Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 112

General Specifications
CAUTION
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 protective earth. Use only isolated laptop/PC as connection to the
USB connector on the frequency converter or an isolated USB cable/converter.
Protection and features
•
Electronic thermal motor protection against overload.
•
If the temperature reaches a predefined level, temperature monitoring of the heat sink ensures that the frequency
converter trips. An overload temperature cannot be reset until the temperature of the heat sink is below the
values stated in Table 7.1 to Table 7.4 (Guideline - these temperatures may vary for different power sizes, enclosure
sizes, enclosure ratings etc.).
•
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).
•
If the intermediate circuit voltage is too low or too high, monitoring of the intermediate circuit voltage ensures
that the frequency converter trips.
7 7
•
The frequency converter is protected against ground faults on motor terminals U, V, W.
110
Operating Instructions
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