Hitachi H100C, Technical Notes

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16
2-3-4 P ower Con sum pt ion
Wh en ca lcu lat in g t he in-boa rd temper at u r e r ise of t h e con t rol boar d, swit chboa r d, et c., t he power con sum pt ion of
t h e equ ipm en t s used m ust be consider ed. Th e power consum pt ion of t h e st a r t er a n d con t a ct or is given in Ta ble 12.
Ta ble 12. P ower con sumpt ion
P ower consu mpt ion (W) F r a m e Con t a ct
r esist a n ce
(m
Ω
)
con t act or st ar t er
Con dition of cur r ent
(Ra t ed oper a t ion a l
cu r r en t )
H 8C
～
12
H S8,H S10 3.8
～
8.1 6 10 12
H 20,H S20 3.6
～
5.2 10 14 20
H 25,H S25 2.9
～
4.3 13 16 26
H 35,H S35 1 .7
～
2.5 14 22 35
H 50,H S50 1 .6
～
2.2 23 30 50
65C 0.6
～
1.2 22 37 65
80C 0.6
～
1.0 29 44 80
100C 0.6
～
1.0 40 55 100
125C 0.6
～
1.0 57 72 125
150C 0.3
～
0.6 48 63 150
200C 0.2
～
0.5 57 61 180
250C 0.2
～
0.5 95 99 240
300C 0.2
～
0.4 118 122 300
400C 0.2
～
0.4 202 206 400
600C 0.2
～
0.4 446 450 600
Rem a rks: 1. The con t act r esis t an ce wa s m easu r ed bet ween t h e term in a ls of t he power sou rce a n d
t h e loa d sides a ft er th e 50 t h ousa n d cycle elect r ica l endu r an ce t est .
2. The power con sumpt ion of t h e con t a ct or r epresen ts t h e su m of power consum ption
of t h e cur r ent -flowin g section a n d t he coil, a nd t h e power con sum pt ion of t h e st a r ter
r epresen ts t h e sum of power consum pt ion of t h e cont a ct or a n d t h er m a l over load r ela y.
2-3-5 E ndu r a nce t o Over -cu rr en t
Wh en t h e squ irr el-ca ge m otor is dir ect-on-1in e s t ar t ed, a st ar t in g cur r ent of 5 t o 6 times t he r a ted cur r ent flows for 1
t o 2 seconds, a n d in som e of t h e loa d t ypes, su ch a cu rr en t m a y flow for lon ger t ha n 5 t o 6 secon ds. Th e t h erm al
over load r ela y wor ks a t over load a n d t h e cir cu it is broken , du rin g wh ich a n over-cur r ent exceedin g t he r a t ed cur r en t
flows. Accor din gly, it is necessa r y t o select t h e st a rt er , fu se, br eak er, et c. cor respon din g to t he loa d ch a r act er ist ics,
a n d also t o k n ow t he en dur a n ce to over -cu rr en t.
In F ig. 15, t h ey in d ica t e t h e a llow a ble t im es for w h ich t h e con t a ct or ca n be con t in u ou s ly u sed a lt h ou gh t h e
t em per a t u re r ise of cont a ct s is mor e t h a n t h e specified va lu e in st a nda r d. N ot e t h a t a ft er t h e la r ge cur r ent flows, a t im e
in t er val of m or e t h a n 2 h ou rs shou ld be pr ovided.
(N ot e: Th e endu r a nce t o over -cu r r en t does n ot depen d on power sour ce volt a ge.)