LTi DRiVES LR32.8 0925.0018 Line Reactor

The LTi DRiVES LR32.8 0925.0018 is a line reactor designed for use with industrial drive systems. It is connected between the supply and the drive input to improve the electrical behaviour of the rectifier. The reactor reduces current harmonics, limits inrush current during power up, and helps protect the drive from supply disturbances. The article number 0925.0018 identifies the specific construction and rating.

Function and Purpose

Drive input rectifiers draw current in short pulses, which creates harmonic content on the supply network. A line reactor adds inductance in series with the supply, which smooths the current waveform and reduces the harmonic content. This improves power quality and reduces the risk of interference with other equipment on the same network. The reactor also limits the rate of current rise during commutation and during supply transients.

Construction

The reactor consists of a magnetic core and copper or aluminium windings. The core material and air gap are selected to provide the required inductance without saturation under normal operating current. The windings are insulated to withstand the supply voltage and the thermal load produced by continuous current. The housing provides mechanical protection and allows mounting on a panel or in a cabinet. Terminals are sized for the rated current and for the connection of supply and drive cables.

Electrical Characteristics

The inductance value determines the impedance presented to harmonic currents. Higher inductance gives greater smoothing but also causes a larger voltage drop at full load. The reactor is designed so that this voltage drop remains within acceptable limits for the drive. The rated current must be at least equal to the drive input current. The insulation system must be suitable for the supply voltage and for the transient overvoltages that can occur on industrial networks.

Thermal Considerations

Current flowing through the windings produces heat. The reactor is designed to dissipate this heat through its surface and through the mounting panel. In cabinets with several reactors or drives installed close together, forced ventilation may be required. The ambient temperature must remain within the specified range. The reactor should not be mounted near temperature sensitive components.

Installation Guidelines

Mount the reactor securely and connect the supply to the input terminals and the drive to the output terminals. Observe the correct phase sequence where applicable. Use cables sized for the rated current and tighten terminals to the specified torque. Route power cables away from signal cables. Provide adequate clearance for cooling. Verify that the reactor is compatible with the drive input voltage and current.

Benefits in Drive Systems

Reducing harmonic current improves the overall power factor of the installation and reduces losses in transformers and cables. Limiting inrush current reduces stress on the rectifier and on the supply protection devices. Smoothing the current waveform also reduces radio frequency interference conducted back onto the supply. These benefits contribute to longer equipment life and more stable operation of the machine.

Applications

Line reactors are used in packaging machines, printing equipment, textile machines, handling systems, and general industrial drives. They are particularly useful where the drive is connected to a supply with limited impedance or where several drives operate on the same network. They are also used in installations where harmonic limits must be respected.

Maintenance and Service

The reactor requires little maintenance. Periodically inspect terminals for tightness and signs of overheating. Check the windings and core for dust accumulation and clean if necessary. Verify that the mounting is secure and that cooling paths are not blocked. If a reactor is replaced, confirm that the inductance and current rating match the original.

Selection Considerations

Select the reactor according to the drive input current, the supply voltage, and the required harmonic reduction. Confirm that the inductance value gives an acceptable voltage drop at full load. Check that the thermal design of the cabinet can accommodate the losses of the reactor. Verify that the article number and construction match the machine documentation.

Conclusion

The LTi DRiVES LR32.8 0925.0018 line reactor improves the electrical behaviour of industrial drive systems. It reduces harmonics, limits inrush current, and protects the drive rectifier. With correct selection and installation, it contributes to stable and efficient operation of the machine.