Example 1, IEC: How to calculate the derated current
The drive type is ACH480-04-018A-4, which has a nominal output current (I
N
) of 17 A
at 400 V. Calculate the derated output current at 4 kHz switching frequency, at 1500 m
altitude and at 55 °C surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 1500 m is
Surrounding air temperature derating: The derating factor for 55 °C surrounding air
temperature is
Multiply the nominal drive output current by all the applicable derating factors. In this
example, the derated output current becomes
Example 1, UL (NEC): How to calculate the derated current
The drive type is ACH480-04-014A-4, which has nominal output current (I
N
) of 14 A at
480 V. Calculate the derated output current at 4 kHz switching frequency, at 6000 ft
altitude and at 131 °F surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 6000 ft is
Surrounding air temperature derating: The derating factor for 131 °F surrounding air
temperature is
Multiply the nominal drive output current by all the applicable derating factors. In this
example, the derated output current becomes
Example 2, IEC: How to calculate the required drive
The application requires a nominal motor current of 6.0 A at a switching frequency of
8 kHz. The supply voltage is 400 V, the altitude is 1800 m and the surrounding air
temperature is 35 °C.
126 Technical data
To Next Page
Loading...
