Product Overview

The Schneider Electric ATV320U04N4C Frequency Inverter is a compact Altivar Machine ATV320 variable speed drive designed to provide controlled motor operation in industrial automation equipment, OEM machinery, and compact machine-control systems.

This model is designed for 380–500 V AC three-phase power supplies and is suitable for motor applications in the 0.37 kW (0.5 HP) class. By converting fixed-frequency electrical power into a controlled variable-frequency output, the drive allows a connected AC motor to operate at adjustable speeds while providing controlled acceleration, deceleration, torque management, and motor protection.

The ATV320U04N4C belongs to the Compact-format version of the ATV320 family. Its specified dimensions are 105 × 142 × 158 mm, with an approximate weight of 1.2 kg. The compact enclosure is suitable for machine control cabinets where the available installation space and arrangement of electrical components need to be carefully managed.

The frequency inverter can be used with compatible asynchronous and synchronous motors and supports advanced motor-control functions. It is therefore suitable for applications that require more precise motor regulation than conventional contactor-based motor starters can provide.

Typical applications include conveyors, packaging machinery, material-handling equipment, pumps, fans, feeders, textile machines, and other automated industrial equipment.

Technical Specifications

Function and Working Principle

The ATV320U04N4C operates as a power-electronic interface between the industrial electrical supply and a connected AC motor.

The basic energy-conversion sequence can be represented as:

Three-Phase AC Input → Rectifier → DC Link → Inverter → Variable-Frequency Three-Phase Output → Motor

The incoming three-phase AC power is converted internally into DC power. The inverter stage then generates a controlled three-phase output for the motor.

By modifying the output frequency and voltage, the drive can regulate motor speed and torque according to the machine’s operating requirements.

This allows the motor to operate with:

• Adjustable speed
• Smooth acceleration
• Controlled deceleration
• Adjustable torque
• Controlled starting
• Controlled stopping
• Overload protection
• Current monitoring
• Fault detection
• Dynamic braking

The sensorless flux vector-control capability is useful for applications where the motor needs improved torque characteristics and speed regulation, especially at lower operating speeds.

For simpler applications, voltage/frequency control can also be selected according to the motor and machine requirements.

Role in Industrial Control Systems

The ATV320U04N4C normally forms part of a larger machine-control architecture.

A typical system can be arranged as:

PLC / Controller → Control Commands → ATV320U04N4C → AC Motor → Machine Mechanism

The PLC controls the machine sequence and determines when and how the motor should operate. The frequency inverter receives these commands and regulates the motor’s electrical output.

Depending on the configuration, the drive can also communicate operating information back to the controller.

Typical monitored parameters include:

• Output frequency
• Motor current
• Drive status
• Motor operating condition
• Alarm status
• Fault status
• Speed reference
• Diagnostic information

This architecture allows the frequency inverter to handle motor-control functions while the PLC manages higher-level machine logic.

The result is a modular control system in which the motor, drive, controller, sensors, and machine mechanism can each perform their specific functions.

Industrial Applications

Conveyor Systems

The ATV320U04N4C can be used to regulate small conveyor motors in production lines, packaging systems, assembly equipment, and material-handling applications.

Variable speed control makes it possible to adjust conveyor speed according to production requirements.

Packaging Machinery

Packaging equipment frequently requires adjustable motor speed for feeding, indexing, conveying, positioning, and other machine functions.

The frequency inverter can provide controlled acceleration and deceleration, helping improve machine operation.

Pumps

The drive can regulate compatible small pump motors according to process demand.

Adjusting motor speed can provide more flexible flow control than fixed-speed operation.

Fans

Industrial ventilation and cooling systems can use the drive to adjust fan speed according to airflow requirements.

Material Handling

The ATV320U04N4C can control motors used in feeders, rollers, transfer systems, and other material-handling mechanisms.

Textile Equipment

Textile machinery often requires stable and adjustable motor speeds for winding, feeding, and material movement.

OEM Machinery

The Compact-format enclosure allows machine builders to integrate the drive into control cabinets where the physical arrangement of automation equipment is an important design consideration.

Automated Production Equipment

The drive can also be used for auxiliary motor functions in automated manufacturing systems where variable speed control is required.

Installation and System Integration

Correct installation is essential for safe and reliable frequency inverter operation.

Before installation, engineers should verify:

• Three-phase supply voltage
• Motor rated voltage
• Motor rated current
• Motor power
• Motor frequency
• Grounding
• Circuit protection
• Motor cable size
• Control wiring
• Cabinet ventilation
• EMC requirements
• Communication configuration

The ATV320U04N4C is designed for 380–500 V three-phase input, so the machine’s electrical supply must be compatible with this voltage range.

Typical Installation Procedure

1. Isolate the incoming electrical power.
2. Verify that the electrical installation is de-energized.
3. Mount the frequency inverter securely.
4. Maintain suitable ventilation clearance.
5. Connect the three-phase AC input.
6. Connect the motor output.
7. Connect protective grounding.
8. Connect digital and analog control signals.
9. Connect communication cables if required.
10. Enter the motor nameplate parameters.
11. Select the appropriate motor-control mode.
12. Configure acceleration and deceleration times.
13. Configure motor protection settings.
14. Perform motor auto-tuning when applicable.
15. Verify motor rotation direction.
16. Perform a low-speed test.
17. Check communication and diagnostic signals.
18. Test the complete machine under normal conditions.

The installation should also separate high-power motor cables from sensitive control and communication wiring where appropriate.

Communication and Control Integration

The ATV320U04N4C can be integrated into industrial automation networks through its supported communication interfaces.

Modbus serial communication can be used for exchanging commands, status information, references, and diagnostic data between the frequency inverter and compatible automation controllers.

CANopen can be used in distributed machine-control systems where multiple devices need to exchange information.

Typical communication functions include:

• Start command
• Stop command
• Speed reference
• Frequency feedback
• Current monitoring
• Drive status
• Warning information
• Fault information
• Parameter access

This makes the ATV320U04N4C suitable for machines where several drives and automation components must operate under coordinated control.

Compatible System Components

The ATV320U04N4C can be integrated with various components in an industrial automation system.

The exact accessories required depend on the motor characteristics, braking requirements, electrical network, environmental conditions, and machine safety design.

Recommended Alternative Models

The following models can be considered when designing or replacing a low-power ATV320 frequency inverter.

When selecting an alternative model, engineers should consider more than the motor power rating. Input voltage, overload requirements, physical dimensions, communication requirements, mounting format, braking requirements, and machine duty should all be evaluated.

Key Advantages

• Compact Altivar Machine ATV320 design
• 0.37 kW (0.5 HP) motor rating
• 380–500 V AC three-phase input
• Three-phase AC motor output
• Compact-format enclosure
• 105 × 142 × 158 mm dimensions
• Approximately 1.2 kg weight
• Sensorless flux vector control
• Supports compatible asynchronous motors
• Supports compatible synchronous motors
• Adjustable speed and torque
• Integrated brake chopper
• Modbus serial communication
• CANopen communication
• STO safety function
• SS1 safety function
• SLS safety function
• IP20 protection
• Suitable for OEM machinery
• Suitable for industrial automation
• Flexible PLC integration
• Suitable for compact motor-control applications

Technical FAQs

What is the Schneider ATV320U04N4C?

The ATV320U04N4C is a 0.37 kW Altivar Machine ATV320 Frequency Inverter / Variable Speed Drive designed to control three-phase AC motors in industrial machinery and automation systems.

What motor power does it support?

The drive is designed for a 0.37 kW (0.5 HP) motor application.

What is the input voltage?

The ATV320U04N4C is designed for a 380–500 V AC three-phase supply.

What are the dimensions?

The specified dimensions are 105 × 142 × 158 mm.

How much does the drive weigh?

The approximate product weight is 1.2 kg.

What type of motors can it control?

The ATV320 platform supports compatible asynchronous and synchronous motors.

Does the ATV320U04N4C support vector control?

Yes. Sensorless flux vector control is available for applications requiring improved motor torque and speed performance.

Does it have a built-in brake chopper?

Yes. The drive includes an integrated brake chopper for compatible dynamic-braking applications.

Which communication protocols are supported?

The ATV320U04N4C supports Modbus serial communication and CANopen.

Can it be connected to a PLC?

Yes. The frequency inverter can be integrated with PLC-based automation systems for start/stop commands, speed references, monitoring, and fault diagnostics.

What safety functions are available?

The ATV320 platform supports Safe Torque Off (STO), Safe Stop 1 (SS1), and Safely Limited Speed (SLS) functions.

Where is the ATV320U04N4C commonly used?

Typical applications include conveyors, packaging equipment, pumps, fans, feeders, textile machinery, material-handling equipment, and compact OEM machines.

What is the difference between ATV320U04N4B and ATV320U04N4C?

Both models belong to the ATV320 family and are designed for 0.37 kW, 380–500 V three-phase applications. The primary distinction is their physical format. The ATV320U04N4B uses the Book format, while the ATV320U04N4C uses the Compact format, resulting in different dimensions and cabinet-installation characteristics.

Conclusion

The Schneider Electric ATV320U04N4C Frequency Inverter is a compact 0.37 kW variable speed drive designed for three-phase industrial motor-control applications. Its 380–500 V AC input makes it suitable for industrial electrical systems using higher-voltage three-phase supplies.

The drive combines variable frequency motor control, sensorless flux vector technology, braking capability, communication functions, and machine-oriented safety features in a Compact-format enclosure.

With specified dimensions of 105 × 142 × 158 mm and an approximate weight of 1.2 kg, the ATV320U04N4C provides a practical solution for machine builders who need flexible motor control without using a large industrial drive.

Its compatibility with PLC-based automation, Modbus and CANopen communication, and a wide range of machine components makes it suitable for conveyors, packaging machines, pumps, fans, feeders, textile equipment, material-handling systems, and other automated machinery.

For OEM manufacturers, system integrators, and maintenance engineers, the ATV320U04N4C should be selected according to the motor’s rated power and current, the 380–500 V three-phase supply, machine duty, installation space, communication requirements, braking needs, and safety architecture. When these requirements are correctly matched, the drive can provide reliable and flexible variable speed control for modern industrial automation equipment.