Product Overview

The Schneider Electric LXM23DU20M3X is a 2 kW servo drive in the Lexium 23 family. It controls a compatible servo motor in machinery that requires repeatable positioning, regulated speed, and controlled acceleration and deceleration. Rather than simply supplying power to a motor, the drive processes motion commands and uses encoder feedback to regulate the motor’s response during operation.

This model is suited to applications where the servo axis must deliver substantial power while following a defined movement sequence. Examples include packaging machinery, automated assembly equipment, indexing tables, material-feeding mechanisms, and specialized production machines. Its 2 kW rating makes it relevant to axes with greater power requirements than those served by smaller models in the Lexium 23 range.

In a packaging machine, for example, a servo-driven feed mechanism may need to advance material, stop at a precise position, and wait for a sealing operation before continuing. The controller generates the movement commands, while the LXM23DU20M3X regulates the motor throughout the cycle. Encoder feedback helps the drive monitor the motor’s response and maintain controlled movement.

The LXM23DU20M3X uses an I/O-oriented control arrangement with pulse-based positioning capability. It supports position, speed, and torque control functions, allowing the drive to serve different types of motion axes when configured appropriately. Programmable digital inputs and outputs connect its operation with external control signals, machine interlocks, and status monitoring.

Controller compatibility is an important part of system selection. The LXM23DU20M3X should not be confused with LXM23A variants that incorporate CANopen communication. A pulse-based controller can be suitable for this model when its electrical interface, signal timing, and command logic meet the drive’s requirements.

The nominal power rating alone does not determine whether the drive can handle a particular machine. Motor current, peak torque, load inertia, acceleration time, operating speed, and stopping frequency all influence the final configuration. An axis carrying a heavy fixture through frequent acceleration and deceleration cycles may require different settings and braking provisions from a continuously rotating mechanism.

For commissioning engineers, the drive must be assessed as part of the complete servo system. Motor selection, encoder feedback, electrical wiring, command scaling, and mechanical transmission all affect the resulting motion. Proper configuration and controlled commissioning help reduce positioning errors, unexpected stops, and unnecessary drive faults.

Technical Specifications

Product Features

• 2 kW nominal power: Supports servo axes with substantial motor power requirements.
• Pulse-based positioning: Accepts supported positioning commands from compatible controllers.
• Three control functions: Supports position, speed, and torque control according to the selected configuration.
• Programmable digital inputs: Provides eight inputs for configured operating and control signals.
• Digital outputs: Offers five outputs for supported status and control functions.
• Analog voltage inputs: Supports applicable analog-reference arrangements.
• Encoder feedback: Allows the drive to regulate motor movement using feedback signals.
• Built-in motion sequences: Supports configured movement sequences for suitable repetitive applications.
• Natural-convection cooling: Uses passive cooling, making cabinet ventilation and mounting clearances important.
• External braking provision: Supports an appropriate external braking arrangement when regenerative-energy requirements call for one.

Working Principle

The LXM23DU20M3X receives movement commands from a compatible controller or executes a configured motion sequence. It regulates the electrical power supplied to the servo motor and processes encoder feedback to control the motor’s response.

PLC or Motion Controller → Pulse Commands → LXM23DU20M3X → Servo Motor → Mechanical Axis

In position-control mode, pulse commands represent the requested movement. The drive interprets the incoming signals according to the configured command scaling and electronic gearing, then regulates the motor during acceleration, travel, and deceleration. The relationship between pulse count and actual mechanical movement depends on the motor feedback arrangement and the transmission connecting the motor to the load.

Consider an automated assembly station that moves a component into position for insertion or fastening. The controller issues the required movement command, and the servo drive regulates the motor as the mechanism approaches its target. Once the positioning sequence reaches its configured completion condition, the machine controller can coordinate the next operation.

Speed control serves applications where the motor must follow a specified speed reference rather than repeatedly move between fixed positions. A feed roller or rotating mechanism may use this mode to maintain the required speed during production. The command source and operating parameters must match the selected control arrangement.

Torque control is relevant when the application requires regulation of motor torque as its primary objective. It can be useful for certain variable-load mechanisms, but the torque command, operating limits, and motor configuration must be selected carefully. Mechanical protection remains necessary wherever jamming or excessive force could damage equipment.

The programmable digital inputs and outputs connect drive operation with the wider machine-control sequence. Depending on their assignments, these signals can support applicable enable, reset, limit, and status functions. Their behavior depends on the drive configuration and the controller program.

During deceleration, the motor may return energy to the drive. A high-inertia load or frequent stopping cycle can increase regenerative-energy demand. Where this exceeds the drive’s permitted energy-handling capability, an appropriately selected external braking resistor may be required.

If the machine develops inconsistent positioning, vibration, or repeated following errors, the investigation should cover command scaling, encoder feedback, motor settings, mechanical backlash, and load inertia. Adjusting tuning parameters without identifying the underlying cause can make the fault more difficult to resolve.

Role in a Lexium 23 Motion Control System

The LXM23DU20M3X acts as the motor power and motion-control stage between the machine controller and the driven mechanism. It processes movement commands, regulates motor output, and uses feedback to control the motor’s response.

PLC or Motion Controller → Servo Drive → Servo Motor → Mechanical Transmission → Machine Axis

Industrial Applications

The LXM23DU20M3X is most appropriate when its 2 kW rating, three-phase supply, motor compatibility, and pulse-control interface match the machine’s motion requirements.

Installation and Maintenance

1. Verify the supply circuit: Confirm that the incoming three-phase supply falls within the specified 170–255 V AC range and that the circuit protection is appropriate for the installation.
2. Check motor compatibility: Confirm the motor’s rated current, voltage, power, encoder type, and supported drive-motor combination before making electrical connections.
3. Prepare the cabinet: Provide sufficient ventilation for natural-convection cooling and keep the installation environment within the specified operating conditions.
4. Follow mounting requirements: Install the drive in the prescribed vertical orientation and maintain the required clearances around the unit and adjacent equipment.
5. Inspect grounding and protection: Verify protective grounding, supply-side circuit protection, and isolation arrangements before energizing the system.
6. Check motor power wiring: Confirm correct motor connections, secure terminals, suitable cable ratings, and grounding continuity.
7. Inspect encoder feedback: Check the encoder cable and connector for secure installation and compatibility with the connected motor. Keep feedback wiring appropriately separated from sources of electrical interference.
8. Configure pulse commands: Set the required pulse scaling and electronic gearing, then verify movement direction and signal timing against the controller output.
9. Assign digital I/O functions: Configure the required inputs and outputs for the machine’s enable, reset, limit, and status requirements.
10. Adjust the motion profile: Set acceleration, deceleration, speed limits, and positioning parameters according to the load inertia and production cycle.
11. Test the axis under controlled conditions: Commission the mechanism at reduced speed and verify direction, feedback response, stopping behavior, and positioning before normal production.
12. Maintain configuration records: Record motor details, parameter settings, alarms, wiring changes, and maintenance findings to support subsequent troubleshooting.

When repeated positioning errors or overvoltage faults occur, inspect the command signals, encoder feedback, load inertia, deceleration profile, and braking arrangement. This helps distinguish configuration problems from excessive regenerative energy or mechanical resistance.

Related Components

Recommended Related Models

Key Advantages

• Supports servo applications requiring 2 kW nominal output.
• Accepts pulse-based positioning commands from compatible controllers.
• Supports position, speed, and torque control functions.
• Includes programmable digital inputs and digital outputs.
• Provides analog voltage inputs for supported command arrangements.
• Uses encoder feedback for closed-loop motor regulation.
• Supports three-phase AC power within the specified voltage range.
• Allows external braking provisions where regenerative-energy demand requires them.

Technical FAQs

What should be evaluated when pairing the LXM23DU20M3X with a servo motor?

The motor’s rated current, voltage, encoder type, and compatibility with the drive must be checked first. The application also needs sufficient torque and acceleration capability for its load inertia and operating cycle. The 2 kW rating alone does not establish that every 2 kW motor is suitable.

Can the LXM23DU20M3X accept positioning commands from a PLC?

Yes, when the PLC provides compatible pulse commands and meets the drive’s electrical and signal-timing requirements. Pulse scaling, electronic gearing, direction logic, and the controller program must be configured consistently to obtain the intended mechanical movement.

What distinguishes the LXM23DU20M3X from a CANopen-equipped servo drive?

The LXM23DU20M3X uses the I/O-oriented configuration of the Lexium 23 family, with pulse-based positioning capability. It should not be treated as a CANopen-equipped LXM23A model. The available controller interface is therefore a key factor when choosing a drive for an existing machine.

Why can a servo drive generate an overvoltage fault during deceleration?

When the motor slows a moving load, regenerative energy can return to the drive. High inertia, rapid deceleration, and frequent stopping can increase the energy involved. Reviewing the motion profile and braking arrangement helps determine whether the application needs a different deceleration setting or an appropriately selected external braking resistor.