
i
c
es
and w i s h to c hec k ca l i b ra t i on
pe r i od i ca l l y ,
may
do
s o i
n
the f i e l d w i t h a r ea
s
o
n
a b l e d
e g
r
e
e
of
a c c u r
a
c
y
by
us i ng
s om e w
h
a t more e l a b o ra t e equ i pme n t and t e s t p r
o
cedu r es
.
F u r t h e r t e s t i n f o rma t i on i s ava i ! ab l e i n s
t
a
t
l
�
t
r i p ove r c u r r e n t t r i p
dev i ce I ns t ruc t i on
Book BWX -6678 - 1 .
- 1 9 -