LTI MOTION SO24.007.0070.0101.1 AC Servo Drive – SO24 Series

LTI MOTION SO24.007.0070.0101.1 — Compact AC Servo Drive for Closed-Loop Motion Control

The LTI MOTION SO24.007.0070.0101.1 is a single/three-phase AC servo amplifier from the SO24 compact drive series, rated at 7.0 A continuous output current with a 200–240 V AC supply range. Designed for deterministic closed-loop position, velocity, and torque control, this unit addresses the core requirement of industrial motion axes: stable current regulation under dynamic load transients with minimal latency between command input and shaft response.

The SO24 platform was engineered to occupy minimal DIN-rail or panel footprint while sustaining full rated current without forced-air cooling in standard ambient conditions up to 45 °C. This thermal architecture relies on an internal heat spreader bonded to the power stage IGBT module, channeling junction heat to the rear heatsink fin array — a passive dissipation strategy that eliminates fan-bearing wear as a failure mode in continuous-duty installations.

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Technical Parameters

Hardware Logical Analysis

Current Loop Architecture: The SO24.007.0070.0101.1 implements a cascaded control structure with an inner current (torque) loop executing at the PWM interrupt rate — nominally 8 kHz, yielding a 125 µs current loop cycle time. This bandwidth is sufficient to suppress torque ripple caused by motor cogging below the mechanical resonance frequency of most servo axes in the 1–10 kg·m² inertia range. The current regulators use PI compensation with anti-windup clamping, preventing integrator saturation during current limit events such as rapid direction reversals.

Feedback Signal Conditioning: The resolver interface employs a dedicated R/D (resolver-to-digital) converter IC that generates a 10 kHz excitation carrier and demodulates the sin/cos return signals into a 16-bit digital position word. This approach provides absolute single-turn position within the resolver electrical cycle without battery backup, making it inherently suitable for environments where encoder battery maintenance is impractical. The incremental encoder input accepts differential RS-422 signals up to 1 MHz line frequency, supporting encoders with up to 2,500 PPR at 24,000 RPM without interpolation loss.

EMC Design: The power stage layout separates the high-dV/dt IGBT switching node from the signal ground plane using a split-ground PCB topology. Common-mode chokes are integrated on the motor output lines to attenuate conducted emissions on the motor cable shield. The DC bus capacitor bank is positioned to minimize loop inductance between the capacitors and IGBT bridge, reducing voltage overshoot during switching transitions — a factor that directly affects long-term IGBT reliability under repetitive load cycles.

Braking Energy Management: An internal braking chopper activates when the DC bus voltage exceeds a programmable threshold (typically 390–420 V DC for a 230 V AC supply). The chopper duty cycle is modulated to dissipate regenerative energy through an external braking resistor. For vertical axes or high-inertia loads, the external resistor must be sized to absorb the peak regenerative power during deceleration ramps — a calculation that requires knowledge of load inertia, deceleration rate, and duty cycle.

Parameter Storage: Drive configuration is stored in non-volatile EEPROM, retaining all tuning parameters, I/O assignments, and motion profiles across power cycles without a backup battery. This eliminates the risk of parameter loss during unplanned power interruptions in 24/7 production environments.

System Integration Benefits

• Deterministic Velocity Loop Response: The velocity loop executes at 1 ms cycle time, providing a −3 dB bandwidth of approximately 200 Hz in typical servo axis configurations. This bandwidth supports following error suppression at feed rates up to 60 m/min on ballscrew axes with 5 mm pitch.
• Multi-Feedback Compatibility: A single hardware platform supports resolver, incremental encoder, and SinCos encoder feedback without hardware modification — reducing spare-parts inventory and simplifying motor substitution during maintenance windows.
• Fieldbus Synchronization: When operating over EtherCAT with distributed clock synchronization, the SO24 achieves axis-to-axis jitter below 1 µs, enabling electronic gearing and cam synchronization across multi-axis gantry and flying-shear applications.
• Integrated Motion Sequencer: The SO24 platform supports onboard motion program storage, allowing the drive to execute point-to-point moves autonomously without continuous PLC intervention — reducing fieldbus bandwidth consumption in high-axis-count systems.
• Diagnostic Transparency: Fault codes are logged with timestamp and operating-state context (speed, current, temperature at fault moment), enabling root-cause analysis without oscilloscope instrumentation. The drive’s parameter interface exposes real-time current, velocity, position error, and thermal margin via the fieldbus or RS-232 service port.
• Safe Torque Off (STO) Readiness: The SO24 series incorporates hardware-level STO input circuitry compliant with EN 13849-1 PLd / SIL 2, allowing integration into safety-rated machine stop circuits without an external contactor on the motor output — reducing cabinet wiring complexity and contactor wear.
• Thermal Derating Transparency: An internal NTC thermistor monitors heatsink temperature and reports thermal margin via the service interface. The drive initiates a controlled current derating at 80% of the thermal limit, providing a predictable performance reduction rather than an abrupt fault trip — preserving production continuity in high-ambient installations.
• Compact Panel Footprint: The SO24 series achieves a power density that allows 7.0 A rated axes to be mounted in standard 60 mm panel width allocations, enabling higher axis density in multi-axis control cabinets compared to conventional servo drive form factors at equivalent current ratings.

Quality Assurance & Global Logistics

Every LTI MOTION SO24.007.0070.0101.1 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification sequence. Units are sourced through documented supply channels with traceable lot records. Label integrity, serial number format, and housing condition are inspected against LTI MOTION factory reference standards. Where stock condition permits, a power-on self-test is performed to confirm that the drive initializes without fault codes and that the parameter EEPROM is intact.

Packaging uses anti-static PE foam inserts within double-wall corrugated cartons, with silica gel desiccant packs and a humidity indicator card. This packaging specification is designed to withstand the mechanical shock and humidity exposure typical of air freight transit from Xiamen Gaoqi International Airport to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East.

Standard dispatch is via DHL Express, FedEx International Priority, or UPS Express Saver, with transit times of 3–7 business days to most destinations. Full export documentation is provided: commercial invoice, packing list, HS code declaration (HS 8537.10 or 8504.40 as applicable), and certificate of conformity. For orders requiring expedited customs clearance, we coordinate with freight forwarders experienced in industrial electronics import procedures.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with a documented fault description and, where required, return of the unit to our Xiamen facility for inspection. Replacement units are dispatched within 5 business days of fault confirmation.

Contact Information

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