GEK-49849
the c l utch pressure and, consequent l y, the current val ue whi ch wi l l cause the c l utch
to s
1
i p .
Note that too frequent or too
1
ong app
1
i cat i on of these currents wi
1 1
overhe at the coi l s .
I NSTANTANEOUS OVERCURRENT UNIT
The sect i on BEAR I NGS, under DI RECT I ONAL UNIT, a l so app l i es to the be ar i ngs of
the i nstantaneous overcurrent u n i t .
and Stator
The sect i on CUP AND STATOR, under D I RECT I ONAL UNIT, a l so appl i es to the cup and
stator of the i nstantaneous overcurrent u n i t .
Contact Adju stments
The contact gap may be adj usted by l oosen i ng s l i ght l y the screw at the front of
the contact support .
The screw shou l d be o n l y l oose enough to al l ow the cont act
barrel to rot ate i n i ts s l eeve .
The backstop screw fastened wi th a l ocknut shou l d hol d the movi n g contact arm
i n a neutral pos i t i on , i . e . , wi th the arm poi nt i ng d i rect l y forwar d .
Then by
rotat i ng the barrel , advance the stat i onary contact u nt i l i t j us t touches the movi ng
cont act . Next, back it away two and a hal f turns to obta i n approxi matel y
0. 080
i nch
g ap . L ast, t i ghten the screw whi ch secures the barre l .
The movi ng contact may be removed by
1
ooseni ng the screw whi ch secures i t to
the contact arm and s l i di ng i t from u n der the screw he ad .
CLUTCH ADJUSTMENT
The c l utch on the i nstantaneous overcurrent un i t can be adj usted by means of
the screw l ocated on the r i ght-hand s i de of the movi ng cont act arm .
If the l ocknut
i s l oosened and the screw turned i n, the current at whi ch the c l utch wi l l s l i p wi l l
be i ncreased .
P l ace the t ap p l ugs i n the l ower range t aps ( s er i es ) . Ho l d the d i rect i onal
u n i t contacts c l osed .
Adj ust the c l utch so that the current at whi ch the cup j ust
starts to s l i p fal l s wi thi n the l im i t s l i sted i n T abl e
14.
TABL E
14
DI RECT I ONALLY CONTROLLED I OC UNIT CLUTCH ADJUSTMENT
SUDDENLY APPL I ED CURRENT
SUDDENL Y APPL I ED CURRENT
P I CKUP RANGE
CLUTCH MUST NOT SL I P
CLUTCH MUST SL I P
2 - 16
12
15
10 - 80
44
58
Note that too frequent or too l ong of an app l 1 cat 1 on of these currents w1 l l
overheat the coi l s .
2 7
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