Lenze MDxMA Three-phase AC motors ATEX 3D category - Manual (Page 11)

Electrical installation 3
11 BA 12.0031 EN 2.1
Danger!
If the characteristics indicated in the following diagram are used with
self-ventilation, only S2 - 10-min - operation is permissible below 20 Hz.
Motor frame size-dependent torque reduction with self-ventilation and operation with
frequency inverter
Motor frame size
Output frequency of frequency inverter
Fig. 4 Torque reduction with frequency inverter operation
The use of a separate fan allows for operation without restrictions concerning torque and
duty cycle.
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