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Appendix B Technical data
B.1 What this chapter contains
This chapter describes the technical data of the VFD and its compliance to CE and other quality
certification systems.
B.2 Derated application
B.2.1 Capacity
Choose a VFD based on the rated current and power of the motor. To endure the rated power of the
motor, the rated output current of the VFD must be larger or equal to the rated current of the motor.
The rated power of the VFD must be higher or equal to that of the motor.
Note:
1. The maximum allowable shaft power of the motor is limited to 1.5 times the rated power of the
motor. If the limit is exceeded, the VFD automatically restricts the torque and current of the motor.
This function effectively protects the input shaft against overload.
2. The rated capacity is the capacity at the ambient temperature of 40°C.
3. You need to check and ensure that the power flowing through the common DC connection in the
common DC system does not exceed the rated power of the motor.
B.2.2 Derating
The load capacity decreases if the installation site ambient temperature exceeds 40°C, the altitude
exceeds 1000 meters or the switching frequency is changed from 4 kHz to 8, 12 or 15 kHz.
B.2.2.1 Temperature derating
The operation temperature range is-10°C to 40°C. If the ambient temperature of the VFD is above
40°C, it is necessary to derate. The maximum ambient temperature is 50°. Refer to the following list
for the actual derating.
Temperature and derating coefficient
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