Danfoss VLT AutomationDrive FC 300 Instruction Manual page 88

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.A9.22 - VLT is a registered Danfoss trademark
®
VLT AutomationDrive FC 300 Instruction
Manual