Danfoss VLT Series Design Manual page 71

VLT ® HVAC Drive Design Guide 3. VLT HVAC Selection
3.5.6. Automatic adaptations to ensure performance
The adjustable frequency drive constantly checks for critical levels of internal temperature, load
current, high voltage on the intermediate circuit and low motor speeds. As a response to a critical
level, the adjustable frequency drive can adjust the switching frequency and/or change the
switching pattern in order to ensure the performance of the drive. The capability to automatically
reduce the output current extends the acceptable operating conditions even further.
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MG.11.B4.22 - VLT ® is a registered Danfoss trademark.