Time-Overcurrent Unit - GE IACS3A Instructions Manual

s i gn i f i ca n t ly
wavef or ms.
Ther efor e, i n or der t o t est AC r el a ys pr oper l y i t i s essen t i a l t o
use a t est volt a ge a n d/or
pur i t y of t h e si n e wa ve (i .e. ,
expr essed a s a
r el a y usi n g t u n ed
elect r oma gnet s (such a s t i me-over cur r en t
a f f ect ed by n on -sinusoi da l wa ve f or ms.
T IME-OVERC URRENT UNIT
Rot a t e t h e t i me di a l slowly a n d ch eck,
ci r cu i t , t h a t t h e
set t i ng.
The poi n t at
r u n n i n g t h e st a t i ona r y
a djust i n g scr ew.
Wi t h t h e con t act s
shou l d be su ffi ci en t ga p bet ween t h e st a t i ona r y con t a ct br ush a n d i t s
met a l ba cki n g st r i p t o en su r e a ppr oxi ma t el y 1/3 2" wi pe.
The mi n i mu m
det er mi ned by t h e posi t i on of t h e t a p scr ew i n t h e t a p bl ock a t
t op of t h e r el a y.
When cha n g i ng t h e cur r en t set t i ng of t h e r ela y wh i le i n t h e case,
r emove t h e con n ect i on
seconda r y ci r cu i t .
for t h e desi r ed cu r r en t , a n d t h en r epla ce t h e conn ect i on plu g.
The p i cku p of t h e u n i t for a n y cu r r en t t a p set t i n g i s a djust ed by
means of a spring-adjusting
t ur ned by i n ser t i n g a
By t u r n in g t h e r i n g,
i n t o a gr eemen t
t h i s a dju st men t has been di st ur bed.
desi r ed set t i n g i n t er medi a t e bet ween
obt a i ned. The u n i t
fr om a n y t i me- di a l
t a p- pl u g set t i n g.
va l u e.
T i me Set t i ng
T h e set t i ng of t h e t i me di a l det er mi n es t h e l en g t h
u n i t r equ i r es
pr edet er mi n ed va lue.
set on Wh en
0.
ma xi mum a mou n t
t h e ma xi mu m t i me set t i ng.
The pr i ma r y a djust men t
made by mea n s
obt a i ned by movi ng t h e per ma nen t
GEK-34054
a ffect ed by t h e
cur r en t
f i n i t e number f or
cir cu it s,
con t a ct s ju st
wh i ch t h e con t a ct s
con t a ct
Th i s scr ew sh ou l d be hel d secur el y i n i t s suppor t .
just closi ng
cur r en t a t wh i ch
pl u g,
Next , scr ew
ring
scr ew dr i ver
t h e oper a t i n g cur r en t of t h e u n i t may be br ou gh t
wi t h t h e t a p set t i n g
is a djust ed at
posi t i on a t
Th e un i t r eset s a t
t o cl ose it s con t a ct s
The con t a c t s a r e just
t h e di a l i s
t o cl ose t h e con t a ct s;
for
of t h e t i me di a l .
a ppli ca t i on
wa vef or m t h a t
i t s f r eedom f r om ha r mon i cs)
any pa r t i cu la r
R L o r R C n et wor ks,
r ela ys)
by mea n s of a lamp i n t h e
cl ose a t t h e
ju st cl ose ca n
br u sh i n or
a t No. 0
t h e con t act
t o sh or t t h e
the t a p scr ews i n t o t h e t a p ma r ked
(See Figure
in the n ot ches a r oun d t h e edge.
employed,
Th i s a djust men t a lso per mi t s a n y
t h e va r i ou s t a p set t i n gs t o be
the fact or y t o cl ose i t s con t a ct s
a mi n i mu m cu r r en t
90% of
when t h e
cl osed when
set on 10, t h e di sk
t h er ef or e
t h e t i me of oper a t i on
However ,
ma gnet a l on g i t s suppor t i ng sh elf ;
12
of n on - s i n u s o i da l
i s si n u soi da l .
ca n n ot
r ela y; h owever ,
o r sa t u r a t i n g
wou ld be especi a ll y
zer o ( 0 ) t i me- dia l
be a dju st ed
ou t by mea n s of
t i me set t i n g,
wi l l ju st close
cu r r en t t r a n sfor mer
2). The ring may
i f for some r ea son ,
wi t h i n 5% of
t h e mi n i mu m cl osi n g
of t i me
cu r r en t r ea ch es
t h e di a l
mu st t r a vel
t h i s set t i n g
of t h e un i t
f ur t her a djust men t
Th e
be
a n y
by
i t s
t h er e
i s
t h e
b e
t he
t h e
a
i s
t h e
gi ves
i s
i s