Hitachi H20-T Technical Notes page 52

Th er e is a ca se of ph a se fa ilu r e. In vest iga t e t h e
ca u se a n d r epla ce t h e fu se wit h one wit h a cor r ect
ca pa cit y.
In vest iga t e t h e ca pa cit y of power sou r ce, t a p volt a ge
a n d t h ickn ess a n d len gt h of wir e. Con su lt wit h
power com pa n y, ou r com pa n y's a gen t , sa les st or e,
a n d ser vice st a t ion a bou t t h e t r ou bles.
In vest iga t e t h e ca u se, r em ove it a n d a ga in t u r n
on power.
Disa s sem ble t h e con t a ct or, r em ove for eign su b-
st a n ces, or r epla ce defect ive pa r t s.
Repla ce pa r t s a r ou n d t h e con t a ct . (fixed, movin g
con t a ct s a n d con t a ct spr in g)
Clea n t h e con t a ct in g fa ce of iron cor e wit h clot h .
Th e m ech a n ica l en du r a n ce h a s r ea ch ed it s lim it .
Repla ce ir on cor e.
Repla ce pa r t s. (r et u r n spr in g)
Repla ce pa r t s. (con t a ct spr in g)
P la ce t h e st a r t er in du st -pr oof or a n t i-cor r osion box.
Clea n t h e con t a ct in g fa ce of iron cor e wit h clot h .
Repla ce pa r t s. (fixed a n d m ovin g iron cor es)
Repla ce pa r t s. (coil)
Repla ce pa r t s. (coil)
Clea n it wit h clot h .
Melt in g of power sou r ce fu se
Dr op of power sou r ce volt a ge.
P ower sou r ce volt a ge is t oo
h igh .
Oper a t ion of fu se-fr ee br ea ker
F a ilu r e of slidin g (m ovin g)
pa r t
Melt in g of con t a ct
Adh er en ce of t a cky su bst a n ces
t o t h e con t a ct in g fa ce of ir on
cor e
Wea r of t h e con t a ct in g fa ce of
ir on cor e
Da m a ge of r et u r n spr in g
Defect ive con t a ct Spr in g
Du st or r u st on t h e con t a ct in g
fa ce of ir on cor e
Difect ive sh a din g coil
Wir e-br ea kin g of coil
Ra r e sh or t of coil
Adh er en ce of oil to con t a ct