Product Description:

The VLT 6011 is an AC variable frequency drive produced by Danfoss for the VLT 6000 HVAC Drives series. It is intended for air-handling units, chilled-water pumps, and other ventilation equipment where automatic speed control lowers power consumption and noise. The drive receives constant mains voltage and delivers a synthesized output that tracks demand signals from building controllers, so fans and pumps operate only as needed by a zone or control loop.

Across 200–240 V supplies, the inverter can deliver a phase current of 30.8 A, translating to an apparent power capability of 12.8 kVA. When powered from 380–440 V mains, the output current drops to 16.0 A because the higher line voltage provides the same shaft power with lower amperage. Output frequency trimming has a resolution of 0.003 Hz, allowing tight proportional-integral control of static pressure or water head. For brief overloads, the unit can raise motor torque to 110% of the rated value without tripping, accommodating damper shifts or valve changes. At 400 V, the module can sustain 11.5 kVA continuously. The true power factor remains 0.90, helping reduce the reactive current drawn through upstream conductors.

Screened motor leads may extend up to 100 m on 380–460 V systems, while 525–600 V applications allow 50 m before reflection protection is required. Digital gating refreshes every 3 ms, so commanded speed adjustments appear quickly at the terminals. The drive withstands fault currents up to 100,000 A when paired with correctly rated protective equipment, supporting use with high-capacity switchboards. A typical shaft output of 7.5 kW covers common 10 hp fan wheels, and unlimited output-side switching permits repeated start-stop sequences imposed by economizer logic. Operation is permitted at elevations up to 1,000 m. Separate 550 V ratings of 11.5 A and 11.0 kVA broaden the usable supply range.