Time R Test; Cu Rrent Dete Ctor P I Ckup Setting - GE SBC23A Instructions Manual

S i nce mo st opera t i n g compa n i e s use d i ffe r e n t procedure s fo r i n s ta l l a t i o n tes ts, the
sect i o n un d r
ACCEPTANCE TESTS
pa rt of the i n s tal l a t i o n proce dure at the d i scre t i on of the user.
sug g e s ted tes ts a re a s fol l ows :

TIME R TEST

Te s t per t i m i n g t e s t a s expl a i ned i n sect i o n t i t l e d

CU RRENT DETE CTOR P I CKUP SETTING

Set up the te s t cur ren t ci rcu i t of F i gure 35.
Pl ace an osci l l o scope on t h e " A" card TP4 a s an i nd i ca t i o n of cur re n t d e tecto r
p i ckup. No te t h a t a " 0 " vol t s i g n a l d e n o te s d ropout, a n d a po s i t i v e D C s i g n a l
repre s e n t s curre n t d e tecto r p i ckup.
As a qu i ck ch eck on each o f the re l ay cal i bra t i on ma rks, pe r fo rm the fo l l o wi n g :
Pl ace a l l cur re n t tap bl ock sc rews i n the m i ddl e po s i t i on.
I A
I s
I c
3 Io
Pl ace bo th curre n t rheostat po i n te rs to the fi r s t cal i bra t i o n l i n e ( i .e., lX ra nge
ba se ) .
Appl y te s t current to each o f the fou r curre n t ci rcu i t s per Fi gure 35 a nd adjus t t h e
cur ren t l ev e l un t i l the " A " ca rd TP4 i nd i ca te s tha t t h e cur re n t d e tector h a s jus t
p i cked up. The curre n t l evel s s houl d be a s fol l ows fo r the four ci rcui ts :
RMS fo r the pha se ci rcu i ts, a nd
Ha v i n g sel ected t h e phase a nd re s i dua l curre n t d etec to r s e tt i n g s to be used on the
sys tem ( 1- lOA fo r
app ropr i a te ra n g e s e l ec t i on :
tap bl ock ra nge ( 4- lOA) .
RMS v a l ue o f curre n t t o the d es i re d curre n t- d etecto r p i ckup l e v e l exactl y.
adjus t t h e p h a s e r h eo s ta t unt i l th e cur ren t de tec to r jus t p i cks up.
curre n t d e tecto r p i ckup l e vel on t h e rema i n i n g two phases i s +5 % of t h e o r i g i na l
s e tt i n g. Lock t h e p h a s e rheostat a n d b e sure tha t t h e cur re n t-de tector s e tt i n g has
n o t d r i fted i n the i n t e r i m.
ca l i bra te the re s i dua l current de tecto r by s e tt i n g the te s t cur ren t to t h e de s i r ed
3 I o ope ra te l evel , wh i l e adjus t i ng the re s i dual r h e o s t a t un t i l the curren t d etecto r
just p i cks up. Lock the re s i dua l rheo s ta t, a nd check tha t t h e ope ra te l ev e l has n o t
changed.
GEK- 4546 4
co n ta i n s a l l n ece s s a ry tes ts wh i ch may be pe r fo rmed as
0.95 -1.0 5 A RMS for the re s i dua l ci rcu i t.
pha s e and 0.5 - 5 A
as an exampl e, a 6 A phase set t i n g s houl d use the th i rd
Set up t h e I A cur ren t ci rcui t o f F i gure 35, a nd s e t t h e
Arra nge t h e 3 I o curre n t c i rcu i t o f F i gure 3 5 a nd
ACCEPTANCE TESTS .
2 A
2 A
2A
lA
fo r re s i dua l ) s e t
26
The mi n i mum
1.9 - 2 .1A
the tap pl ugs to
S l owl y
Ch eck tha t the
the