VLT 2900 Danfoss
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The Danfoss VLT 2900 is part of the VLT 2900 Industrial Drives series and features one analog current input with a 10-bit resolution, as well as one analog voltage input. The drive includes five programmable digital inputs, a high start torque of 180 percent for 0.5 seconds, and supports a maximum ambient temperature of 45°C. Its output frequency resolution is 0.013 Hz, and the maximum allowable motor cable length is 40 meters.
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Product Description:
The VLT 2900 is an AC variable frequency drive produced by Danfoss within the VLT 2900 Industrial Drives series. It converts a fixed-frequency three-phase supply into variable-voltage and variable-frequency output, allowing squirrel-cage induction motors to start smoothly, accelerate under load, and maintain the commanded speed. Designed for conveyor sections, centrifugal pumps, and fan sets, the drive links plant controllers to motor terminals and provides electronic adjustment of process flow while minimizing mechanical wear.
The control interface offers one analog current channel and one analog voltage channel, and both are sampled every 13.3 ms. The current channel is digitized with 10-bit resolution, while a single analog output can drive instruments with loads up to 500 Ω. The unit provides 5 programmable digital inputs that tolerate 28 V DC, while a pulse input accepts frequencies up to 67.6 kHz and the open-collector digital output can sink 25 mA for relays or counters. Motor speed can be adjusted in increments of 0.013 Hz, allowing precise changes to process speed. The overload algorithm provides 180% start torque for 0.5 seconds to overcome static friction. Under nominal load, the phase displacement between current and voltage is limited, resulting in a true power factor of 0.90.
Installation guidelines permit motor leads up to 40 m without output reactors, allowing the drive and motor to be separated within larger machine layouts. The inverter maintains its rated performance at ambient temperatures up to 45 °C, provided that the required cabinet ventilation and mounting clearances are maintained. The rectifier bridge tolerates a phase-to-phase voltage imbalance of ±2.0%, allowing operation on lightly unbalanced utility feeders. Coordination with upstream protection is simplified because the power section can withstand a prospective fault current of 100,000 A. This fault-current capacity supports installation in cabinets connected to high-capacity electrical distribution systems, while the permitted motor-cable length supports practical routing between the drive and connected equipment.
