8.9.6 Commutator faults
Table 8-6 Commutator faults
Symptoms of fault
↓ Beads of molten metal
↓ Generally severe bar blackening
↓ Some segments are blackened periodically
↓ Some segments are severely scorched
↓ Flat spots on commutator
↓ Grooves in circumferential direction
Possible causes of faults Remedial measures
Plant fault
X Poor alignment Align motor set
X Mechanical jolts Improve installation
Operating mode or operating error
X Continuous light-load duty (partial load) Change number of brushes and/or
material
X Temporary overload Correct current limit
X Overload at standstill Correct current limit/shorten stand‐
still time
Cooling fault
X Cooling air too damp Change air ducting
X X Cooling air chemically aggressive Change air ducting
X Cooling air contains too much dust Change air ducting, use an air filter
X Cooling-air flow rate too high (commutator tem‐
perature too low)
Restrict air ducting (if necessary,
change brush material)
Brush fault
X Incorrect or unsuitable brush material Change brush material
X Brushes not in neutral zone Correct setting
Component defect
X Interruption in armature winding Repair winding
X Faulty solder joint Resolder solder joint
X X Out-of-round commutator Rework commutator
X Conductive inclusions in segment slots Pocket mill segment insulation
Operation
8.9 Faults
SIMOTICS DC 1GG5
Operating Instructions 02/2016 79
To Next Page
Loading...
Need help?
General