Product Overview

The REXROTH VT2000-5X is a frequency converter and AC variable speed drive from the Bosch Rexroth VT-VS and VT-VSP series, designed for variable speed control of three-phase asynchronous motors in industrial applications. This series represents Rexroths robust and versatile drive platform for industrial automation. The VT2000 designation indicates the product line and frame size, while the 5X suffix is critical as it specifies the drives rated output power. The 5X suffix typically indicates a standard design for three-phase 400V AC input with output power ratings of 0.75 kW 1.5 kW or 2.2 kW corresponding to 1 HP 2 HP or 3 HP depending on the specific subcode such as 51 for 0.75 kW, 52 for 1.5 kW, or 53 for 2.2 kW.

This frequency converter transforms a fixed voltage and frequency from the mains supply into a variable voltage and variable frequency output. This conversion allows precise control of motor speed, torque, and acceleration and deceleration characteristics. The VT2000 series is known for its modularity, offering a range of options and accessories for flexible adaptation to various applications, from simple pump and fan control to more complex material handling systems.

Technical Specifications

Control and Operation

The REXROTH VT2000-5X employs voltage-to-frequency Vf control as its primary control method. This well-established technique maintains a constant voltage-to-frequency ratio throughout the speed range, ensuring that the motor produces rated torque at all speeds below base speed. The Vf characteristic is adjustable to suit different motor and load requirements, with options for linear Vf for constant torque loads such as conveyors and positive displacement pumps, and quadratic Vf for variable torque loads such as centrifugal fans and pumps. The drive provides adjustable acceleration and deceleration times, enabling smooth speed transitions that reduce mechanical stress on the driven equipment. Adjustable skip frequencies allow the drive to avoid critical speeds that could cause mechanical resonance in the driven system. Configurable start and stop functions include flying start for restarting a coasting motor, DC injection braking for rapid stopping, and programmable digital and analog inputs and outputs for flexible integration with external control systems.

Depending on the specific firmware version and option configuration, the VT2000-5X may support sensorless vector control for improved low-speed torque performance. This advanced control method estimates motor flux and torque without requiring a speed feedback encoder, providing better speed regulation and torque response compared to basic Vf control.

Protection and Diagnostics

The REXROTH VT2000-5X incorporates comprehensive protection features to safeguard both the drive and the connected motor. Overcurrent protection monitors output current and trips on short circuit or overload conditions. Overvoltage and undervoltage protection ensure proper operation within specified voltage ranges. Overtemperature protection monitors internal heatsink temperature and reduces output or shuts down if cooling is inadequate. Motor overload protection with adjustable trip class protects the motor from thermal damage due to prolonged overcurrent operation. The drive provides diagnostic capabilities including fault history storage, real-time monitoring of key operating parameters such as output frequency current voltage and DC bus voltage, and LED status indicators for immediate visual confirmation of drive status.

Key Features and Benefits

Applications

The REXROTH VT2000-5X frequency converter is suitable for a wide range of variable speed applications in industrial and commercial settings. Typical applications include pumps and fans where speed control provides significant energy savings, conveyors and material handling systems requiring smooth acceleration and adjustable speed, mixers and agitators where process control requires speed variation, machine tools including lathes mills and grinders, packaging machinery requiring precise speed synchronization, and HVAC systems including fans pumps and compressors.

Standards Compliance

The VT2000 series is designed to comply with applicable international standards including IEC 61800 for adjustable speed electrical power drive systems, IEC 61000 for electromagnetic compatibility ensuring the drive does not interfere with other equipment, and UL and CE certification for global market acceptance.