The standard motors adopt IC411 (TEFC-totally enclosed fan cooling) method that in accordance with IEC 60034-6. For VFD applications, while motors operate lower than 60%~70% of rate frequency, the self ventilation is not adequate, an optional external blower should be ordered, For example:

    · While motor operating at low speed, the separately constant-speed fan is recommended to be used to guarantee the ventilation effect.

    ·While motor operating significantly higher than the synchronous speed, the separately fan is also recommended to be used.It is helpful to reduce the motor noise.

The fan is optional with power supply 220V/380V at 50Hz. Other options of power supply need a special request.