For altitudes above 2000 m, please contact Danfoss Drives regarding PELV.
Below 1000 m altitude no de-rating is necessary but above 1000 m the ambient temperature or
the maximum output current should be decreased.
Decrease the output by 1% per 100 m altitude above 1000 m or reduce the max. ambient tem-
perature by 1 degree per 200 m
7.3.4. Derating for Running at Low Speeds
When a motor is connected to at frequency converter, it is necessary to check that the cooling of
the motor is adequate.
A problem may occur at low speeds in constant torque applications. Running continuously at low
speeds – below half the nominal motor speed – may require additional air cooling. Alternatively,
choose a larger motor (one size up).
7. Specifications VLT Micro Drive FC 51 Operating Instructions
34
MG.02.A2.02 - VLT
®
is a registered Danfoss trademark
7
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