PS S1.0 1700
001
Version no T-code
F-code Section C-code
Drive Motor
64
Service Manual 1997-07-15
TABLE #1 Drive Motor Troubleshooting
Indications, Causes. and Correction of Unsatisfactory Brush Performance
Indications Immediate Causes Primary Faults
Sparking Commutator surface condition
Overcommutation
Undercommutation
Too rapid reversal of current
Faulty machine adjustment
Mechanical fault in machine
Electrical fault in machine
Bad load condition
Poor equalized parallel
operation
Vibration
Chattering of brushes
Wrong brush grade
Fluctuating contact drop
1-2-3-43-44-45-46-49-59-60
7-12-31-33
7-12-30-32
7-12-30-32
8-9-11
6-14-15-16-17-18-19-20-21-28-
29
25-27-28-29-38-39-40-41-42
7-13-23-34
51-52
See “Chattering or noisy
brushes”
55-57-59
50
Etched or burned bands on
brush face
Overcommutation
Undercommutation
Too rapid reversal of current
7-12-31-33
7-12-30-32
7-12-30-32
Pitting of brush face Glowing
Embedded copper
See “Glowing at brush face”
See “Copper in brush face”
Rapid brush wear Commutator surface condition
Severe sparking
Imperfect contact with
commutator
Wrong brush grade
See specific surface fault in
evidence. Also see 50.
See “Sparking”
11-14-15-16-51-52
54-58
Glowing at brush face Embedded copper
Faulty machine adjustment
Severe load condition
Bad service condition
Wrong brush grade
See “Copper in brush face”
7-12
38-39-41-42
46-47
57-61-62
Copper in brush face Commutator surface condition
Bad service condition
Wrong brush grade
2-3
43-46-47-48-49
59-61
Flashover at brushes Machine condition
Bad load condition
Lack of attention
14-35
38-39-41-53
5-11
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