Derating of output current versus altitude at T
AMB, MAX
for frame sizes D, E and F.
3.5.4 Derating for Running at Low Speed
When a motor is connected to an adjustable frequency drive, 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, a motor may overheat 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 adjustable frequency drive limits 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.
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.
VLT
®
AQUA Drive Design Guide 3 VLT AQUA Selection
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
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