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- Schneider
- ATV71HU55N4
- Variable Speed Drive
- France
- 295 × 187 × 175 mm
- 5.5 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Schneider ATV71HU55N4 is an Altivar 71 variable speed drive used to regulate motor operation in industrial machinery and process equipment. It forms the controlled electrical interface between the power supply and the connected motor, allowing the machine to operate with adjustable speed and controlled acceleration or deceleration.
Variable speed control is useful when a motor-driven process does not need to operate continuously at one fixed speed. Conveyors may require different transport rates, pumps may need to follow changing process demand, and production machines may require coordinated motor movement during different stages of a cycle. The drive provides the control stage needed to adapt motor operation to these changing requirements.
The ATV71HU55N4 is normally applied as part of a complete motor-control system. The drive, motor, machine controller, operator interface, protection equipment, and mechanical load should be considered together during selection, commissioning, and replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | ATV71HU55N4 |
| Product Type | Altivar 71 Variable Speed Drive |
| Product Family | Altivar |
| Series | Altivar 71 |
| Drive Function | Variable Speed Motor Control |
| System Role | Motor Speed and Torque Control |
| Control Method | Electronic Variable-Frequency Motor Control |
| Application | Industrial Motor Drives |
| Motor Interface | Three-Phase Motor |
| Control Function | Speed, Acceleration and Deceleration Regulation |
| System Integration | Industrial Machine Control System |
| Component Type | Variable Speed Drive |
| Installation | Industrial Control Cabinet / Motor Control Equipment |
| Dimensions | 295 × 187 × 175 mm |
| Weight | 5.5 kg |
Product Features
- Altivar 71 variable speed drive for industrial motor-control applications.
- Provides adjustable motor speed for machinery with changing operating requirements.
- Supports controlled acceleration and deceleration during machine cycles.
- Can be integrated with PLC-based machine-control systems.
- Suitable for conveyors, pumps, fans, material-handling equipment, and production machinery.
- Provides an electronic control stage between the electrical supply and motor.
- Supports coordinated motor operation within automated equipment.
- Allows drive parameters to be configured according to the connected motor and application.
- Can exchange operating information with the surrounding control architecture.
- Suitable for service, replacement, and retrofit work on established Altivar 71 installations.
Working Principle
The ATV71HU55N4 regulates the electrical output delivered to the connected motor based on the required operating condition. A speed reference, start/stop instruction, or other control command is received from the machine-control system or applicable drive interface.
Power Supply → ATV71HU55N4 → Controlled Motor Output → Motor → Mechanical Load
When the motor starts, the drive controls its transition toward the required operating speed. During normal operation, it adjusts the motor output according to the commanded speed and configured control parameters. When the machine needs to slow down or stop, the drive manages the corresponding deceleration sequence.
The drive can also exchange status and operating information with the wider automation system. This allows the PLC or other controller to coordinate motor operation with machine sequences and allows the HMI or supervisory system to display relevant drive status.
The actual response of the machine depends on the complete drive system. Motor characteristics, mechanical inertia, transmission components, load conditions, control parameters, and operating commands all influence performance. These factors should therefore be reviewed together when commissioning or replacing the drive.
Role in a Schneider Altivar 71 Motor Control Architecture
The ATV71HU55N4 occupies the drive layer between the machine-control system and the motor. It converts operating commands into controlled electrical motor power while providing operating and status information to the surrounding automation architecture.
| System Layer | Typical Component | Function |
|---|---|---|
| Supervisory Layer | HMI / Operator Interface | Provides operator commands and displays machine and drive status |
| Control Layer | PLC / Machine Controller | Generates speed references, start/stop commands, and process logic |
| Drive Layer | ATV71HU55N4 | Regulates electrical power supplied to the motor |
| Motor Layer | Three-Phase Motor | Converts electrical power into mechanical rotation |
| Mechanical Layer | Coupling / Gearbox / Transmission | Transfers motor movement to the machine |
| Machine Load | Conveyor / Pump / Fan / Production Equipment | Performs the required industrial process |
| Feedback / Monitoring | Sensors / Drive Status Signals | Provides operating information to the control system |
Industrial Applications
| Application | Drive Role |
|---|---|
| Conveyor Systems | Adjusts motor speed to match material transport requirements |
| Pumping Equipment | Regulates motor operation according to changing process demand |
| Industrial Fans | Controls motor speed for ventilation and process-air applications |
| Material Handling | Provides controlled movement for transport and positioning machinery |
| Packaging Machinery | Coordinates motor speed with machine operating cycles |
| Manufacturing Equipment | Regulates motor-driven mechanisms within production machinery |
| Process Equipment | Adjusts motor operation to changing process conditions |
| Automated Machinery | Integrates motor-speed control with PLC and machine-control functions |
Installation and Maintenance
- Confirm the ATV71HU55N4 model and verify that it matches the intended Altivar 71 application and existing drive configuration.
- Review the motor nameplate, electrical schematics, drive documentation, and machine-control drawings before installation.
- Isolate the incoming power and follow the approved lockout/tagout procedure before accessing the drive or motor circuit.
- Verify the electrical supply arrangement and confirm that the drive is suitable for the installed system.
- Inspect the drive, terminals, connectors, cooling areas, and accessible surfaces for damage, contamination, or signs of overheating.
- Verify motor power connections and control wiring against the approved electrical drawings.
- Check the motor, coupling, gearbox, and driven mechanism for mechanical binding or abnormal resistance before enabling the drive.
- Enter or verify the applicable motor and drive parameters according to the connected motor and machine requirements.
- Check speed references, start/stop commands, interlocks, communication connections, and feedback signals before commissioning.
- Perform a controlled initial run and verify motor direction, startup behavior, and basic speed response.
- Monitor the drive and motor for abnormal current, vibration, temperature, faults, or unexpected acceleration and deceleration during operation.
- Record the final drive parameters, motor information, wiring configuration, commissioning results, and maintenance observations for future service work.
Related Components
| Component | Function in the System |
|---|---|
| Three-Phase Motor | Converts controlled electrical power into mechanical rotation |
| Schneider Altivar 71 Control System | Provides the variable-speed drive platform |
| PLC / Machine Controller | Generates motor-control commands and process logic |
| HMI | Provides operator control and drive-status information |
| Motor Power Cable | Connects the drive output to the motor |
| Motor Protection Equipment | Provides applicable protection for the motor circuit |
| Mechanical Coupling | Transfers motor rotation to the driven mechanism |
| Gearbox | Adapts motor speed and torque to machine requirements |
| Process / Speed Sensor | Provides operating information where feedback is used |
| Control Cabinet | Houses the drive and associated electrical control equipment |
Recommended Related Models
| Model | Product Type | Typical Relationship |
|---|---|---|
| Schneider Altivar 71 Series | Variable Speed Drive | Same drive family |
| Schneider ATV71HU40N4 | Altivar 71 Variable Speed Drive | Related Altivar 71 drive model |
| Schneider ATV71 Series Drives | Variable Speed Drive | Related motor-control platform |
| Schneider Altivar Motor Drives | Variable Speed Drive | Related industrial drive family |
| Schneider Altivar Control Accessories | Drive Control Hardware | Associated drive-system components |
Key Advantages
- Altivar 71 platform for industrial variable-speed motor control.
- Supports controlled acceleration and deceleration.
- Allows motor speed to be adjusted for changing machine requirements.
- Integrates with PLC, HMI, and industrial machine-control architectures.
- Suitable for motor-driven production and process equipment.
- Supports maintenance and replacement of established Altivar 71 drive systems.
Technical FAQs
What is the primary function of the ATV71HU55N4?
The ATV71HU55N4 is a variable speed drive used to regulate the operation of a connected motor. It controls the electrical motor supply according to the required speed and machine operating conditions.
What should be verified before replacing an ATV71HU55N4?
The incoming supply, connected motor, drive configuration, control wiring, machine load, command source, and applicable feedback or communication arrangement should be checked before commissioning the replacement.
Why should the drive parameters be reviewed after replacement?
Drive parameters determine how the motor responds to commands such as starting, stopping, acceleration, deceleration, and speed reference changes. Configuration should therefore be checked against the installed motor and machine requirements rather than copied without verification.
What can cause unstable motor operation after installation?
Possible causes include incorrect motor or drive parameters, unsuitable speed references, control-wiring problems, active drive protection conditions, excessive mechanical load, or problems in the connected motor and transmission. Troubleshooting should examine the complete motor-control chain.