GEK-49848A
Fi g . 2 1 s hows a typi cal tel e phone rel ay type auxi l i a ry un i t used i n JBC rel ays
to control the t i me overcurrent un i t .
Th i s un i t i ns erts add i ti onal res i s tance i n
i ts o perati n g co i l c i rcui t a s i t pi cks up by o pen i n g i ts normal l y c l osed contact
whi ch i s acros s a ser i es res i stor ( s ee R4 i n F i gs . 7 and 9 ) .
Th i s al l ows fas t
pi ckup a n d d ro pout wi th a conti nuousl y rated auxi l i ary ci rcui t .
RECE I V ING, HANDLING AND STORAGE
These rel ays, when not i ncl uded as pa rt of a control panel , wi l l be s h i p ped i n
ca rton s d e s i gned to protect them a ga i n s t dama ge .
I mmed i atel y upon rece i pt o f a
rel ay, exam i n e i t for any dama ge sustai ned i n tran s i t .
I f i njury or dama ge
resul ti n g from rough handl i n g i s evi dent, fi l e a damage cl a i m a t once wi th the
trans porta ti on company and promptl y noti fy the nearest General El ectri c Sal es
O ffi ce .
Reasonabl e ca re s houl d be exerc i sed i n un packi n g the rel ay i n order that none
of the parts are i njured or the adjus tments d i sturbed .
I f the rel ays are not to be i ns tal l ed i mmed i atel y, they s houl d be s tored i n
the i r ori gi nal cartons i n a pl ace that i s free from moi s ture, dust and metal l i c
c h i ps . Fore i gn matter col l ected on the outs i de o f the ca se may fi nd i ts way i ns i de
when the cover i s removed a nd cause troubl e i n the o pera t i o n o f the rel a y .
ACCEPTANCE TESTS
I mmed i atel y upon rece i pt o f the rel ay an i ns pection and acce ptance test s houl d
be made to ensure that no dama ge ha s been susta i ned i n s h i pment and that the rel ay
cal i brati ons have not been d i sturbed .
I f the exami nati on or test i nd i cates that
readjus tment i s neces s ary, refer to the secti on on S ERV I C ING .
These tests may be performed as part o f the i nstal l a t i o n or acce ptance tests a t
the d i s cret i on of the user .
S i nce mos t o perat i n g compan i es use d i fferent procedures for acce ptance and
i nstal l ati on tes ts, the fol l ow i ng secti on i ncl udes al l appl i ca bl e tes ts that may be
per formed on these rel ays.
V I S UAL I NS P E CT I ON
C heck the namepl ate s tampi ng to make sure that the model number and rati n g o f
t h e rel ay a gree wi th the requi s i t i on .
Remove the rel ay from i ts ca s e and check that there a re no broken or cracked
mol ded parts or other s i gns of phys i cal dama ge and that al l screws are t i ght . C heck
that the s horti n g bars are i n the pro per l ocat i on ( s ) as s hown by the i nternal
connec ti ons d i a gram, Fi gs . 5 to 9 i ncl us i ve, and that the ma i n brus h i s pro perl y
formed to contact the s hort i n g ba r .
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