Product Overview

The Schneider Electric ATS48C48Y Altistart 48 Soft Starter is an industrial motor-starting and stopping device designed for three-phase asynchronous motors. It belongs to Schneider Electric’s Altistart 48 series and is intended for demanding applications involving pumps, compressors, fans, conveyors, and other heavy-duty industrial machinery.

Unlike a conventional direct-on-line starter, which applies full supply voltage to the motor immediately, a soft starter controls the motor’s starting and stopping process. By managing the voltage and torque during acceleration and deceleration, it helps reduce electrical and mechanical stress on the motor and driven equipment.

The ATS48C48Y operates across a rated supply voltage range of 208–690 V AC. Its factory-set current is 414 A, while its starter current rating is specified at 480 A. It supports motor applications ranging from approximately 110 kW to 500 kW, depending on supply voltage and operating duty.

One of the main characteristics of the Altistart 48 series is its Torque Control System (TCS). This technology manages motor torque during starting and stopping to provide smoother operation and help reduce sudden mechanical movement. The soft starter also incorporates motor protection and monitoring functions for industrial operating conditions.

The ATS48C48Y supports a control supply voltage of 110–230 V AC and includes a Modbus communication interface. This allows it to be incorporated into industrial control architectures for monitoring and coordination with PLCs and other automation equipment.

The model has an IP00 protection rating and is designed for installation inside an appropriately protected electrical enclosure. Its dimensions are 670 × 400 × 300 mm, with a supplied weight of 51.4 kg.

The ATS48C48Y has been discontinued by Schneider Electric. The manufacturer identifies the ATS480C48Y from the Altistart 480 range as its recommended replacement. However, replacement selection should include a detailed review of electrical ratings, control wiring, communication requirements, and mounting arrangements.

Technical Specifications

Note: The 414 A factory-set current and 480 A starter current rating describe different specifications. Motor power capability depends on supply voltage and whether the application is standard duty or severe duty.

Function and Working Principle

The ATS48C48Y controls the starting and stopping of three-phase asynchronous motors by regulating the voltage applied to the motor during the transition between stopped and running conditions.

Its operating principle is based on controlled semiconductor switching and torque management. This allows the motor to accelerate and decelerate more gradually than it would with direct-on-line starting.

1. Controlled Motor Starting

When a motor starts directly across the supply, it can draw a high starting current. This may create voltage disturbances in the electrical network and place additional stress on mechanical components.

The ATS48C48Y controls the starting process by adjusting the motor’s electrical supply. The starter gradually increases the effective motor voltage according to the configured starting parameters.

This helps reduce sudden acceleration and can improve the stability of equipment such as pumps, compressors, and conveyor systems.

2. Torque Control System

The Altistart 48 uses Schneider Electric’s Torque Control System to manage motor torque during starting and stopping.

Rather than relying exclusively on a simple voltage ramp, torque control is intended to provide a more controlled transition between stationary and running conditions.

This is particularly useful in applications where sudden changes in motor torque can cause mechanical problems, such as belt movement, pressure fluctuations, or abrupt movement of connected equipment.

3. Current Limitation

The ATS48C48Y provides current-limiting functionality during motor starting.

By limiting the starting current according to the configured application parameters, the soft starter can help reduce the electrical impact of motor acceleration.

The actual current profile depends on motor characteristics, load conditions, supply voltage, and the selected settings. Current limitation must be configured carefully to ensure that sufficient starting torque remains available.

4. Controlled Motor Stopping

The soft starter can also control motor deceleration. This is useful in applications where an abrupt stop may create mechanical shock or process disturbances.

For example, in pumping systems, controlled stopping may help reduce pressure transients. In material-handling applications, a smoother stop can reduce sudden movement of belts and connected equipment.

The stopping method and timing should be selected according to the load characteristics and the requirements of the machine.

5. Motor Protection and Monitoring

The Altistart 48 incorporates protection and monitoring functions intended to help identify abnormal motor and starter operating conditions.

Depending on configuration, these functions can assist with monitoring motor thermal conditions, electrical faults, and starting performance.

The soft starter should be used together with correctly selected upstream protection, grounding, and other electrical safety devices. Its internal protection functions do not replace the complete protection requirements of an industrial installation.

Role in Industrial Control Systems

The ATS48C48Y can operate as part of a larger industrial motor-control system. It is generally installed between the incoming power supply and the motor, while receiving start, stop, and control commands from the machine’s control architecture.

PLC Integration

A programmable logic controller can coordinate the ATS48C48Y with sensors, valves, contactors, pumps, and other equipment.

Through suitable control wiring or Modbus communication, the PLC-based system can coordinate motor starting and stopping with the production sequence.

For example, a PLC may issue a start command when a process tank reaches a specified level or stop a pump when a pressure condition is detected.

HMI Monitoring

An HMI can provide operators with access to motor operating conditions, alarms, and process information.

When integrated through a suitable communication architecture, the HMI can display information from the soft starter or the PLC responsible for controlling it.

This allows operators and maintenance personnel to identify abnormal conditions and understand the operating status of connected equipment.

Modbus Communication

The ATS48C48Y includes a Modbus serial communication interface through an RJ45 connector.

Modbus can be used to exchange supported control and monitoring information with compatible automation equipment. Communication parameters, network wiring, device addressing, and supported functions must be configured correctly.

Where an Ethernet, Profibus, DeviceNet, or other industrial network connection is required, an appropriate gateway or communication solution may be necessary.

Coordination with Motor Protection Equipment

The soft starter should be integrated with suitable circuit protection, isolation devices, and motor protection arrangements.

These components work together to support safe motor operation and allow maintenance personnel to isolate the equipment when required.

Industrial Applications

The ATS48C48Y is designed for large industrial motors and demanding operating environments. Its current and voltage ratings make it relevant to heavy-duty equipment used in manufacturing, utilities, infrastructure, and process industries.

1. Industrial Pumping Systems

Pumps are among the main applications of the Altistart 48 series.

In large pumping installations, direct motor starting can create electrical disturbances and hydraulic pressure changes. The ATS48C48Y provides controlled starting and stopping to help reduce these effects.

Typical applications include:

• Industrial water supply systems
• Wastewater treatment plants
• Process water circulation
• Cooling-water pumping stations
• Industrial transfer pumps
• Large-scale fluid-handling systems

The appropriate starting and stopping settings depend on pump design, fluid characteristics, pipeline conditions, and system pressure requirements.

2. Industrial Compressors

Large compressors require reliable motor starting because their mechanical loads can be significant.

The ATS48C48Y can help control motor acceleration and reduce abrupt torque changes during startup.

It may be used in compatible compressor installations where the motor ratings and starting requirements fall within the soft starter’s specifications.

3. Conveyor Systems

Large conveyor systems are commonly used in mining, manufacturing, bulk material handling, and logistics facilities.

A controlled starting process can reduce sudden mechanical stress on belts, couplings, gearboxes, and connected equipment.

The soft starter can also help coordinate motor operation with other machinery through a PLC-based control system.

4. Industrial Fans and Blowers

Large ventilation fans and blowers may require controlled acceleration because of their rotating inertia.

The ATS48C48Y can provide a managed motor-starting process for suitable fan applications, helping reduce abrupt mechanical loading during startup.

Applications may include:

• Industrial ventilation systems
• Exhaust air equipment
• Process cooling systems
• Large air-handling installations
• Industrial dust collection equipment

5. Mining and Heavy Industry

Heavy industrial facilities use large motors to operate crushers, conveyors, pumps, fans, and other equipment.

The Altistart 48 series is designed for demanding motor-starting applications. Its controlled starting and stopping functions can support equipment reliability when correctly selected and configured.

6. Chemical and Process Industries

Chemical plants and process facilities often depend on large pumps, compressors, and auxiliary machinery.

The ATS48C48Y can be integrated into suitable motor-control systems to support controlled starting and stopping while allowing PLC-based process coordination.

The final selection must account for the operating environment, motor duty, electrical supply, and applicable safety requirements.

Installation and System Integration

Correct installation is essential for reliable operation of the ATS48C48Y. Because it is a high-current industrial soft starter, installation should be carried out by qualified electrical and automation personnel.

1. Verify Supply Voltage

Before installation, confirm that the electrical supply is within the specified 208–690 V AC range.

The incoming supply must be suitable for the motor and soft starter configuration. Verify the number of phases, frequency, protective devices, and electrical grounding arrangement.

Do not select the soft starter based solely on motor kilowatt rating. The motor’s rated current and application duty are essential selection criteria.

2. Confirm Motor Ratings

Check the motor nameplate for:

• Rated voltage
• Rated current
• Rated power
• Frequency
• Power factor
• Starting characteristics
• Required overload performance

The soft starter’s current rating must be appropriate for the connected motor and its operating duty.

The ATS48C48Y has a factory-set current of 414 A and a starter current rating of 480 A. These values should be interpreted according to the manufacturer’s selection documentation.

3. Panel Mounting and Ventilation

The supplied dimensions are 670 × 400 × 300 mm, and the product weighs 51.4 kg.

The soft starter is designed for vertical panel mounting. Ensure that the mounting structure can support its weight and that sufficient clearance is provided for ventilation and maintenance.

The IP00 protection rating means the unit does not provide a protective enclosure against contact with hazardous parts or environmental contaminants. It must be installed inside a suitable electrical cabinet or enclosure.

4. Power Wiring

Use conductors and electrical accessories rated for the operating current and installation conditions.

The power supply, soft starter, motor, protective devices, and grounding conductors must be connected according to the manufacturer’s wiring instructions.

Ensure that all terminals are correctly tightened and that cable routing is appropriate for the electrical environment.

5. Control Wiring

The ATS48C48Y uses a 110–230 V AC control supply.

Before connecting control signals, verify the control voltage and terminal functions. Start, stop, fault, and status signals should be coordinated with the PLC or other control equipment.

Incorrect control wiring may prevent proper starting or create unexpected equipment behavior.

6. Configure Motor and Starting Parameters

After installation, configure the motor’s rated current and other required parameters.

Set the starting torque, current limitation, acceleration time, stopping method, and protection settings according to the motor and load.

The parameters should be tested under actual operating conditions. Settings that work for an unloaded motor may not be suitable for a fully loaded machine.

7. Commissioning and Functional Testing

Before returning the system to normal operation, verify:

• Incoming supply voltage and phase sequence
• Motor wiring and grounding
• Control supply voltage
• Start and stop commands
• Acceleration and deceleration behavior
• Current limitation
• Motor protection settings
• PLC and Modbus communication
• Alarm and fault responses

Record the final parameter settings to support future maintenance and troubleshooting.

Compatible System Components

The ATS48C48Y is normally installed as part of a complete industrial motor-control system.

The components listed above are examples of equipment used in a complete installation. They are not necessarily included with the ATS48C48Y.

Alternative Models and Replacement Considerations

The ATS48C48Y has been discontinued by Schneider Electric. The manufacturer’s recommended replacement is the ATS480C48Y, from the Altistart 480 series.

Although the ATS480C48Y is the recommended successor, replacement should not be treated as a simple component exchange without engineering verification.

Before selecting a replacement, compare:

• Rated supply voltage
• Motor rated current
• Normal-duty and heavy-duty ratings
• Starting current limitation
• Torque-control functions
• Control supply voltage
• PLC control wiring
• Modbus communication settings
• Motor protection functions
• Mounting dimensions and terminal layout
• Cabinet ventilation requirements

A replacement soft starter must be selected according to the motor’s actual electrical and mechanical requirements. The current rating, overload capability, and starting performance should be reviewed before commissioning.

Key Advantages

Controlled Motor Starting

The ATS48C48Y provides controlled motor acceleration, helping reduce sudden electrical and mechanical disturbances associated with direct-on-line starting.

Torque Control Technology

Its Torque Control System helps manage motor torque during starting and stopping, making it suitable for applications where smooth mechanical transitions are important.

High-Current Industrial Capability

With a 480 A starter current rating, the ATS48C48Y is designed for large industrial motor applications.

Wide Voltage Range

The 208–690 V AC supply range supports a variety of industrial electrical installations, subject to the motor and application requirements.

Modbus Communication

The integrated Modbus serial interface allows the starter to exchange supported information with compatible automation equipment.

Motor Protection Functions

Integrated monitoring and protection functions help identify abnormal operating conditions and support equipment maintenance.

Industrial Application Flexibility

The Altistart 48 series is designed for heavy-duty industry and pump applications, including systems with large motors and demanding starting conditions.

Technical FAQs

1. What is the Schneider ATS48C48Y?

The ATS48C48Y is an Altistart 48 soft starter designed for controlled starting and stopping of three-phase asynchronous motors.

2. What is the rated voltage range?

The soft starter supports a supply voltage range of 208–690 V AC, with a specified tolerance of -15% to +10%.

3. What is the current rating of the ATS48C48Y?

Its starter current rating is 480 A. The factory-set current is 414 A. These values describe different product specifications and should not be confused.

4. What motor power can it support?

The published motor power range is approximately 110–500 kW, depending on the supply voltage and whether the application is standard duty or severe duty.

5. What control voltage does it require?

The control circuit supply voltage is 110–230 V AC. Verify the actual control wiring requirements before connecting the unit.

6. Does the ATS48C48Y support Modbus?

Yes. It includes a Modbus serial communication interface through an RJ45 connector. Communication settings must be configured to match the connected automation system.

7. What is the protection rating?

The ATS48C48Y has an IP00 rating. It must be installed in an appropriate electrical enclosure that provides the necessary protection against accidental contact and environmental contaminants.

8. Is the ATS48C48Y still manufactured?

No. Schneider Electric has discontinued this model. The manufacturer’s recommended replacement is ATS480C48Y from the Altistart 480 series.

9. Can the ATS480C48Y directly replace the ATS48C48Y?

It is the manufacturer’s recommended replacement, but the installation should still be reviewed. Check motor ratings, control wiring, communication settings, dimensions, mounting, and commissioning requirements.

10. What should be checked before purchasing a used ATS48C48Y?

Verify the complete model number, nameplate information, physical condition, power terminals, control terminals, and available testing records. For critical applications, request functional testing and confirm warranty and return conditions.

Procurement and Maintenance Recommendations

The ATS48C48Y is a discontinued industrial soft starter, so procurement requires careful model verification and supplier evaluation.

Before purchasing, confirm the complete catalog number and inspect the product nameplate. Verify the 208–690 V AC operating range, 480 A starter current rating, 414 A factory-set current, and control supply requirements.

For used or refurbished equipment, request clear photographs of the enclosure, terminals, nameplate, and internal condition where appropriate. Confirm whether the unit has been functionally tested and whether any accessories or communication components are included.

For installation and maintenance, keep the electrical cabinet clean and maintain suitable ventilation. Inspect power connections, control wiring, grounding, and the surrounding installation environment according to the manufacturer’s maintenance recommendations.

It is also advisable to keep a backup of the operating parameters and document changes made during commissioning or troubleshooting.

For replacement projects, the ATS480C48Y should be evaluated as the manufacturer’s recommended successor. A replacement plan should include electrical checks, control-system modifications where necessary, and complete functional testing before the equipment returns to service.

Conclusion

The Schneider Electric ATS48C48Y Altistart 48 Soft Starter is a high-current industrial motor-starting device designed for three-phase asynchronous motors. It supports a 208–690 V AC supply range, a 480 A starter current rating, and motor applications from approximately 110 kW to 500 kW depending on voltage and operating duty.

With its Torque Control System, current-limiting capability, motor protection functions, and Modbus communication interface, the ATS48C48Y is suitable for demanding industrial applications involving pumps, compressors, fans, conveyors, and heavy machinery.

Although this model has been discontinued, it remains relevant to maintenance and spare-parts requirements for existing Altistart 48 installations. Accurate model identification and compatibility checks are essential when sourcing the original unit or evaluating the recommended ATS480C48Y replacement.