44
P er iodica l inspect ion it em
Con t en t s of inspection
･
Wh en t he con t act is bla ck en ed:
E ven if som ewh a t black en ed, n o t rou ble occu rs;
h owever , if t h e blacken in g is a bn or m a l, th er e m a y
be a pr oblem a bout t h e a tm ospher e, so t h at
in vestiga t ion a nd cou nt erm easu res sh ou ld be
ca r r ied ou t.
･
F or eign m a t t ers a dher ed t o t h e cont a ct , su ch
a s dust, et c. sh ould be wiped off wit h a clot h
dipped in a lcoh ol. Use of a n or ga n ic solven t such
a s t r ich lor oet h ylen e m a y ca u se con t act failu re.
･
Ch eck cont a ct over t r a vel. Wh en over t r a vel is
lit t le, r eplace t h e cont a ct s.
7. Check of cont a ct in g fa ce of
elect r om a gn et (Wh en t her e is a n
a bn or m a lit y refer r in g to pa r a. 5.)
･
Ch eck when t h er e is a n a bn or m alit y such a s
bea t , et c.
･
Ch eck whet h er a for eign su bst a nce such a s dust ,
et c. is a dher ed t o t h e con t a ct in g face. When a
for eign s u bst a nce is adh er ed t o t he fa ce, wipe
it off wit h a clot h.
･
Ch eck whet h er t h ere is a n y r ust . If it is foun d,
r emove it by r ubbin g wit h dr y clot h. U se of
sa n dpa per or file will r esu lt in pr odu cin g beat s.
8. Check of volta ge applied to coil
･
Ch eck whet h er t h e volt a ge is t oo h igh or t oo low.
Th e volt a ge sh ou ld be a djusted so t h a t it at t a ins
t h e r a t ed volt a ge aft er oper a t ion . Tak e car e t h a t
t h e volt a ge wh en closin g does not becom e less
t h a n 85% of t h e r at ed volt a ge. Un suit a ble volt a ge
of t h e oper at in g coil will ca use va rious t r ou bles,
so t h at specia l car e shou ld be ta ken t o en su r e
su it able volta ge .
9. Measu r emen t of insu lat ion
r esist a n ce
･
Mea sur e in sula t ion r esist a n ce wit h t h e 500V
in su lat ion r esist a n ce m et er , a nd if it s m eas ur ed
va lu e is less t ha n 1M
Ω
, imm ediat ely r epla ce
wit h n ew on e. If t h e insu lat ion r esist a nce is less
t h a n 5M
Ω
but m ore t h a n 1M
Ω
, it ca n be
t em pora r ily u sed; however, r epla ce as soon as
possible.
6-2-2 Repla cemen t of Cont a ct s of Cont a ct or
Th e elect r ical en du ra n ce of t h e cont a ct or depends m a in ly u pon t h e wea r of t h e cont a ct s a nd det er ior a t ed insu la t ion
of ar c su ppr essin g ch a mber. Con t a ct s wear is classified int o t he m odes given in Ta ble 33, a ccor din g t o which t h e
con dit ions r equir in g cont a ct s replacem en t a re det erm in ed.
Summary of Contents for H100C
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