GEK-49950
T i me T est
*Set the relay at the nu mber 1 0 time-dial setting and the l owest ta p. Usi ng the test
con nection i n Figu re 1 1 a pply ten ( 1 0) ti mes tap cu rrent to the relay. T he relay o perati ng
time to close its contact is l isted i n Tab le X.
TABLE X
Relay
Hz
T i me (seconds)
Minimu m
Max i mu m
I FCGS
60
0.5 1 0
0.540
I FC95
5 0
0.5 65
0.640
H IGH -SE I SMIC IN STANTANEOU S UN IT
Mak e sure that the i nstantaneous-u n it l i nk is in the correct position for the range i n w h ich
it is to o perate. See the i nternal con nections diagram (Figu re 4) and con nect as ind icated
i n the test circu it of Figu re 12. W henever possib le use the hig her range, since the h i g h e r
range has a h i gher conti nu ous rati ng.
the
I nstantaneous U n it
T h e i nstantaneous u n it has an adjustab le core located at the top of the u nit as show n i n
Figu re 1. T o set the i nstantaneous u nit to a desi red picku p, loosen the l ock nut and adjust
t h e co re. Tu rn i n g the core cl ock w ise d ecreases t h e p i cku p; tu rn i n g t h e c o r e
cou ntercl ock w ise i ncreases the picku p. B ring u p th e cu rrent slowly u ntil t h e u nit picks u p.
It may b e necessary to repeat th is operation u ntil the desi red picku p valu e is obtai ned.
Once the d esi red picku p value is reached, tighten the l ock nut.
CAUTION:
Refer to Table VI for the continuous and one-second ratings of the
instantaneous unit. Do not exceed these ratings when applying current to
the instantane
o
us u nit
.
T he range of the i nstantaneous u n it (see Tab le V I) must be obtai n ed b etween a core
position of 1/ 8 of a tu rn of fu l l clockw ise and 2 0 tu rns cou nterclock w ise from the fu ll
clock w ise position. Do
not
leave the core i n the
full
clockw ise position.
H IGH -SE I SMIC TARGET AND SEAL-IN
T h e target and seal-in u n it has an operating coil tapped at 0.2 and 2.0 amperes. T he rel ay
is sh i p ped from the factory w ith the tap screw in the hig her ampere position (see Figu re 1).
T he tap screw is the screw hold ing the rig ht-hand stationary contact. To change the ta p
setting, fi rst remove one screw from the left-hand stationary contact and place it i n the
d esi red tap. N ext, remove the screw from the u ndesired ta p and p lace it on the l eft-h a nd
stationary contact w here the fi rst screw was removed. T h is procedu re is necessary to
prevent th e rig ht-hand stationary contact fr om getti ng out of adjustment. Screws sh ould
never
b e l eft i n b oth taps at the same time.
* Revised si nc e l ast issu e
12
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