8
Motor
Manual
ured insulation resistance is less than 10 MΩ at 25°C, the
winding must be oven dried. The nominal value is typically
100 MΩ. If the measured value is less than 2 MΩ, the insu-
lation resistance is not acceptable. When oven drying the
windings, set the oven temperature to approximately 85°C
for 10 to 18 hours, followed by 100°C for 7 to 9 hours. The
nominal insulation resistance drops by 50% for every 20°C
rise in motor temperature. Measuring equipment must al-
ways be calibrated at least every year. Note that drain plugs
or valves must be open during heating. After heating, make
sure the plugs are fitted again.
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