Schneider Electric ATV340D11N4 Variable Frequency Drive – Altivar 340

ATV340D11N4 – 11 kW Three-Phase Variable Frequency Drive in the Altivar 340 Control Architecture

The Schneider Electric ATV340D11N4 is an 11 kW (15 HP) AC variable frequency drive designed for three-phase supply networks in the 380–480 V range. Within the Altivar 340 platform, this unit occupies the mid-power segment of a drive family engineered specifically for OEM machine builders who require deterministic motor control, compact panel integration, and fieldbus flexibility without the overhead of a full-featured servo platform. The ATV340D11N4 delivers a nominal output current of 27 A and supports output frequencies from 0.5 Hz to 500 Hz, making it applicable across a broad spectrum of induction motor loads — from low-speed torque-critical conveyors to high-frequency spindle-adjacent applications.

The drive’s control topology supports both scalar V/f regulation and sensorless flux vector (SVC) control. In SVC mode, the internal motor model continuously estimates rotor flux position using measured stator current and voltage, enabling torque regulation at speeds as low as 0.5 Hz without an encoder. This is particularly relevant for applications such as screw compressors and loaded conveyors where breakaway torque requirements exceed 150% of rated motor torque.

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Technical Parameters

Hardware Logical Analysis

Power Stage Architecture: The ATV340D11N4 employs a three-stage power conversion topology: an uncontrolled diode bridge rectifier converts the three-phase AC supply to a raw DC bus; a bulk capacitor bank filters the rectified voltage to a nominal 540–680 V DC rail; and a six-switch IGBT inverter synthesizes the variable-frequency output via sinusoidal PWM. The IGBT gate drivers incorporate desaturation detection, which triggers a hardware-level shutdown within 2 µs of a short-circuit event — independent of the DSP control loop — preventing catastrophic device failure under fault conditions.

EMC Design and Conducted Emission Suppression: The integrated Class C2 EMC filter consists of a common-mode choke on the AC input lines and X/Y capacitors referenced to the PE conductor. This topology attenuates conducted emissions in the 150 kHz–30 MHz band to levels compliant with EN 61800-3 Category C2, eliminating the need for an external line filter in most industrial cabinet installations. The filter’s insertion loss is rated at ≥40 dB at 1 MHz, which is sufficient to protect adjacent 24 V DC control circuits from inverter-generated noise coupling through the supply rail.

Sensorless Vector Control (SVC) Signal Processing: The SVC algorithm executes on a dedicated DSP at a 4 kHz current control loop rate. At startup, the drive performs an auto-tuning sequence (motor resistance and inductance measurement) by injecting a low-frequency test signal into the stator windings. The measured parameters populate an internal motor model that continuously estimates rotor flux angle using a Luenberger observer. This approach achieves speed regulation accuracy of ±0.01% of rated speed without encoder feedback, which is adequate for the majority of pump, fan, and conveyor applications where closed-loop encoders add cost and maintenance burden.

Dynamic Braking Transistor: The built-in braking transistor is rated for the full DC bus voltage (up to 800 V peak) and activates when the bus voltage exceeds a programmable threshold (default: 760 V for 480 V supply). The transistor duty cycle is modulated by the drive firmware to maintain bus voltage within safe limits during motor deceleration. An external braking resistor (customer-specified based on braking power and duty cycle requirements) connects across the DC bus terminals. The drive monitors resistor thermal state via a programmable thermal model, issuing a warning before the resistor reaches its thermal limit.

Thermal Management: The drive uses a forced-air cooling design with an internal fan that activates based on heatsink temperature measured by an NTC thermistor. The fan speed is not variable — it operates at full speed whenever the heatsink exceeds the activation threshold. The heatsink is extruded aluminum with longitudinal fins optimized for vertical airflow. Minimum clearances of 100 mm above and below the drive are required to maintain rated thermal performance at 50°C ambient.

System Integration Benefits

• Native Modbus RTU without additional hardware: The RJ45 Modbus RTU port allows direct connection to any Schneider Modicon PLC or third-party Modbus master. Parameter read/write, speed reference, and run/stop commands are all accessible via standard Modbus function codes (03, 06, 16), eliminating the need for analog wiring for basic speed control.
• Fieldbus scalability via plug-in option cards: The VW3A3xxx communication card slot accepts EtherNet/IP, Profibus DP, CANopen, and DeviceNet modules without drive replacement. This allows a single drive model to be deployed across plants with heterogeneous network architectures, reducing spare parts inventory complexity.
• SoMove PC tool for parameter management: The free SoMove software (Windows) connects via USB or Modbus and supports full parameter upload/download, drive-to-drive cloning, and offline parameter file management. This reduces commissioning time on multi-drive installations and enables pre-configuration before site deployment.
• Integrated PID controller for closed-loop process regulation: The onboard PID function block accepts a process feedback signal (4–20 mA or 0–10 V) and generates a speed reference internally. This eliminates the need for an external PLC PID loop for single-variable process control applications such as pressure-regulated pump systems or temperature-controlled fan arrays.
• Programmable digital I/O for machine-level interlocking: Six programmable digital inputs support functions including run/stop, direction reversal, preset speed selection (up to 8 preset speeds), external fault injection, and PID feedback switching. Two relay outputs provide fault signaling and a programmable status output, enabling direct integration with machine safety circuits and SCADA alarm systems.
• Energy optimization function for partial-load efficiency: At partial motor load, the drive’s energy optimization algorithm reduces the stator flux level below the rated value, lowering iron losses in the motor. This function is particularly effective on fan and pump loads where the torque demand follows a quadratic speed curve, yielding measurable reductions in motor input power at speeds below 80% of rated.
• Configurable ramp profiles for mechanical load protection: Independent acceleration and deceleration ramp times (0.1–999.9 s) with selectable linear, S-curve, and U-curve profiles allow the drive to match the inertia characteristics of the driven load. S-curve ramps reduce jerk at ramp transitions, extending the service life of mechanical couplings, gearboxes, and conveyor belts.
• Comprehensive onboard diagnostics and fault logging: The drive stores the last 10 fault events with associated operating conditions (speed, current, voltage, temperature) in non-volatile memory. This fault history is accessible via the integrated keypad or SoMove software, enabling root-cause analysis without external data logging equipment and reducing mean time to repair (MTTR) in production environments.

Quality Assurance & Global Logistics

Every ATV340D11N4 unit supplied through siemensplc.com is sourced as genuine Schneider Electric OEM product. Each unit carries the original factory label with a traceable date code and serial number. Schneider Electric’s online product authentication portal can be used to verify unit authenticity prior to installation. Units are inspected upon receipt at our Xiamen, China facility: visual inspection confirms label integrity and packaging condition; a functional power-on test verifies that the drive initializes correctly and that no fault codes are present at startup.

Packaging is retained in original Schneider Electric retail cartons with molded foam inserts. Tamper-evident seals are verified intact before dispatch. For international shipments, units are double-boxed with additional void fill to withstand the mechanical stresses of air freight handling. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country.

Standard dispatch lead time from Xiamen is 1–3 business days after order confirmation. Express air freight via DHL, FedEx, or UPS delivers to most destinations in 3–7 business days. Sea freight consolidation is available for bulk orders where lead time permits. All shipments are tracked end-to-end, with tracking numbers issued at the time of dispatch. A 12-month warranty against manufacturing defects is provided from the dispatch date, covering component failure under normal operating conditions as defined in the Schneider Electric product datasheet.

Contact Information

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