.�U.!J..Q,tl_:
A LL S E LE CT I ON KNOBS ARE EQU I PP E D W I TH
S
H
A
FT
LOC KS
T O
E NS URC: PERMAN E N C E
OF S ETT I NG S .
T U R N I NG
A
KNO B O N
A
LOCKE D
S
H
A
FT
�/ I L L C AU S E LOS S
OF
CA L l BRAT I
ON .
T H E
S E CT I ON O N
MA
I
N
T
E
N
A
N
C
E DES CR I B E S
H OW T O REST ORE
CALIBRAT I ON
I F
TH I S
S H O U L D H A P P E N .
S
e
1
e c.
The
t h ree
knobs
a r r a n ged
v e r t i ca l l y
on t h e
r
i g
h
t
hand s i de
of t h e
s t
a
t
i
c
t
r
i
p
dev i ce
(
F
i
g u
r
e
7)
a re
f o r
s e l e c t i on
o f t h e
c
u
r
r
e
n
t
a t
wh i ch �
t i me de l a y t r i pp i n g
ope ra t i on
w l
1 I
s t a r t .
Th i s
I s
t
h
e
p l c k • u p
c u r ren t .
O n e knob
I s
p r ov i d ed
f o r
each
pha s e (exce p t
Mode l s AG , DG ,
where
the
m i d d l e
knob
i s
u s ed t o
s e l ec t
g r ound
c
u
r
re
n
t
p i c k - u p) .
The
p i c k - u p s e l ec: t i on
d i
a
l
s
a re m.3 r ked w i t h
t h e
l
e
t
t
e
r
s
"A"
t h rough
1 1£" . The
p i ck-up c.: u r r e n t
def i ned by
each
l e t t e r
Is
l i s ted
on
the
c i rcu
i
t
b re a ke r
ra t i n g
p l a te ( F i g u r e
7A) .
Th i s i s the m i n i mum
pr i ma r y
c i r cu i t
c
u r r
e
n t
wh i ch
w
i
l
l
ca u s e t h e
c
i
r
c
u
i t
b re a ke r t o
open .
A
c
i r
c
u
i
t
b rea ke r
has
a
r
a
t
i
n
g
p l a te
as shown
I n
F i g u r e
7A .
The
p
i
c
k
-
u
p
s e t t i ngs
a re
at
po i n t
"A" .
The refo re ,
t
h
e
c l rcu i t w i l l
c a r ry
u p
to
500
Amps
w i t hout
t
r
i p
p
i
n
g
the c i r c u i t
b reake r .
Above 500
Amps
a
t
r
i
p
ope r a t i on
w i
l
l
occu r .
Th e p i ck- u p
s e l ec t i on
i s
con t i nuous
and
may
be s e t
be tween
ma r
k
s
I f
des i red .
U
s
u
a
l p r a c t i ce
i s
t
o
s e t
a l l
p i c k- u p
knobs
a t t h e s ame ·
ma r k ,
b u t
t
h
i
s
i s n
o
t
neces s a ry
a nd d i f f e r e n t
p
h
a
s
e
s
can
h
a
v
e
d i f f e ren t
p i c k - u p
s e t t i ngs .
The
r
a
t i n
g
of
t h e
c i rcu i t b rea ke r d e pe n d s
s o l e l y
on the p
r
i
m
a
r
y
c u r ren t
t r a n s f o rme rs s e l e c t ed
f o r
t h e
app l i ca t i on ,
a n d
i s
l
i
m
i
t
e
d
on l y
by
the
c i rcu i t
b reake r f rame s i ze .
The
r
a
t
i
n
g
of
a
c i rc u i t
b reake r may
be
cha n ged
i f
d es i r ed
me re l y
by r e p l a c i n g
t h e c
u
r
r
en
t
t rans f o rme rs a
n
d
the
b re a ke r r a t i ng
p l a t e .
N o t h i n g
changed
on
the
� ta t i c
t r i p
d ev i ce
o r
o
t
h
e
r
b re a ke r
compone n t s .
F i g u re
7A
s hows
b r e a ke r
r a t i n gs
ava i L3 b l e
w i th va r i ous
c
u
r r
en
t
t ra n s f o nre 1· s .
The
b rea ke r r e p r e s e n ted by
t h e
ra t i ng p l a t e
I n
F i g u r e
7A
i s
changed to
have
1 60 0
max i mum
rated
Amps
(
t h u s
A u
Boo .
B
u
1 00 0 ,
C
a
1 200 ,
D
•
1 400 ,
E
�
1 600) .
The
p i c k-up
s e t t i ngs
a r e
s t i l l on
1 1A 1 1 •
The
c i r cu i t
w i l l
now
ca r ry
u p
to
Boo
Amps
and
w i
I I
t r i p
o n
a n y th i n g
a bove
Boo
Am p s I n
the
p r i ma ry
c i r cu i t .
- 1 3 -
Summary of Contents for LA-1600
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