Danfoss VLT Series Design Manual page 61

VLT ® HVAC Drive Design Guide
Protection and Features:
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Line power supply (L1, L2, L3):
Supply voltage
Supply voltage
Supply voltage
Supply frequency
Max. imbalance temporary between line phases
True Power Factor (λ)
Displacement Power Factor (cosφ) near unity
Switching on input supply L1, L2, L3 (power-ups) ≤ enclosure type A
Switching on input supply L1, L2, L3 (power-ups) ≥ enclosure type B, C
Environment according to EN60664-1
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
Output frequency
Switching on output
Ramp times
Torque characteristics:
Starting torque (Constant torque)
Starting torque
Overload torque (Constant torque)
*Percentage relates to the nominal torque for the VLT HVAC Drive.
Cable lengths and cross-sections:
Max. motor cable length, shielded/armored
Max. motor cable length, unshielded/unarmored
Max. cross-section to motor, line power, load sharing and brake *
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.
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
3. VLT HVAC Selection
200-240 V ±10%
380-480 V ±10%
525-600 V ±10%
3.0% of rated supply voltage
≥ 0.9 nominal at rated load
maximum twice/min.
maximum once/min.
overvoltage category III/pollution degree 2
0 - 100% of supply voltage
maximum 110% for 1 min.
maximum 120% up to 0.5 sec.
maximum 110% for 1 min.
VLT HVAC Drive: 492 ft [150 m]
VLT HVAC Drive: 984 ft [300 m]
3
50/60 Hz
(> 0.98)
0 - 1000 Hz
Unlimited
1 - 3600 sec.
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