Z. Insufficient voltage on self-exciting machine
  Possible Causes Remedies
2 Vibration from external causes, i.e. forge hammer Remove causes - mount machine on shock absorbers
3 Vibration from internal causes, i.e. out of balance Balance armature and check for bearing wear
10 Oil or dirt on common commutator or slipring Clean
12 Resistance between brush and arm not uniform Clean and tighten connections
14 Mica proud Recess mica or use a more abrasive grade
17 Solderings interrupted Resolder tags
18 Commutator or slipring excentric Turning and grinding at near rated speed
20 Spring pressure too low Adjust to brush grade
23 Imperfect brush bedding Rebed brushes carefully and clean
24 Brush flexible connection faulty Replace by a new brush with good connection
25 Brush flexible too short or too stiff Use brush with flexible of correct length and flexibility
29 Radial brush holders not in correct position Adjust holder to radial position, distance from commutator 2-3mm
30 Reaction type holder mounted trailing Reverse holders or direction of rotation
31 Brush sticking Check brush size - remove burns and dust
33 Terminal connections loose or dirty Clean, tighten screws
35 Incorrect position of holder Adjust holder to correct position
36 Unequal alignment of holders Correct spacing and alignment of holders
40 Gas or acid fumes in atmosphere Arrange for clean air cooling
41 Long periods at low or steady load Change brush grade - ask for our recommendation

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Unit 1, 120 Shad Road,
Wadeville Ext2
South Africa

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P.O. Box 673
South Africa

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