Derating for high altitude, see
1.9 Special Conditions
Safety standards
EN/IEC 61800-5-1, UL 508C
EMC standards, Emission
EN 61800-3, EN 61000-6-3/4, EN 55011, IEC 61800-3
EMC standards, Immunity
EN 61800-3, EN 61000-3-12, EN 61000-6-1/2, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN
61000-4-5, EN 61000-4-6
1.9 Special Conditions
1.9.1 Derating for Ambient Temperature
and Switching Frequency
The ambient temperature measured over 24 hours should
be at least 5
°
C lower than the max. ambient temperature.
If the frequency converter is operated at high ambient
temperature, the continuous output current should be
decreased. For derating curve, see
VLT
®
HVAC Basic Design
Guide
.
1.9.2 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 de-rating 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 max. ambient temperature by 1
°
per 200
m.
Quick Guide
VLT
®
HVAC Basic Drive Cascade Controller Quick Guide
34
MG18F402 - VLT
®
is a registered Danfoss trademark
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