ABB ACS550 Drive VFD De-Rating – There are three factor of derating temperature derating, altitude derating, switching frequency derating.
- Temperature derating
- Altitude derating
- Switching frequency derating
Derating – The load capacity (current and power) decreases for certain situations, as defined below. In such situations, where full motor power is required, oversize the drive so that the derated value provides sufficient capacity.
Temperature derating – In the temperature range +40 °C … 50 °C (+104 °F …122 °F), the rated output current is decreased 1% for every 1 °C (1.8 °F) above +40 °C (+104 °F). Calculate the output current by multiplying the current given in the rating table by the derating factor. Example If the ambient temperature is 50 °C (+122 °F), the derating factor is 100% – 1%/°C · 10 °C = 90% or 0.90. The output current is then 0.90 · I2N or 0.90 · I2hd.
Altitude derating – In altitudes 1000 … 4000 m (3300 …13,200 ft) above sea level, the derating is 1% for every 100 m (330 ft). If the installation site is higher than 2000 m (6600 ft) above sea level, contact your local ABB representative for further information.
Switching frequency derating – When using the 8 kHz switching frequency (parameter 2606),
- Derate all rated currents and powers (including drive’s overload currents) to 80%. When using the 12 kHz switching frequency (parameter 2606),
- Derate all rated currents and powers (including drive’s overload currents) to 65% (to 50% for 600 V, R4 frame sizes, that is for ACS550-U1-032A-6 … ACS550-U1- 062A-6),
- Derate ambient temperature maximum to 30 °C (86 °F).
- Note: The continuous maximum current is limited to I2hd .
Note: Setting parameter 2607 SWITCH FREQ CTRL = 1 ( ON ) allows the drive to reduce the switching frequency if/when the drive’s internal temperature exceeds 80 °C (with 12 kHz switching frequency) or 90 °C (with 8 kHz switching frequency).
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ABB ACS550 Drive VFD De-Rating
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