Goodrive20 Series VFD
Technical data
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Appendix A Technical data
A.1 Derated application
A.1.1 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:
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.
The rated capacity is the capacity at the ambient temperature of 40°C.
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.
A.1.2 Derating
If the ambient temperature on the site where the VFD 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
VFD needs to be derated.
A.1.2.1 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.
Derating coefficient (%)
Temperature (
℃
)
-10
0
10
20
30
40
50
100
90
80
60
40
20
Note:
It is not recommended to use the VFD at a temperature higher than 50°C. If you do, you
shall be held accountable for the consequences caused.
A.1.2.2 Derating due to altitude
When the altitude of the site where the VFD is installed is lower than 1000m, the VFD can run
at the rated power. When the altitude exceeds 1000m, derate by 1% for every increase of
100m. When the altitude exceeds 3000m, consult the local dealer or office for details.
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