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 1GG6
Operating Instructions 02/2016
81
Summary of Contents for SIMOTICS DC 1GG6
Page 2: ...08 02 2016 10 27 V4 00 ...
Page 12: ...Table of contents SIMOTICS DC 1GG6 12 Operating Instructions 02 2016 ...
Page 14: ...Introduction 1 1 About these instructions SIMOTICS DC 1GG6 14 Operating Instructions 02 2016 ...
Page 70: ...Commissioning 7 8 Switch off SIMOTICS DC 1GG6 70 Operating Instructions 02 2016 ...
Page 82: ...Operation 8 9 Faults SIMOTICS DC 1GG6 82 Operating Instructions 02 2016 ...
Page 104: ...Maintenance 9 2 Repair SIMOTICS DC 1GG6 104 Operating Instructions 02 2016 ...
Page 138: ...Service and Support SIMOTICS DC 1GG6 138 Operating Instructions 02 2016 ...
Page 142: ...Quality documents SIMOTICS DC 1GG6 142 Operating Instructions 02 2016 ...
Page 153: ......