Schneider Electric ATV320U55N4B Altivar Machine ATV320 VFD

The Schneider ATV320U55N4B is a variable speed drive from the Altivar Machine ATV320 series, designed for synchronous and asynchronous motors. Rated at 5.5 kW (7.5 HP) for three‑phase 380–500V AC supply, this drive is housed in a compact book format, making it suitable for space‑constrained panels. The ATV320U55N4B features an output current of 14.3 A, a built‑in EMC filter, and standard I/O for integration into machine control systems. It is ideal for applications requiring high dynamic performance, such as packaging machines, material handling, and conveyors.

Electrical Specifications

• Model: ATV320U55N4B

• Power Rating: 5.5 kW (7.5 HP)

• Input Voltage: 380–500V AC, 3‑phase, 50/60 Hz

• Output Current: 14.3 A (rated)

• Output Frequency: 0–599 Hz (max.)

• Overload Capacity: 150% for 60 s, 200% for 2 s

• Compatible Motor Types: Synchronous and asynchronous motors

• Efficiency: > 95% at rated load

• Protection Rating: IP20 (UL open type)

• Mounting Type: Book format (side‑by‑side mounting)

• Dimensions (W × H × D): 150 mm × 232 mm × 175 mm

• Weight: 3.4 kg approx.

Control and Performance

The ATV320U55N4B employs sensorless vector control (open‑loop) for high torque at low speeds and stable operation across a wide speed range. It also supports V/F control for simpler applications. The drive features auto‑tuning to identify motor parameters for optimal performance. Standard I/O include: 6 digital inputs, 2 analog inputs (configurable for 0‑10V or 4‑20mA), 2 relay outputs, 1 analog output, and 2 transistor outputs. Built‑in PID regulator is available for pressure, flow, or temperature control.

Communication and Integration

The drive supports Modbus serial communication as standard. Optional communication modules (Profibus DP, DeviceNet, CANopen, EtherNet/IP, PROFINET) can be inserted into the dedicated slot. The integrated 7‑segment LED display provides basic monitoring and parameter setup. The ATV320 series is compatible with Schneider Electric’s SoMove software for configuration and commissioning via PC.

Safety Features

The ATV320U55N4B includes Safe Torque Off (STO) function compliant with IEC 61800‑5‑2, SIL 3 / PL e. The STO can be activated via the terminal strip without additional safety modules, enabling category 3 safety circuits. The drive also has short‑circuit, overvoltage, undervoltage, and thermal protection for both the drive and motor.

Environmental and Compliance

Operating temperature: -10°C to +50°C (derating above 40°C). Storage: -25°C to +70°C. Humidity: 5–95% non‑condensing. The drive is CE, UL, cUL, and RoHS compliant. It meets EMC standards for industrial environments (IEC 61800‑3).

Typical Applications

The ATV320U55N4B is used on conveyors, packaging machines, textile machinery, mixers, and compressors. Its compact book format allows mounting in tight spaces, and its modular design facilitates quick replacement in production lines.

Installation Overview

Mount the drive vertically on a flat metal surface. Maintain 50 mm clearance above and below for air circulation. Connect the mains supply to L1/L2/L3 and motor leads to U/V/W. Control wiring should be kept separate from power wiring to reduce interference. The integrated EMC filter simplifies compliance with emissions regulations.

Conclusion

The Schneider ATV320U55N4B Altivar Machine drive combines robust performance, a compact footprint, and built‑in safety features, making it a reliable choice for machine builders and system integrators.