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FAULTS
Excessive
sparking
at
com-
mutator.
Noisy
generalor
operation.
POSSIBLE
CAUSES
Brushes
of poor
quatity.
Break
in rotor
winding.
Rotor unwelded
lrom commuta tor.
Oflset
commutator.
Loose
brush holder springs.
Worn
out brushes.
Mica protruding from commutator bars.
Rotor rubs against pole shoes.
REMEDIES
Replace
brushes, fitting original parts.
Replace
rotor.
If rotor
does
not
show any
gthe
r fault,
renew weldings.
Turn
commutator
and
remove
excess
mica.
Replace springs
or
resto
re
correct spring
load.
Replace
brushes.
Remove excess
mica.
Check if pole shoes are
correctly
secur-
ed to casing.
Rep lace
bearings.
93
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