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8.9.6
Brush faults
Modify the arrangement of brush components or the brush material only with the
manufacturer's agreement.
Table 8-6
Brush faults
Symptoms of fault
↓
Knocked out or shattered brush edges
↓
High degree of brush wear
↓
High degree of wear despite good commutation
Possible causes of faults
Plant fault
X
Coupled motor out of balance
X
Poor alignment
X
Mechanical jolts
Cooling fault
X
X
X
Cooling air too dry
X
X
Silicone in the cooling air
X
Cooling air contains too much dust
X
Cooling-air flow rate too low (commutator tempera‐
ture too high)
Brush fault
X
X
Incorrect or unsuitable brush material
Component defect
X
X
Out-of-round commutator
X
X
X
Protruding segment insulation
X
Rotor imbalance
SIMOTICS DC 1HS5
Operating Instructions 02/2016
Remedial measures
Check coupling, rebalance system
Align motor set
Improve installation conditions
Change brush material
Remove silicone, clean machine and mounting
parts
Change air ducting, use an air filter
Improve cooling
Change brush material
Overrev commutator
Pocket mill segment insulation
Balance rotor
Operation
8.9 Faults
81
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