WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento página 88

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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):
Limit value for rated voltage
up to 1.1 kV (MΩ)
Up to 5
5 to 100
100 to 500
Higher than 500
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.
88 Manual of Electric Motors
Table 5.5 – Evaluation of the insulation system
Limit value for rated voltage
above 1.1 kV (MΩ)
Up to 100
100 to 500
Higher than 500
Higher than 1000
Situation
Dangerous. The motor can not
be operated in this condition
Regular
Good
Excellent