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Son/all*
CentrifugesDrive
System
CircuitTable
4-7.
Troubleshooting
Chart,
Drive
Motor
BrushesPROBLEM:
Brushes
wear
rapidlyor
are
noisy.Do
brushes
wear
rapidly7YESNODo
brushes
chatter
or emita
hissing
noise?YES-^\
Check
and
adjustbrush
spring
tension.Is
problem
solved?NOCheck
for rough
commutator.Resurface
commutator
andundercut
mica.Is
high
mica
evident?YESNOAre
brushes
sparking?NOYESIs
commutator
in bad
|
YEScondition?NOProblem
solved.Resurface
commutator
andreset
brushes.Is
commutator
eccentric
|
YESor
rough?NOCheck
brush
spring.
Is it
|
YESbroken
or sluggish
acting?NOCheck
brushes.
Are
brushestoo
short
or
oil-soaked?YESNOCheck
commutator.
Are
thereany
metallic
particles
betweensegments?YESNOGrind
and true
commutatorand
undercut
mica.Replace
spring
and
adjustpressure.
See
para.
6-7,
6-8.Replace
brushes.Remove
metallic
particles.Check
adjacent
commutator
risersand
armature
for short
circuit.Is
there
a short
circuit?YESReplace
commutator
risers
orarmature
as
necessary.8/79RCS/1464-15
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