months as it is an easily worn part. If it is not replaced in time before it
wears out, it will damage the motor.
•
Do not keep the motor running idly for long periods of time. Any idle run-
ning of the motor should be avoided.
•
Removal of mud, sand and other debris should be done frequently.
•
Periodically use low pressure air to remove dust from the carbon brush
and the commutator. Periodically check the connection of the carbon
brush and the commutator.
Troubleshooting
27
Symptoms
Possible Causes
All copper plates turn black.
The pressure of brush is incorrect.
The commutating copper turns black in a
certain order and in groups.
Short circuit between the commutating copper and the arma-
ture coil; poor welding or disconnection between the commu-
tating copper and the armature coil.
The commutating copper turns black
randomly.
The central line of the commutator deviates or its surface is not
round and smooth.
The brush wears out, changes colors and
breaks.
The motor vibrates; the clearance between the brush and
its holder is too big; the clearance between the brush and
commutator is too big; the mica between different commutator
extrudes; the brush is made with wrong materials; the brush is
wrong in type.
Sparks.
The motor is over-loaded; the commutator is not clean, round
or smooth; mica or some commutator extrude; the brush is
not ground properly; the brush is the wrong type; the brush is
jammed; the brush holder is loose or vibrating; the polarity and
sequence of magnetic poles is wrong.
The brush and its wires get hot.
Sparks from the brush; poor contact between brush and soft
wires; small section area of soft wires.
The surface of the commutator is not
smooth.
The surface of the commutator is not smooth.
Controller Maintenance
CAUTION:
Only qualified electrician should perform maintenance on the control-
ler.
WARNING:
There are no spare parts available inside the controller. No attempt
should be made to open, repair, or otherwise modify the controller. Doing so may
damage the controller and will void the warranty.
