VLT 3011 Danfoss
Wake Industrial LLC is not an authorized distributor of this product.
The Danfoss VLT 3011 is part of the VLT 3000 Variable Speed Drives series and provides a constant torque output of 7.5 kW with a variable torque output of 11.0 kW. This model has an efficiency of 0.96, offers open loop accuracy of ±0.01%, and features both ground and short-circuit proof protection.
Internal Product Review
The VLT 3011 is a Danfoss variable speed drive with 7.5 kW constant torque output and 11.0 kW variable torque output. Open-loop accuracy of ±0.01% and frequency resolution of ±0.05% support very precise speed regulation in demanding applications. Ground- and short-circuit-proof protection adds strong operational confidence, making the drive an excellent choice for dependable motor control.
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Product Description:
The VLT 3011 is an AC variable frequency drive manufactured by Danfoss for the VLT 3000 Variable Speed Drives series. It converts fixed-frequency, three-phase mains power into a pulse-width modulated output that allows factory controllers to adjust induction motor speed and torque without mechanical throttling. In automated conveyors, pumps, and fan systems, it stabilizes process variables by regulating motor flux in response to control commands. This electronic speed control can reduce unnecessary motor operation when an application does not require full output.
The drive can supply a constant-torque load of up to 7.5 kW and a variable-torque load of up to 11.0 kW, allowing the same unit to operate positive-displacement machines or centrifugal equipment. Electrical losses are limited because its efficiency reaches 0.96 under nominal operating conditions. Speed reference resolution is maintained at ±0.05%, providing fine adjustment of the commanded motor frequency. Open-loop accuracy is ±0.01%, which helps keep the output frequency closely aligned with its setpoint. A closed-loop PID regulator provides an accuracy of ±0.1% for pressure or flow control, while slip calculation maintains output within ±0.5% of the rated synchronous speed. The output supports unlimited switching by external contactors, allowing the motor to be isolated without damaging the inverter.
In constant-torque service, the unit tolerates ambient temperatures up to 45 °C, while the maximum temperature for variable-torque operation is 40 °C. Power terminals accept conductors as large as 16.0 mm², accommodating panels that use heavy-gauge wiring for motor and supply connections. The inverter section is protected against ground faults and short circuits, preventing downstream electrical faults from damaging the power stage or propagating toward the supply. Mechanical resilience was verified through a vibration test at 0.7 g, supporting operation where normal machinery vibration reaches the enclosure. A thermistor input that follows the DIN 44081 standard monitors motor temperature and allows the drive to respond before thermal overload damages the connected motor. Ground-fault detection, short-circuit monitoring, and motor temperature supervision operate alongside the drive’s normal speed and torque regulation functions.
