•'
Fun c t i on Tes t -
Proceed as
fo l l ows :
Connec t tes t c i rc u i t a s s hown
I n
F
i
g
u
r
e
7 F
Loosen
s ha f t
l ocks
S e t
p I c k-up knobs
a t
1 1A1 1
Set i ns tantaneous
(or
t
r
a
n
s
f
e
r
)
knob
a t l OX or h i gher
C l os e B reaker
Qu i c k l y i nc reas e
c
u r
r
e
n
t
to
1 . 5
Amps
( 3X
p i c k-up
)
a
n
d
ho l d
B reake r s hou l d t r
i
•> i n
approx i ma te l y
1 0
to
45 seconds
depend i ng on
t
h
e
t i me band
( s ee
c
u
r
r
e
n t
-
t i
m
e
c u r ve .
F i gu res 7 0 .
7E)
Red uce o r s h u t off c u r ren t .
Repea t
as des i red
Set
i ns t an t aneous
(
o
r
t
r
a n
s
f
e
r
)
knob at
SX
C l os e
B reaker
Q
u
i
c
k
l y
i ncrease curren t to
2.5
�nps
B re a ke r shou l d
t r i p
i ns ta n t l y
a t 2 . 5 Amps
or a
l i tt l e
l e s 5
Reduce o r s h u t of f cu r rent
Repeat a s
d es i red
Res tore or i g i na l s e t t i ngs
a nd
t i ghten
s ha f t
l ocks
Th i s f unct i on
tes t
w i l l s how
t h a t the
t i me
de l ay
c
i
r
c
u
i
t
a n d
t he
s
h
o
r
t
t i me c i rc u i t a re
f unc t i on i ng .
Repeatab i l i t y s h ou l d be
good , b u t
the
s pa� i f i c va l ue of t i me de l ay s hou l d not
be 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 parame t e r s
can
be
used
for
t h i s
tes t - t hos e
des c r i bed w i l l
g i
v
e
a
reasonab l y fas t t es t w i t h m i n i mum tes t powe r .
H i ghe r currents a t
t h e "A"
s e t t i ng
w i
I I
g i ve fas t e r t r i p t i mes .
S e t t i ngs other t han 1 1A1 1 re
q
u
i
r
e more cu r rent to
get
the des i red
mu l t i p l es of p i ck-up
(e . g .
3
Amps
a t 1 1£ 1 1
s e t t i ng
i s
requ i red f o r
3X
p i ck-up
)
.
The func t i on tes t may
be
repeated us i ng t
e
r
m
i na
l
s
2 -�·
and
3-4
(Mode l
A l and
0) ;
or
t
e r
m
i n
a
l
3 -2
(
Hode l
AG
and
DG) .
i t
I s
n
o
t recommended
to
t es t
t e rm i na l s
4-2
on the
Mode l s
AG , OG
s
i
n
c
e the g
r
o
u
n
d
de tec t i on
t ran s fo rme r
c i rc u i t
has
a
very
much h i ghe r
I
m
p
ed
a
n
c
e
and
i s b eyond
t h e
capa b i l i t i es
o f
t
he
us ua l l ow p
ow
e
r
tes t
f a c l l l t l es .
I f
t h e
b
r
e
a k
e
r
f a i l s
t o t r i p
or t r i ps i ns ta n t l y a t
1 . 5
a
mp
e
r
e
s
,
I t
i s
s ugges ted
that the
f a c t o ry be
con tacted . On l y pe r s onne l
who a re
tho rough l y
fam i l i a r w i th
c i rcu i t s
of th i s
type
s
h
o
u
l
d
a t tempt t o
l oca te and
co r rec t
t ro ub l es .
The
above tes t I s
be l i eved
to
be
a
d
eq
u
a
t
e for the maj or i ty
of
a pp l i ca
t i ons
of
l ow
vo l t age
c i rc u i t
b
r
e
a
k
e
r
s
.
However , thos e who r
e
qu i
r
e
c l ose coord i na t i on wi t h other dev i ces
and
w i s h to
check 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 re
a
s
o
n
a
b l
e
deg ree
of
· ac c u racy
by
u
s
i
n
g
s omewha t
more e l a b o r a t e
equ i pmen t and
tes t
p rocedures .
F u r the r tes t i n
f
o
r
m
a
t
i
o
n
i s
a
v
a
i
! ab l e
i n s ta t i c t r i p over c u r ren t t r i p
dev i ce I ns t ruct i on Book
BWX-6678 - 1 .
- 1 9 -
Summary of Contents for LA-1600
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