Protection and Features:
• Electronic thermal motor protection against overload.
• Temperature monitoring of the heatsink ensures that the adjustable frequency drive trips
if the temperature reaches 203°F ± 9°F [95 °C ± 5°C]. An overload temperature cannot
be reset until the temperature of the heatsink is below 158°C ± 9°C [70°C ± 5°C]
(Guideline - these temperatures may vary for different power sizes, enclosures, etc.).
VLT HVAC drive has an auto-derating function to prevent it's heatsink from reaching 203°
F [95°C].
• 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 is protected against ground faults on motor terminals U,
V, W.
Line power supply (L1, L2, L3):
Supply voltage 200-240 V ±10%
Supply voltage 380-480 V ±10%
Supply voltage 525-600 V ±10%
Supply frequency 50/60 Hz
Max. imbalance temporary between line phases 3.0% of rated supply voltage
True Power Factor () 0.9 nominal at rated load
Displacement Power Factor (cos) near unity (> 0.98)
Switching on input supply L1, L2, L3 (power-ups) enclosure type A maximum twice/min.
Switching on input supply L1, L2, L3 (power-ups) enclosure type B, C maximum once/min.
Environment according to EN60664-1 overvoltage category III/pollution degree 2
The unit is suitable for use on a circuit capable of delivering no more than 100,000 RMS sym-
metrical Amperes, 240/500/600 V maximum.
Motor output (U, V, W):
Output voltage 0 - 100% of supply voltage
Output frequency 0 - 1000 Hz
Switching on output Unlimited
Ramp times 1 - 3600 sec.
Torque characteristics:
Starting torque (Constant torque) maximum 110% for 1 min.
*
Starting torque maximum 120% up to 0.5 sec.
*
Overload torque (Constant torque) maximum 110% for 1 min.
*
*Percentage relates to the nominal torque for the VLT HVAC Drive.
8. Specifications VLT
®
HVAC Drive Instruction Manual
144
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
8
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