1.8 Special Conditions
1.8.1 Derating for Ambient Temperature
and Switching Frequency
The ambient temperature measured over 24 hours should
be at least 5 °C lower than the maximum ambient
temperature. If the frequency converter is operated at high
ambient temperature, the continuous output current
should be decreased. For derating curves, see VLT
®
Compressor Drive CDS 803 Design Guide.
1.8.2 Derating for Low Air Pressure
The cooling capability of air is decreased at low air
pressure. For altitudes above 2000 m, contact Danfoss
regarding PELV. Below 1000 m altitude no derating is
necessary, but above 1000 m the ambient temperature or
the maximum output current should be decreased.
Decrease the output by 1% per 100 m altitude above 1000
m or reduce the maximum ambient temperature by 1°C
per 200 m.
1.9
Options for VLT
®
Compressor Drive CDS
803
For options, see the VLT
®
Compressor Drive CDS 803 Design
Guide.
Quick Guide Quick Guide
MG18M102 Danfoss A/S © Rev. 09/2014 All rights reserved. 29
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