Installation; Operation - GE JBC51M Instructions Manual

LOCAT I ON
The l oca t i on s houl d be cl ean and d ry, free from dus t and exces s i ve v i bra t i on
and wel l l i ghted to fac i l i tate i nspecti on and tes t i n g .
MOUNT ING
The rel ay s houl d be mounted o n a vert i ca l surface .
d ri l l i n g d i a gram i s s hown i n F i g . 2 7 .
CONNEC T I ONS
The i nternal connecti on d i a grams for t he va r i ous rel ays are s hown i n F i gs . 5 to
9 . Typi cal wi ri n g d i a grams are s hown by F i gs . 1 0 and 1 1 .
i mportant for the correct operat i on o f Type JB C rel ays, t he rota t i on spec i f i ed i n
F i gs . 1 0 and 1 1 must be a d hered to .
a dequa tel y ground s the rel ay ca s e, i t i s recommended t ha t the ca s e be grounded
t h rough a mounti n g s tud o r screw wi t h a conductor not l es s than # 1 2 B&S ga ge copper
wi re o r i ts equi val ent .
Term i nal 1 2 o f JB C51 , JB C53, JB C77 rel ays s houl d be co nnected to the n e ga t i ve
s i de o f the D C bus .
INS P EC T I ON
At the t i me o f i ns ta l l at i on, t he rel a y s houl d be i ns pected for tarni s hed
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contacts, oose s crews, o r other i mperfec t i o n s .
be corrected i n the manner descri bed i n t he secti on o n S E RV I CING .
CAUTI ON
Every c i rcui t i n the drawout ca s e has an aux i l i ary brus h .
i mpo rtant o n current c i rcui ts and other c i rcui ts wi th s horti n g ba rs that the
auxiliary brus h be ben t high enough to en ga ge the connec t i n g pl ug o r tes t pl ug
before t he ma i n brus hes do .
opened . Refer t o F i g .
Before t he rel ay i s put i nto s e r v i ce, i t s houl d be gi ven a c heck to determ i n e
that factory a djus tments ha ve n o t been d i s turbed .
before the rel ay l ea ves t he factory .
be n eces s a ry to cha n ge t h i s setti n g i n order to open the t i me overcurren t un i t
co nta c ts . The fol l owi n g tests a re suggested:
TARGET AND S EAL- I N UNITS
1 . Make sure that the tap s crew i s i n the des i red tap .
2 . Perform pi ckup a n d d ropout tests a s outl i ned i n the ACCEPTANCE TEST secti on .
GEK- 49848A

INSTALLATION

Thi s w i l l prevent CT secondary c i rcui ts from bei n g
22 .

OPERATION

I f the s etti n g has not been c ha n ged, i t w i l l
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The outl i ne a n d pan el
S i n ce phas e s equence i s
U n l e s s mounted on a s teel pan el w h i c h
I f any troubl e i s found, i t s houl d
The t i me d i a l wi l l b e s e t at zero
I t i s espec i al l y