Product Overview

The Schneider ATV950U40N4E is a 4 kW variable speed drive in the Altivar Process ATV900 family. It operates on a 400/480 V supply and combines an IP55 enclosure with a braking unit and switch. This configuration is suited to industrial installations where motor speed regulation, process monitoring, and local equipment isolation are part of the drive system requirements.

In a pumping application, the drive can adjust motor speed to match changing flow demand rather than relying entirely on throttling valves. In a process line, controlled acceleration and deceleration can help reduce mechanical stress on belts, couplings, and driven equipment. The braking function is relevant where the application requires controlled deceleration and the braking arrangement has been correctly configured.

The ATV950 range focuses on process-oriented motor control. Its embedded functions include power measurement, an energy dashboard, process monitoring and control, asset monitoring and protection, drift monitoring, and a Stop and Go function intended to reduce energy consumption under suitable operating conditions. These functions give maintenance and operations teams additional information about drive and process behavior alongside basic motor-speed control.

The U40 designation identifies the 4 kW power class, while N4E identifies the 400/480 V version with the braking unit and switch in the IP55 configuration. This distinction matters when comparing it with the ATV950U40N4, which is also a 4 kW, 400/480 V IP55 drive with a braking unit but has a different switching configuration.

For replacement work, confirm the installed drive’s motor rating, supply voltage, enclosure requirements, braking arrangement, control wiring, and communication configuration. A similar power rating alone does not establish that another drive can replace the existing unit without changes to the installation.

Technical Specifications

Product Features

• 4 kW motor control: Suitable for applications where the connected motor and load fall within the drive’s rated operating limits.
• 400/480 V supply class: Intended for industrial three-phase power systems within the specified voltage range.
• IP55 enclosure: Provides protection against dust ingress and water jets under the conditions defined by the enclosure rating.
• Integrated braking unit: Supports braking arrangements requiring the drive’s specified braking capability.
• Switch-equipped configuration: Includes the switching arrangement identified by the E variant.
• Process monitoring: Provides embedded functions for observing process and drive operating conditions.
• Power measurement and energy dashboard: Makes electrical consumption information available for operating review.
• Asset monitoring and protection: Supports monitoring of drive and process operating conditions.
• Drift monitoring: Helps identify changes in process behavior that warrant investigation.
• Stop and Go function: Supports reduced energy consumption in applications where operating conditions permit the function to be used.
• Industrial motor control: Regulates motor operation through the drive rather than relying solely on fixed-frequency supply operation.

Working Principle

The ATV950U40N4E controls an AC motor by regulating the electrical output supplied to the motor. Instead of running the motor continuously at the supply frequency, the drive adjusts its output according to the required speed command and configured motor-control parameters.

The basic power path is:

Three-Phase AC Supply → ATV950U40N4E → Controlled AC Output → Motor → Driven Equipment

The drive converts incoming AC power through its internal power electronics and generates a controlled output for the motor. By changing output frequency and voltage according to the selected control method, it regulates motor speed and supports the required operating behavior. Acceleration and deceleration settings determine how quickly the motor follows a changing speed reference.

In a pumping system, for example, a process demand signal can be used to adjust motor speed as flow requirements change. The resulting change in pump speed affects flow and pressure, allowing the control system to respond to process conditions. Similar principles apply to fans, conveyors, and other motor-driven equipment, although the control strategy depends on the load characteristics.

The braking unit supports applications that require controlled deceleration, subject to the selected braking arrangement and system requirements. The drive’s embedded monitoring functions provide additional operating information, but the actual process response still depends on the motor, sensors, control logic, and driven machine.

Role in an Altivar Process ATV900 Motor Control Architecture

The ATV950U40N4E is the main motor-speed control element in its drive circuit. It receives power from the distribution system, accepts operating commands and references, and supplies controlled power to the motor. Other equipment in the architecture handles isolation, protection, process measurement, supervisory control, and the mechanical load.

The exact architecture depends on the motor, load, protection design, control method, and communication requirements. Upstream protection and switching components must be coordinated with the drive and must not be selected solely from the motor power rating.

Industrial Applications

Installation and Maintenance

1. Verify the drive reference: Confirm ATV950U40N4E and check that the installed unit requires the 4 kW, 400/480 V, IP55 configuration with braking unit and switch.
2. Check the motor nameplate: Enter the motor’s rated voltage, current, frequency, speed, and other required data according to the drive configuration procedure.
3. Confirm supply compatibility: Verify the incoming three-phase supply against the drive’s permitted voltage range before energizing the unit.
4. Inspect the mounting location: Ensure that the installation surface can support the drive and that the enclosure is suitable for the surrounding environment.
5. Maintain cooling clearance: Follow the required mounting orientation and clearance conditions so heat can dissipate through the intended cooling path.
6. Check the IP55 installation conditions: Inspect cable entries, seals, enclosure closures, and mounting interfaces to prevent the installation from compromising the intended degree of protection.
7. Verify upstream protection: Check that circuit breakers, contactors where used, conductors, and protective devices are selected and coordinated for the drive installation.
8. Inspect motor and supply wiring: Confirm terminal connections, conductor sizing, earthing, and separation of power and control wiring according to the installation design.
9. Check the braking arrangement: Confirm the braking configuration and any associated components against the application’s deceleration requirements.
10. Configure the control method: Set the required speed reference, acceleration and deceleration times, operating limits, and motor-control parameters.
11. Test the operating sequence: Verify start, stop, direction where applicable, reference response, process feedback, and fault handling before returning the equipment to normal service.
12. Record commissioning data: Document motor parameters, drive settings, protection devices, communication configuration, and baseline operating values to support future troubleshooting.

Related Components

Recommended Related Models

These models cover related power ratings and configurations rather than automatic replacements. Before substitution, verify motor current, voltage, load duty, enclosure rating, switching requirements, braking needs, control interfaces, and the mounting arrangement.

Key Advantages

• Controls motor speed to match changing process demand.
• Combines a 4 kW rating with a 400/480 V supply class.
• Uses an IP55 enclosure for suitable industrial installation environments.
• Includes a braking unit and switch in the specified configuration.
• Provides embedded power measurement and process monitoring functions.
• Supports condition assessment through drive and process operating information.

Technical FAQs

What is the difference between ATV950U40N4E and ATV950U40N4?

Both are 4 kW Altivar Process ATV950 drives for 400/480 V systems with IP55 protection and a braking unit. The ATV950U40N4E includes the switch-equipped configuration, while the ATV950U40N4 has a different switching arrangement. The distinction matters when matching the drive to an existing power-distribution and isolation design.

Can the ATV950U40N4E regulate pump flow directly?

The drive can regulate pump speed, which can be used to influence flow and pressure. Direct process regulation depends on the control strategy, feedback sensor, and drive or PLC configuration. The presence of a variable speed drive alone does not establish a complete closed-loop process-control setup.

What should be checked when the drive trips during acceleration?

Review the drive fault code, motor nameplate settings, acceleration time, current limit, mechanical load, supply condition, and motor wiring. A trip during acceleration may result from excessive load, an unsuitable ramp, incorrect motor data, or an electrical fault. The recorded fault information should guide troubleshooting rather than repeatedly resetting the drive.

Does the IP55 rating mean the ATV950U40N4E can be installed outdoors without additional protection?

IP55 describes protection against dust ingress and water jets under specified test conditions. It does not by itself confirm suitability for every outdoor environment. Temperature, direct weather exposure, solar heating, condensation, corrosion, and the installation’s required clearances must also be considered.