VLT 6004 Danfoss
Wake Industrial LLC is not an authorized distributor of this product.
The Danfoss VLT 6004 is part of the VLT 6000 HVAC Drives series and provides a typical shaft output of 2.2 kW with a true power factor of 0.90. It delivers 100% acceleration torque, can handle 110% starting torque for 1 minute, and features a speed control range of 1:100. The drive tolerates up to 95% relative humidity and operates at altitudes up to 1000 meters.
Internal Product Review
The VLT 6004 is a Danfoss HVAC drive with 2.2 kW typical shaft output and a 1:100 speed control range. Control quality is impressive, with ±0.003 Hz frequency resolution and a 3 msec system response time supporting stable HVAC regulation. Strong starting behavior from 110% starting torque makes this unit a dependable choice for precise building automation service.
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Product Description:
The VLT 6004 is an AC variable frequency drive from Danfoss and belongs to the VLT 6000 HVAC Drives series. It modulates three-phase motor voltage and frequency so ventilation fans, pumps, or compressors follow actual airflow or pressure demand rather than running at a fixed speed. By adjusting shaft output in real time, the drive helps building automation systems maintain temperature and air quality while reducing the energy drawn by induction motors in commercial and industrial HVAC installations. It mounts inside control panels and interfaces with common building management systems through standard I/O terminals and serial links.
During startup, the drive can deliver an acceleration torque of 100%, allowing the connected motor to rise smoothly to its setpoint without mechanical strain. For loads that seize after a long standstill, a breakaway reserve of 160% for 0.5 seconds overcomes static friction. Closed-loop PWM resolution reaches ±0.003 Hz, so fan impellers receive exceptionally fine speed increments, which is important when airflow must track the setpoint within narrow bands. Protective circuitry is rated for a short-circuit current of 100,000 A, enabling installation on high-capacity mains when appropriately coordinated upstream protection is used. Continuous operation is permitted at up to 95% RH, allowing the electronics to operate in humid equipment rooms when condensation is prevented.
The inverter can sustain an overload torque of 110% during standard duty cycles, and its speed control range of 1:100 keeps variable-air-volume fans stable from low speed to full flow. Control logic updates internal references in 3 ms, giving building controllers a rapid response when damper positions or pressure sensor readings change. With a true power factor of 0.90, the unit uses the available supply power efficiently and helps limit reactive power demand. The drive tolerates a supply phase imbalance within ±2.0%, supporting operation when minor voltage differences occur between phases. Installations at elevations up to 1,000 m do not require derating, allowing the drive to retain its stated operating capability across many building locations.
