Hitachi H20-T Technical Notes page 37

4. CONTACTOR RE LAY
4-1 TYP E S OF CONTACTOR RE LAYS
Refer to ca t a logu e pa ge 38.
4-2 P E RFORMANCE
Th e perform a n ce of t h e con t act or r ela y is su bject ed to t ests a ccordin g t o t h e test in g con dit ion s specified by sta n dar ds
(IE C, J EM, et c.), a n d m ust sa t isfy th e valu es set fort h in th em t o secur e gu ar a nt ee. The t est in g conditions va r y wit h
t h e t ypes of loa ds, wh ich a re classified in t o ca t egor ies AC15 a n d DC11 a s given in Ta ble 24.
Kind of cu rr en t
Alt er n at in g cu rr en t
Th e m a jor t est it em s of t h e cont a ct or r ela y ar e a s follows, a n d in all of t h e test s t he specified va lues a re fu lly sa t isfied.
(1) Tem per a t ur e r ise t est
Sa m e as t h a t of cont a ctors (see pa ge 10).
(2) Ma k in g a nd br eak in g capa cit ies t est
Th e test con dit ion s of m ak in g ca pa cit y a nd br eak in g capa cit y test ar e t h e a bnorm a l conditions of u se sh own in
Ta ble 25.
Ta ble 25. Condit ion s for m ak in g a nd br eak in g cor r espon din g t o t he ut ilizat ion cat egories (IE C 60947-5-1)
Kind of Ca t egor y
cu r r en t
Alt er n at in g AC15
cu r r en t
Direct DC11
cu r r en t
Ie = r a ted oper at ion a l cur r en t
Ue = r a t ed oper a t ion a l volta ge
Ur = r ecover y volt a ge
T = t im e t o r each 95% of t h e st eady-st at e cu rr en t, in m illisecon ds,
0.95
P = UeIe = st ea dy-st a te power con su mpt ion , in wa t ts.
(1) Th e power -fa ct ors in dicat ed a re con ven tion a l va lu es a nd apply on ly t o th e t est cir cu it s wh ich simu la te t h e
electr ica l ch a r act er ist ics of coil cir cu it s. It sh ould be n oted t h a t, for t he circu it wit h power-fact or 0.4 (norm a l
con dit ions of use), sh un t r esist or s a re used in t h e t est cir cuit t o sim u lat e t h e da mpin g effect of t h e eddy
cu r r en t losses of th e a ct ua l elect r om a gn et .
(2) Th e va lu e "6 × P" r esu lts from a n em pir ical r elat ionsh ip wh ich is fou n d to r epr esen t m ost d.c. m a gn etic
loa ds t o a n upper lim it of P = 50W, viz. 6 × P = 300ms. Loa ds h a vin g power-consum pt ion gr eat er t ha n
50W ar e a ssum ed to consist of sm a ller loads in pa r a llel. Ther efor e, 300 ms is t o be a n u pper lim it , ir-
r espect ive of t he power con su mpt ion va lue.
Ta ble 24. Ut ilizat ion cat egories (IE C 60947-5-1)
Direct cur r en t
Norm a l conditions of u se
Mak e
I U cosφ
(1)
10Ie Ue 0.7
I U T
0.95
Ie Ue 6×P (2)
I = cu rr ent t o be m a de or br ok en
U = volt a ge befor e m ak e
Ca t egor y Typica l a pplica t ion s
AC15 Con t r ol of a .c. elect roma gn ets
DC11 Con t r ol of d.c. electr om a gn et s
Br ea k
I Ur cosφ
(1)
Ie Ue 0.4 11Ie
I Ur T
0.95
Ie Ue 6×P (2) 1.1Ie
33
Abn or ma l condit ion s of use
Mak e
I U cosφ
(1)
1.1Ue 0.7
I U T
0.95
1.1Ue 6×P (2) 1.1Ie
Br ea k
I Ur cosφ
(1)
11Ie 1.1Ue 0.7
I Ur T
0.95
1.1Ue 6×P (2)