B.2.1 Capacity

VFD sizing is based on the rated motor current and power. To achieve the rated motor power given in the table, the rated current of the VFD must be higher than or equal to the rated motor current. Also the rated power of the VFD must be higher than or equal to the rated motor power. The power ratings are the same regardless of the supply voltage within one voltage range.

Note:

1. The maximum allowed motor shaft power is limited to 1.5 · PN. If the limit is exceeded, motor torque and current are automatically restricted. The function protects the input bridge of the drive against overload.

2. The ratings apply at ambient temperature of 40 °C

3. It is important to check that in Common DC systems the power flowing through the common DC connection does not exceed PN.

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

In the temperature range +40 °C…+50 °C, the rated output current is decreased by 1% for every additional 1 °C. Refer to the below list for the actual derating.

Note: It is not recommended to use the VFD at above 50℃, otherwise, the consequences arising from thereform shall be undertaken by the clients.

B.2.2.2 Altitude derating

When the installation site altitude is lower than 1000 m, the VFD can run at the rated power. If the altitude on the site is higher than 1000 m, and not more than 3000 m, the maximum power is derated by 1% for every increased 100 m. For details about the derating, see the following figure.

When the altitude exceeds 2000m, configure an isolation transformer on the input end of the VFD.

When the altitude exceeds 3000m but is lower than 5000m, contact us for technical consultation. Do not use the VFD at an altitude higher than 5000m.

B.2.2.3 Carrier frequency derating

For Goodrive300 series VFDs, different power level corresponds to different carrier frequency range. The rated power of the VFD is based on the factory carrier frequency, so if it is above the factory value, the VFD needs to derate 10% for every additional 1 kHz carrier frequency.