Schneider Electric LXM05AD28M2 AC Servo Drive – Lexium 05

Schneider Electric LXM05AD28M2 – Single-Axis AC Servo Drive for Precision Motion Control

The LXM05AD28M2 is a single-phase AC servo drive within Schneider Electric’s Lexium 05 (LXM05) product family, designed to deliver closed-loop torque, velocity, and position control across a broad range of industrial motion applications. Rated at 2.8 A RMS continuous output current with a 3× peak overload capacity of 8.4 A RMS, this drive is sized for servo axes requiring fast dynamic response within a compact DIN-rail or panel-mount footprint. Its 200–240 V AC single-phase input topology makes it directly compatible with standard single-phase industrial supply networks, eliminating the need for a dedicated three-phase transformer in low-to-mid power axis configurations.

The drive accepts encoder feedback from Schneider Electric BSH and BMH servo motor families via a 15-pin Sub-D incremental or absolute encoder interface, enabling sub-millisecond position loop closure. Internal current regulation operates at a 16 kHz PWM switching frequency, producing low motor heating and reduced acoustic noise compared with drives operating at 4–8 kHz. The control architecture supports three independent operating modes — CSP (Cyclic Synchronous Position), CSV (Cyclic Synchronous Velocity), and CST (Cyclic Synchronous Torque) — selectable via fieldbus object dictionary entries without hardware reconfiguration.

Communication is handled through a dual-port interface supporting CANopen DS402 and Modbus RTU simultaneously, allowing the LXM05AD28M2 to participate in both legacy RS-485 networks and modern CANopen motion bus topologies without additional gateway hardware. The integrated Safe Torque Off (STO) function, certified to SIL 2 / PLd per IEC 62061 and EN ISO 13849-1, removes motor torque within 10 ms of a safety input de-energization event, satisfying machinery safety requirements without an external contactor in the motor circuit.

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Technical Parameters

Hardware Logical Analysis

Power Stage Architecture: The LXM05AD28M2 employs an IGBT-based three-phase inverter bridge driven by a dedicated gate driver IC with hardware overcurrent shutdown latency under 2 µs. The DC bus capacitor bank is sized to sustain the 3× peak current demand for up to 3 seconds without bus voltage collapse, a critical parameter for applications with high-inertia loads requiring rapid acceleration ramps. An integrated braking chopper activates at a DC bus threshold of approximately 400 V DC, dissipating regenerative energy through an external braking resistor — the drive’s RB terminal accepts resistors from 33 Ω upward, with the minimum resistance determined by the peak regenerative power of the connected motor-load combination.

EMC Design: The drive integrates a line-side EMC filter meeting EN 61800-3 Category C2 limits, suppressing conducted emissions on the supply line without requiring an external filter for most standard installations. The motor output stage uses a common-mode choke on the U/V/W terminals to attenuate high-frequency leakage currents that would otherwise flow through motor bearing races — a failure mode that shortens bearing life in high-speed servo applications. Shield termination clamps on the motor cable connector provide a low-impedance path to the drive chassis, maintaining shield effectiveness above 10 MHz.

Current Loop and Velocity Loop Timing: The current regulation loop executes at 62.5 µs (16 kHz), while the velocity loop closes at 250 µs and the position loop at 1 ms. These nested loop periods are fixed in firmware and are not user-configurable, which ensures deterministic control behavior across all operating modes. The auto-tuning routine measures motor electrical time constant and mechanical inertia ratio, then sets proportional and integral gains for both velocity and current loops within a single automated sequence lasting approximately 30 seconds.

Encoder Signal Processing: The encoder interface accepts differential RS-422 incremental signals up to 4 MHz line frequency (equivalent to 16 million counts/revolution at 4× interpolation for a 4096-line encoder), as well as SinCos analog encoder signals with 1 Vpp amplitude. The internal interpolation ASIC resolves SinCos signals to 12-bit sub-period resolution, yielding effective position resolution of 4096 × 4096 = 16,777,216 counts/revolution for compatible absolute encoders — sufficient for sub-micron positioning in lead-screw-driven linear axes.

System Integration Benefits

• Deterministic CANopen Synchronization: The drive supports SYNC object-triggered PDO transmission, allowing position and velocity setpoints to be updated synchronously across multiple axes on a shared CAN bus at cycle times down to 1 ms, eliminating inter-axis timing jitter caused by asynchronous polling.
• Modbus RTU Coexistence: Both CANopen and Modbus RTU interfaces are active simultaneously, enabling a supervisory SCADA or HMI to read drive status registers via Modbus while the motion controller issues trajectory setpoints via CANopen — without protocol switching or gateway hardware.
• Transparent Fault Diagnostics: The drive maintains a 32-entry fault history log accessible via SoMove software or fieldbus object 0x1003. Each entry records fault code, operating mode, DC bus voltage, output current, and motor speed at the moment of fault — providing root-cause data without requiring an oscilloscope or external data logger.
• STO Wiring Simplification: The dual-channel STO input (STO_A and STO_B) accepts 24 V DC signals from a safety relay or safety PLC output directly, with internal cross-fault detection between channels. This eliminates the external motor contactor and its associated wiring, reducing panel component count and contactor wear-related maintenance intervals.
• EcoStruxure Machine Expert Compatibility: The LXM05AD28M2 is natively supported in Schneider Electric’s EcoStruxure Machine Expert (formerly SoMachine) IEC 61131-3 development environment via a pre-certified PLCopen Motion Control function block library, reducing axis commissioning time compared with custom motion code development.
• Modicon PLC Direct Integration: When paired with Modicon M241, M251, or M340 PLCs, the drive appears as a standard CANopen DS402 device node. The PLC’s built-in CANopen master handles node guarding, heartbeat monitoring, and emergency message reception — providing automatic drive fault detection at the controller level without application-layer polling code.
• Scalable Multi-Axis Topology: Up to 127 LXM05 drives can share a single CANopen segment (subject to bus load constraints), and the network can be extended with standard CANopen repeaters. This flat topology avoids the hierarchical wiring complexity of proprietary motion bus architectures and simplifies cable routing in multi-axis gantry or conveyor systems.
• Real-Time Oscilloscope via SoMove: The SoMove commissioning tool provides a 4-channel software oscilloscope sampling internal drive variables (position error, current demand, velocity feedback, DC bus voltage) at the current loop rate of 62.5 µs, enabling in-situ tuning verification without external measurement equipment.
• Regenerative Energy Management: The integrated braking chopper with configurable threshold voltage allows the system designer to select an external braking resistor matched to the application’s deceleration energy profile, preventing DC bus overvoltage trips during rapid deceleration cycles in high-duty-cycle applications such as pick-and-place or indexing tables.

Quality Assurance & Global Logistics

Every LXM05AD28M2 unit dispatched from our Xiamen, China facility is a factory-original Schneider Electric component procured through verified supply channels. Units are stored in a temperature- and humidity-controlled warehouse (20–25 °C, 40–60% RH) to preserve electrolytic capacitor formation and prevent moisture ingress into connector housings. Prior to dispatch, each drive undergoes a pre-shipment checklist covering label authenticity verification against Schneider Electric batch records, visual inspection of PCB conformal coating integrity through the ventilation slots, and connector pin condition assessment.

Packaging uses anti-static PE foam inserts within double-wall corrugated cartons, with corner protectors rated for 1.2 m drop impact per ISTA 2A. For air freight shipments, cartons are sealed with tamper-evident tape and accompanied by a packing list, commercial invoice, and certificate of origin. Standard dispatch lead time for in-stock units is 1–2 business days. Express delivery via DHL, FedEx, or UPS typically achieves door-to-door transit of 3–5 business days to Europe and North America. Sea freight consolidation is available for orders of 10 or more units, with full export documentation including HS Code 8537.10 classification. A 12-month warranty covers manufacturing defects from the dispatch date, with DOA replacement processed within 5 business days of confirmed fault report.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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