9 Special Conditions
9.1 Derating for Ambient Temperature
The ambient temperature measured over 24 hours should be at least 5 °C (9 °F) lower than the maximum ambient temperature.
If the drive is operated at high ambient temperature, decrease the continuous output current.
The drive has been designed for operation at maximum 50 °C (122 °F) ambient temperature with 1 motor size smaller than nominal.
Continuous operation at full load at 50 °C (122 °F) ambient temperature reduces the lifetime of the drive.
9.2 Derating for Low Air Pressure
The cooling capability of air is decreased at low air pressure.
C A U T I O N
INSTALLATION AT HIGH ALTITUDE
For altitudes above 2000 m (6560 ft), contact Danfoss regarding PELV.
Below 1000 m (3280 ft) altitude, no derating is necessary, but above 1000 m (3280 ft), decrease the ambient temperature or the
maximum output current.
Decrease the output by 1% per 100 m (328 ft) altitude above 1000 m (3280 ft), or reduce the maximum ambient temperature by 1 °C
(1.8 °F) per 200 m (656 ft).
9.3 Derating for Running at Low Speeds
When a motor is connected to a drive, 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 – less than half the nomi-
nal motor speed – may require extra air cooling. Alternatively, select a larger motor (1 size up).
AQ348848915086en-000101 / 130R094332 | Danfoss A/S © 2020.09
Special Conditions
VLT® Micro Drive FC 51
Operating Guide
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