Danfoss VLT FC 51 - Special Conditions; Derating for Ambient Temperature; Derating for Low Air Pressure; Derating for Running at Low Speeds

Surroundings
Enclosure IP20
Enclosure kit available IP21, TYPE 1
Vibration test 1.0 g
Max. relative humidity 5%-95 % (IEC 60721-3-3; Class 3K3 (non-condensing) during operation
Aggressive environment (IEC 60721-3-3), coated class 3C3
Test method according to IEC 60068-2-43 H2S (10 days)
Ambient temperature Max. 40 °C
Derating for high ambient temperature, see
Minimum ambient temperature during full-scale operation 0 °C
Minimum ambient temperature at reduced performance - 10 °C
Temperature during storage/transport -25 to +65/70 °C
Maximum altitude above sea level without derating 1000 m
Maximum altitude above sea level with derating 3000 m
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 61000-6-1/2, EN 61000-4-2, EN 61000-4-3,
EN 61000-4-4, EN 61000-4-5, EN 61000-4-6
See 1.9 Special Conditions
1.9 Special Conditions
1.9.1 Derating for Ambient Temperature
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.
The frequency converter has been designed for operation
at max 50 °C ambient temperature with one motor size
smaller than nominal. Continuous operation at full load at
50 °C ambient temperature will reduce the lifetime of the
frequency converter.
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 degree
per 200 m.
1.9.3 Derating for Running at Low Speeds
When a motor is connected to at frequency converter, it is
necessary to check that the cooling of the motor is
adequate.
A problem may occur at low speeds in constant torque
applications. Running continuously at low speeds – below
half the nominal motor speed – may require additional air
cooling. Alternatively, choose a larger motor (one size up).
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