Danfoss VLT HVAC Drive FC 100 Operating Instructions Manual page 118

5. General Specifications
Protection and Features:
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Connection to PC is carried out via a standard host/device USB cable.
The USB connection is galvanically isolated from the supply voltage (PELV) and other
high-voltage terminals.
The USB connection is not galvanically isolated from protection earth. Use only iso-
lated laptop/PC as connection to the USB connector on VLT HVAC Drive or an isolated
USB cable/converter.
Electronic thermal motor protection against overload.
Temperature monitoring of the heatsink ensures that the frequency converter trips if the
temperature reaches 95 °C ± 5°C. An overload temperature cannot be reset until the
temperature of the heatsink is below 70 °C ± 5°C (Guideline - these temperatures may
vary for different power sizes, enclosures etc.). VLT HVAC Drive has an auto derating
function to avoid it's heatsink reaching 95 deg C.
The frequency converter is protected against short-circuits on motor terminals U, V, W.
If a mains phase is missing, the frequency converter trips or issues a warning (depending
on the load).
Monitoring of the intermediate circuit voltage ensures that the frequency converter trips
if the intermediate circuit voltage is too low or too high.
The frequency converter is protected against earth faults on motor terminals U, V, W.
MG.11.F1.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC DRIVE High Power
Operating Instruction