Danfoss VLT FC 300 Instruction Manual page 116

5. General Specifications
Protection and Features:
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Electronic thermal motor protection against overload.
Temperature monitoring of the heatsink ensures that the adjustable frequency drive trips
if the temperature reaches a predefined level. An overload temperature cannot be reset
until the temperature of the heatsink is below the values stated in the tables on the
following pages (Guideline - these temperatures may vary for different power sizes, en-
closures, etc.).
The adjustable frequency drive is protected against short-circuits on motor terminals U,
V, W.
If a line phase is missing, the adjustable frequency drive trips or issues a warning (de-
pending on the load).
Monitoring of the intermediate circuit voltage ensures that the adjustable frequency drive
trips if the intermediate circuit voltage is too low or too high.
The adjustable frequency drive constantly checks for critical levels of internal tempera-
ture, 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 fre-
quency and/or change the switching pattern in order to ensure the performance of the
drive.
MG.33.U1.22 - VLT ® is a registered Danfoss trademark.
VLT ® Automation Drive FC 300
Instruction Manual High Power