Vibr A T Ion -Pr Oof Ch A R A Ct Er Ist Ics ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・17 - Hitachi H20-T Technical Notes

Magnetic starters and contactors
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F ig. 15 E ndu r a nce t o over-cur r ent
2-3-6 Vibr a t ion -pr oof Ch a r act er ist ics
Wh en a st ron g vibr a t ion is a pplied t o t he m ou nt in g boa rd, t h e con ta cts of t he con ta ctor a n d t he t h erm a l over load
r ela y m a y ca use ma lfu nct ion . Th er efor e, t r y t o pr event vibr a t ion to t h e mou n t in g boar d by a ll m ea n s.
Th e m a lfu n ction lim its of st a rt er, cont a ct or a n d th erm a l over load rela y a r e over 2 (g).
Vibr a t ion acceler at ion (g) = 0.002 × (F requ en cy (H z))
× Double a mplit u de (mm )
2
17

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