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Ex ampl e:
Th e tw o amp ( 2 A) tap fo r a 1-to-1 2 I FC95 tim e-overcu rrent rel ay requ i res o n e m ovabl e
l ead i n p osition C and th e oth e r i n p osition L.
Th e I FC rel ays should op erate at th e tim es sh ow n i n th e publ ish ed tim e cu rve w ith i n
o r plus o r m i nu s th e t im e-d i al sett i n g t i m es 0. 01 0 seco n d (
wh i ch ever is g reate r. Fi gures 5 and 6 sh ow th e variou s tim e-cu rrent ch a ract eristics for th e
I FC rel ays. Th e setting of the tim e d i al determi nes the length of th e tim e requ i red to .cl ose
th e contacts for a g iven cu rrent. Th e h igh er th e time-d i al sett i n g th e l on g e r th e op e rat i n g
tim e.
The contacts a re just closed when the tim e d i al is set to z ero (0). Th e m ax imum tim e
sett i n g occu rs when the tim e-d ial i s set to 1 0 and th e d i sk h as to travel its m ax imum
d ista n ce t o close the co ntacts.
Reset
Th e u n it resets at 90% of the m i n imum cl osi ng cu rrent. Reset tim es a re p rop orti o n ate to
the tim e-d i al settings. Th e tim e requ i red to reset to th e numbe r 1 0 tim e- d i al p osit i o n
wh e n th e cu rrent i s redu ced t o z ero (0) is app rox im ately fou r seconds ( 4 sec.) f o r th e I FC95
rel ays.
H IGH-SE I SM IC IN ST ANT ANEOU S UN IT
The i nsta nta neou s u n it h as a 25 -to-1 ran g e w ith a tapp ed coil. Th e re a re h i gh a n d l ow
ran ges, sel ected b y m eans of a l i nk l ocated on th e top of th e supp o rt stru ctu re (see Figu re
1). Th e tim e-cu rrent curve for th e i nsta nta neou s u n it is sh ow n i n Figu re 9.
H IGH-SE I S M IC T ARGET AND SEA L - IN UN IT
Th e target a n d seal - i n u n it h as tw o tap sel ections, l ocated on th e front of th e u n it (see
F i gu re 1).
These r el ays, wh en not i n clud ed as a p a rt of a control p a n el, w ill b e sh ipp ed i n cartons
d esig n ed to p rotect th em agai nst dam ag e. Imm ediatel y up on receipt of a rel ay, ex am i ne
it for a n y d am ag e susta i ned i n tra nsit. I f d am age resulting from rou gh h a ndl i n g is evi de n t,
fil e a d am ag e cl a im at once w ith th e transp o rtation comp any a nd p romptl y n otify th e
nea rest G eneral El ectric Sal es Office.
Reason able ca re sh oul d b e ex e rcised i n u np a ck i ng the relay to p revent dam a g e to its p a rts
o r d i stu rb i ng of th e adjustm ents.
I f th e rel ays a re not to b e i nstall ed imm ed iatel y, th ey sh ould b e stored i n th e i r o ri g i n al
cartons i n a pl ace th at is free from moistu re, dust a n d m etall ic ch ip s.
coll ected on th e outsid e m ay fi nd its w ay i nside wh en th e cover i s rem oved a n d cause
troubl e in th e op e ration of th e rel ay.
GEK-49950
RECEIVING, HANDLING, AND STORAGE
9
±
Sett i n g x 0. 01 0 sec.),
Fore i g n m att e r
±
7%
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