GEK-49849
M i dd l e U n i t
1.
The d i sk s h aft end play shou l d be 0. 005-0. 015 i nch.
2.
The d i sk s hou l d be centered i n the ai r gaps of both the e l ectromagnet and drag
magnet.
3.
Both ai r gaps shou l d be free of forei gn matter.
4.
The d i sk shou l d rotate free l y and shou l d return by i t sel f to the reset
pos i t i on.
5.
The mov i ng contact shou l d just touch the stat i onary contact when the t i me d i a l
i s at t h e zero t ime d i al pos i t i on.
B ottom U ni t
1.
The rotat i ng shaft end p l ay s hou l d be 0. 015-0. 020 i nch.
2.
The cont act gap s hou l d be 0. 015-0. 025 i nch on the l ow gr ad i ent front contact.
3.
The front cont act shou l d c l ose approx i mate l y 0. 005 to 0. 010 i nch before the
rear contacts.
and Seal - i n U n i ts/ I n s t antaneous U n i t
1.
The armature and contacts shou l d move freel y when operated by h and.
2.
Both contacts shou l d make at approx i matel y the s ame t i me.
3.
The t arget shou l d l atch i nto v i ew jus t as the contacts make and shou l d u n l atch
when the target r e l e ase button i s operated.
4 .
The contacts shou l d h ave approxi matel y 0.020 i nch wi pe.
DRAWOUT
GENERAL
S i n ce al l drawout rel ays i n servi ce operate i n thei r cases, i t i s recommended
that they be tested i n thei r c as es or an equ i val ent s tee l c ase.
In t h i s way, any
m agneti c effects of the enc l osure wi l l be accuratel y dupl i cated dur i ng tes t i ng. A
rel ay may be tested wi thout remov i ng i t from the panel by us i ng two 12XLA13A test
p l ugs .
Thi s p l ug makes connect i on s on l y w i t h the rel ay and does not d i sturb any
short i ng bars i n the c ase. The 12XLA12A test p l ug may a l so be used. A l though th i s
test p l ug al l ows greater test i ng f l exi bi l i ty, i t requ i res CT short i ng jumpers and
the exerci se of gre ater care, s i nee connect i ons are made to both the re
1
ay and the
external
circu
it
ry
.
POWER
GENERAL
A l l a l ternat i ng current operated dev i ces are affected by frequency. S i nce non
s i n usoi dal waveforms can be anal yzed as a fundamental frequency p l us harmon i cs of
the fundamental frequency, i t fol l ows that a l ternat i ng current devi ces ( re l ays ) w i l l
be affected by the app l i ed waveform.
Therefore, i n order to proper l y test a l ternat i ng current rel ays, i t i s
essent i al to use a s i ne wave of current and/or vol t age. The pur i ty of the s i ne wave
( i . e . , i ts freedom from h armon i cs ) cannot be expressed as a f i n i te number for any
part i cu l ar rel ay; however, any rel ay us i ng tuned c i rcu i ts, R-L or RC networks, or
s aturat i ng el ectromagnets ( su ch as t i me overcurrent rel ays ) i s affected by non
s i n usoi dal waveforms.
17
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