TD20 Series VFD
Appendix A Technical Data
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Appendix A Technical Data
A.1 Ratings
A.1.1 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 x PN. If the limit is exceeded, motor torque
and current are automatically restricted. The function protects the input bridge of the VFD 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.
A.1.2 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.
A.1.2.1 Temperature derating
In the temperature range of +40°C to +50°C, the rated output current is decreased by 1% for every
additional 1°C. Refer to the below list for the actual derating.
Derating coefficient (
%)
Temperature (
℃
)
-10
0
10
20
30
40
50
100
80
60
40
20
A.1.2.2 Altitude derating
The device can output rated power if the installation site below 1000m. The output power decreases if
the altitude exceeds 1000 meters. Below is the detailed decreasing range of the derating:
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