VLT 3506 Danfoss
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The Danfoss VLT 3506 is part of the VLT 3000 Variable Speed Drives series and has a typical shaft output of 5 HP with an efficiency of 0.96 at full load. It operates with a nominal input voltage of 460 VAC on a 3-phase supply and provides a continuous output current of 8.2 Amps. The drive has a width of 11.18 inches and a depth of 7.01 inches.
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Product Description:
The VLT 3506 is an AC variable frequency drive produced by Danfoss within the VLT 3000 Variable Speed Drives series. Intended for industrial automation, the unit converts fixed-frequency three-phase mains power into a modulated output that allows controllers to regulate induction motor speed and torque. By matching motor characteristics with adjustable voltage and frequency, the drive provides energy-efficient motion control for pumps, fans, and material-handling equipment.
It accepts a nominal line voltage of 460 VAC from a three-phase supply, ensuring balanced power delivery to the inverter section. Under continuous duty, the power stage delivers 8.2 A of output current and has an apparent power rating of 7.1 kVA. These ratings allow a compatible downstream motor to operate near its nameplate load without requiring drive derating under normal conditions. For short overload events lasting up to 60 seconds, the current limit rises to 9.0 A, allowing acceleration profiles that overcome static friction and temporary process peaks. Protective logic restricts the unit to two starts per minute to minimize thermal stress on the semiconductor devices. Upstream conductors can be sized for the stated supply demand using appropriate 10 AWG cable where permitted by applicable electrical codes.
The enclosure measures 11.18 in wide and 7.01 in deep, allowing multiple drives to be arranged side by side in compact control panels with minimal clearance. A typical motor output rating of 5 HP matches medium-frame induction motors used on conveyors and HVAC blowers. The full-load efficiency is 0.96, which limits heat generation inside sealed cabinets and reduces the cooling burden during continuous operation. Upstream protection is limited to a 25 A maximum fuse rating, coordinating with the drive’s crest currents during electrical faults. The enclosure dimensions support installations where available panel width and depth are restricted. Adequate ventilation around the drive remains necessary to remove internally generated heat and maintain stable operation during long production cycles.
