Manual for Induction Motors and Generators
Maintenance - 77
3BFP 000 050 R0101 REV E
Figure 7-4 Measuring the insulation resistance of a roller bearing
***Following chapter for bearing type: Roller bearing
7.5.4.2 Cleanliness of bearing insulation
The bearing insulations are installed in the end shields. To avoid decrease of the insulation
resistance caused by foreign agents (salt, dirt) building up on the insulation surface, the
cleanliness of the bearing insulation and the end shield surfaces around it should be checked
regularly and cleaned if necessary. See Figure 7-5 Bearing insulation and end shield surfaces
for areas that should be checked regularly and kept clean. The areas are marked with a circle and
the bearing insulation is pointed out by an arrow in the figure.
Figure 7-5 Bearing insulation and end shield surfaces
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