GEK-34054
These t e s t s a r e i n t en de d t o make s u r e t h a t 'the r el a ys have n ot
de vi a t ed fr om t heir or ig ina l s e t t i ng.
If devia t i ons are encou n t e r e d,
t h e r e l a y mus t be ret e s t e d a n d s e r vi ced a s de s cri be d i n t h i s manua l .
TIME-OVERCURRENT UNIT
1.
Pe r for m Pi ckup t e s t as des cribe d i n t he
INSTALLATION
s e ct i on for
t he t a p i n se rvice .
2.
Pe rfor m the T i me Te s t s a s de s cribed i n the
INSTALLATION
s e ct i on .
INSTANTANEOUS UNIT
1 .
Check t ha t the Ins t an t a neou s Un i t pi cks u p a t t he des i re d curren t
leve l, a s ou t li ned i n t he
ACCEPTANCE TESTS
sect i on .
TARGET AND SEAL-IN UNIT
1 .
C he ck t ha t the u n i t pi cks u p a t t he valu e s shown i n Tabl e XII.
2.
Check xha t t he unit s dr ops out a t
3 0%
or mor e of t a p va l ue .
CONTACT C LEANING
For clean i ng relay con t a ct s , a fle x i bl e burn i sh i ng t ool s h ou l d be
u s e d.
Th i s con s i s t s of a fle x i bl e s t ri p of me t a l wi t h a n e t ch
r oug hened s u rface,
re sembli ng
i n e ffect
a
supe r fi ne
fi l e .
T he
pol is h ing a ct i on i s s o de li ca t e t h a t n o s cr a t ched a r e l eft , ye t i s
will cl ean off any corr os i on t h orough l y and r api dl y.
It s flex i bi li t y
e n su re s the cle a n i ng of the a ct ua l poi n t s of con t a ct .
Do n ot u s e
kn ives , fi l e s , abra sive pa pe r or cl oth of a n y k i n d t o cl ean r e l a y
con t a ct s .
SYSTEM TEST
Although t h is In s t r uct ion Book i s pr ima ri l y wri t t en t o che ck a n d
s et th e IAC r e la y,
overall fun ct i onal t e s t s t o check t h e s ys t em
ope r a ti on
are
r ecommende d a t
i nt e rvals
bas e d on
the
cus t omer's
e xpe r ie n ce .
SERVICING
TIME-OVERCURRENT UNIT
If it i s found duri ng i ns ta l la t i on or periodic t e s t i ng t h a t t h e
t i me- ove rcurren t u n i t is ou t of limi t s , t h e u n it may be re ca libra t e d
a s fol lows :
Tes t s
The pi ckup of t he un i t for a n y cur r e n t t a p i s adju s t e d by mea n s
o f a s pr i ng-a djus t i ng ri ng .
The r i ng may be t u r ne d by i nse r t i ng a
s cr ew dr ive r i n the not ches a r ound t he edge.
By t u rn i ng t he ring ,
the ope r a t ing cu r r ent of the un i t may be boug ht int o agreeme n t wi t h
t he t a p se t t i ng employed i f, for some rea s on , t h i s a dju s t me n t h a s
be en di s t rubed.
Th i s adju s t ment a l s o pe r mi t s any de s ired s e t t ing
16
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