SD1 Series Inverters Technical Data
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Appendix A Technical Data
A.1 Ratings
A.1.1 Capacity
Inverter 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 inverter must be higher than or equal to the
rated motor current. Also, the rated power of the inverter 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:
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 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
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 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
A.1.2.2 Derating due to altitude
When the altitude of the site where the inverter is installed is lower than 1000m, the inverter
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 IMO dealer or office for
details.
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