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HARDWARE SELECTION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
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2.2.3 - Determination of the Isp continuous output current
When altitude is > 1000 m, air pressure and density decrease. As a result, the speed of the air entering the electrical box is reduced,
thus affecting the cooling of the components.
It is therefore necessary to derate the Isp current:
Isp = (Isp_40°C) x Af x Tf
Where:
Isp_40°C
= ISP continuous output current of the Powerdrive MD Smart determined for a T_rate at 40°C, indicated in the selection
tables in
Af
= Derating coefficient determined from the derating curve for the following altitude.
Tf
= Derating coefficient determined from the derating curve for the following ambient temperature.
• Derating curve for altitude (Af coefficient)
Note: For applications over 3000 m, contact Leroy-Somer.
• Derating curve according to ambient temperature (Tf coefficient)
Note
If the variable speed drive is to operate above 40 °C, the derating at 50 °C shall be carried out: Isp = (Isp_50°C) x Af
Содержание Leroy-Somer Powerdrive MD Smart
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