Derating For Low Air Pressure And High Altitudes; Ip21/Nema Type 1 Enclosure Kit - Danfoss VLT CDS 803 Manual

VLT® Compressor Drive CDS 803
Design Guide
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Illustration 24: 400 V IP20 H6 30 kW (40 hp)

5.3.6 Derating for Low Air Pressure and High Altitudes

The cooling capability of air is decreased at low air pressure. For altitudes above 2000 m (6562 ft), contact Danfoss regarding PELV.
Below 1000 m (3281 ft) altitude, derating is not necessary. For altitudes above 1000 m (3281 ft), decrease the ambient temperature
or the maximum output current. Decrease the output by 1% per 100 m (328 ft) altitude above 1000 m (3281 ft) or reduce the maxi-
mum ambient cooling air temperature by 1 °C (1.8 °F) per 200 m (656 ft).

5.4 IP21/NEMA Type 1 Enclosure Kit

If environment, air quality, or surroundings require extra protection, an IP21/NEMA Type 1 kit can be ordered, see
and Spare Parts. The IP21/NEMA Type 1 is an optional enclosure element available for IP20 units. If the enclosure kit is used, an IP20
unit is upgraded to comply with enclosure IP21/NEMA Type 1.
The IP21/IP21 are not suitable for outdoor mounting.
Danfoss A/S © 2021.05
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N O T I C E
Mechanical Installation
Considerations
7.3 Accessories
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