Danfoss ADAP-KOOL AKD 102 Operating Instructions Manual page 126

Specifications
An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high
altitudes.
9.2.4 Derating for running at low speed
When a motor is connected to a frequency converter, it is necessary to check that the cooling of the motor is adequate.
The level of heating depends on the load on the motor, as well as the operating speed and time.
Constant torque applications (CT mode)
A problem may occur at low RPM values in constant torque applications. In a constant torque application s a motor may
over-heat at low speeds due to less cooling air from the motor integral fan.
Therefore, if the motor is to be run continuously at an RPM value lower than half of the rated value, the motor must be
supplied with additional air-cooling (or a motor designed for this type of operation may be used).
An alternative is to reduce the load level of the motor by choosing a larger motor. However, the design of the frequency
converter puts a limit to the motor size.
Variable (Quadratic) torque applications (VT)
In VT applications such as centrifugal pumps and fans, where the torque is proportional to the square of the speed and the
power is proportional to the cube of the speed, there is no need for additional cooling or de-rating of the motor.
9 9
In the graphs shown below, the typical VT curve is below the maximum torque with de-rating and maximum torque with
forced cooling at all speeds.
Legend: ─ ─ ─ ─Typical torque at VT load ─•─•─•─Max torque with forced cooling ‒‒‒‒‒Max torque
Note 1) Over-syncronous speed operation will result in the available motor torque decreasing inversely proportional with the increase in
speed. This must be considered during the design phase to avoid over-loading of the motor.
9.2.5 Derating for the installation of long motor cables or cables with larger cross-section
NOTE
Applicable for drives up to 90 kW only.
The maximum cable length for this frequency converter is 300 m unscreened and 150 m screened cable.
The frequency converter has been designed to work using a motor cable with a rated cross-section. If a cable with a larger
cross-section is used, reduce the output current by 5% for every step the cross-section is increased.
(Increased cable cross-section leads to increased capacity to earth, and thus an increased earth leakage current).
126
ADAP-KOOL
Maximum load for a standard motor at 40 °C driven by a frequency converter type VLT FCxxx
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Drive Operating Instructions
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MG.11.L4.02 - ADAP-KOOL Drive