Lamb LABA-WDMO-0814 Betriebsanleitung Seite 24

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The motor insulation condition must be evaluated by comparing the measured value with the values
indicated in Table 5.5 (corrected to 40 °C):
Table 5.5 - Evaluation of the insulation system
Limit value for rated voltage Limit value for rated voltage
Situation
up to 1.1 kV (MΩ) above 1.1 kV (MΩ)
Dangerous. The motor can not
Up to 5 Up to 100
be operated in this condition
5 to 100 100 to 500 Regular
100 to 500 Higher than 500 Good
Higher than 500 Higher than 1000 Excellent
The values indicated in the table should be considered only as reference values. It is advisable to log all
measured values to provide a quick and easy overview on the machine insulation resistance.
If the insulation resistance is low, moisture may be present in the stator windings. In this case the motor
should be removed and transported to a WEG authorized Service Center for proper evaluation and repair
(This service is not covered by the warranty). To improve the insulation resistance through the drying
process, see section 8.4.
Manual of Electric Motors 77