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Appendix B Technical data
B.1
What this chapter contains
This chapter describes the technical data of the inverter and its compliance to CE and other quality
certification systems.
B.2
Derated application
B.2.1 Capacity
Choose an inverter based on the rated current and power of the motor. To endure the rated power of
the motor, the rated output current of the inverter must be larger or equal to the rated current of the
motor. The rated power of the inverter 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 inverter automatically restricts the torque and current of the
motor. This function effectively protect 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
If the ambient temperature on the site where the inverter is installed exceeds 40°C, the altitude
exceeds 1000 m, or the switching frequency is changed from 4 kHz to 8, 12, or 15 kHz, the inverter
needs to be derated.
B.2.2.1 Derating due to temperature
When the temperature ranges from +40°C to +50°C, the rated output current is derated by 1% for each
increased 1°C. For the actual derating, see the following figure.