Danfoss VLT HVAC Drive FC 102 - Page 119

Speed accuracy (open-loop) 30–4000 rpm: Maximum error of ±8 RPM
All control characteristics are based on a 4-pole asynchronous motor
Control card performance
Scan interval 5 ms
Control card, USB serial communication
USB standard 1.1 (full speed)
USB plug USB type B “device” plug
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 ground. Use only isolated laptop/PC as connection to
the USB connector on the adjustable frequency drive or an isolated USB cable/drive.
Protection and features
•
Electronic thermal motor protection against overload.
•
If the temperature reaches a predened level, temperature monitoring of the heatsink ensures that the adjustable
frequency drive trips. An overload temperature cannot be reset until the temperature of the heatsink is below the
values stated in Table 7.1 to Table 7.4 (Guideline - these temperatures may vary for dierent power sizes, enclosure
sizes, enclosure ratings, 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 (depending on the load).
•
If the intermediate circuit voltage is too low or too high, monitoring of the intermediate circuit voltage ensures
that the adjustable frequency drive trips.
•
The adjustable frequency drive is protected against ground faults on motor terminals U, V, W.
General Specications Instruction Manual
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