34
･
N or m a l condit ion s of use
Th e n orm a l u se of a cont a ct or r ela y is t o close, m a int a in a n d open circu it s wh ich con t ain a n elect rom a gnet t h e m agn et ic
cir cuit of wh ich is open at t h e t im e wh en t h e coil cu rr en t is m ade a n d closed wh en t h e coil cu rr en t is br ok en.
･
Abn orm a l con dit ions of use
Abn or ma l condit ion s m a y ar ise when a n elect r om a gn et , a lt h ou gh en er gized, ha s failed to close.
A cont a ct or r ela y is r equir ed t o be a ble t o br eak t h e cu rr ent cor respondin g t o such abn orm a l con dit ions of u se.
(3) Mech a nica l endu r a nce t est
Wit h r espect t o it s r esist a nce t o m echa n ical wea r , a cont a ctor r ela y is ch a r act er ized by t h e n um ber of on-load oper at -
in g cycles, i.e. oper a t in g cycles wit h n o cu r r en t flowin g, wh ich ca n be m a de wit h ou t a n y m ech a n ica l fa ilu r e. Th e
st a nda r d nu m bers of n o-loa d opera t in g cycles, expressed in m illions, ar e given in t h e fir st colum n of Ta ble 26.
Ta ble 26.
Cla ss of m ech a n ica l en dur a n ce
(in m illions of n o-load
oper at in g cycles)
N u m ber of
n o-load oper a tin g cycles per h our
0.01
0.03
0.1
0.3
1
3
10
30
100
12
12
12
30
120
300
1200
3600
12000
(4) E lectr ica l endu r a nce t est
Th e test con dit ion of t h e electr ical endu ra n ce t est is t h e n or m a l con dit ions of use in Table 25 a n d t he m a xim u m
fr equen cies of on-loa d oper at in g cycles a r e given in t h e secon d colum n of Ta ble 26.
4-3 CON TACTOR RE LAY WITH TWIN CON TACT
Th e con t a ct or r ela y is usu a lly com posed of sin gle con t a ct . If t h is con t a ct is used a t 48V or h igh er u n der or din a r y
en vir onm ent a l condit ion s, it ca n be used a lm ost fr ee fr om con t a ct fa ilur e such a s u nsa t isfa ct or y cont a ct , et c.
Wh en it is in t ended to use t h e cont a ct or r ela y at low volt a ge an d cu r r en t , if t h e cont a ct or r ela y wit h twin con t act is
u sed, t h e con t a ct r elia bilit y will be im pr oved. As shown in F ig. 30, t h is con t act is divided in to two pa r ts, so t h at t h ey
h elp ea ch ot h er to pr even t occu r r en ce of con t act failu re a nd im pr ove t h e con t act r elia bilit y.
F ig. 29 Sin gle cont a ct
F ig. 30 Twin cont a ct
(St an dar d cont a ct )
Summary of Contents for H100C
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