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TROUBLESHOOTING AND REPAIR |
BRUSH AND SLIP RING SERVICE PROCEDURE (Exciter / Auxiliary Power Alternator) (continued)
FIGURE F.3 – EXCITER COVER SCREW LOCATIONS
FIVE SCREWS
(TWO ON OTHER SIDE)
EXCITER COVER
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PROCEDURE
1.Open either, or both of the doors on the control panel end of the
WARNING: Secure the doors in the open position using the door restraint system. If the machine does not have a door restraint system, remove the doors or securely restrain them to prevent them from falling closed.
2.Remove the covers from the exciter / auxiliary power alternator by removing the screws securing it. See Figure F.3.
3.Examine brushes, slip rings, and brush holder.
•Brushes should be clean and free from oil or grease.
•The brushes should be of sufficient length and have adequate spring tension.
•Brushes should be making good, continuous contact with the slip rings, and should be riding near the center of the slip rings. (The brush holder bracket may need to be slightly bent to achieve acceptable alignment.)
(Generally, the brushes should be replaced if either brush has less than 1/4” remaining before it reach- es the end of its travel.)
4.If the slip rings are very dark in color, display evi- dence of excessive arcing, or have worn prema- turely, these may be signs of a grounded or shorted rotor. Perform the Exciter Rotor Resistance and
Ground Test.
