Product Overview

The Schneider Electric ATS48C59Y 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 product family and is intended for demanding industrial applications, including heavy-duty machinery and pumping systems.

Unlike a conventional direct-on-line starter, which applies full supply voltage to the motor immediately, a soft starter controls the voltage applied during motor acceleration and deceleration. This helps reduce starting current, limit mechanical shock, and provide smoother transitions between stopped and running conditions.

The ATS48C59Y supports a supply voltage range of 208–690 V AC and has a nominal current rating (Icl) of 590 A. Its published factory-set current is 477 A. These figures describe different parameters and should not be treated as interchangeable when selecting the device for a motor application.

The unit uses torque-controlled starting, with current limitation based on the configured operating conditions. It also incorporates motor and starter thermal protection, phase-failure monitoring, and control interfaces for integration into industrial automation systems.

The ATS48C59Y is designed for applications where controlled motor starting and stopping are important to equipment operation. Typical installations include large pumps, fans, compressors, conveyors, and other machinery driven by three-phase asynchronous motors.

As the ATS48 series has been discontinued, this model is primarily relevant to existing installations, maintenance projects, and industrial spare-parts procurement. Schneider Electric identifies ATS480C59Y from the Altistart 480 family as its recommended successor. A replacement should be evaluated according to the motor, application, control architecture, and installation requirements.

Technical Specifications

Note: Motor power capability depends on supply voltage and duty classification. Refer to the manufacturer’s application tables when selecting the starter for a specific motor.

Function and Working Principle

The ATS48C59Y controls the starting and stopping process of an asynchronous motor by regulating the voltage applied to the motor during transitional operating periods.

Its main functions include torque-controlled starting, current limitation, controlled stopping, and protection monitoring.

1. Controlled Motor Starting

When a large motor starts directly across the line, it can draw a high inrush current. This sudden electrical demand may cause voltage dips and place additional stress on the electrical distribution system.

The ATS48C59Y gradually controls motor voltage during startup. This helps manage the starting current and provides a more controlled acceleration process.

The starting parameters should be adjusted according to the motor’s rated current, load characteristics, required acceleration time, and mechanical system.

2. Torque Control

The Altistart 48 uses torque-control technology to manage motor acceleration. Rather than relying only on a simple voltage ramp, the starter regulates the starting process according to the required torque behavior.

This is particularly useful for applications where sudden acceleration may create mechanical stress. Examples include pumps, conveyors, and machinery with significant inertia.

Correct configuration is important because the required starting torque varies according to the equipment and operating conditions.

3. Current Limitation

The ATS48C59Y provides current-limiting functionality to help control the electrical demand during motor startup.

The nominal current rating and factory-set current are separate specifications. The 590 A Icl rating describes the device’s nominal current capability under the manufacturer’s defined conditions, while 477 A is the published factory-set current value.

Actual current settings should be determined according to the motor’s rated current, supply conditions, application duty, and the manufacturer’s instructions.

4. Controlled Motor Stopping

The soft starter can manage motor deceleration to reduce abrupt stopping behavior.

In pump applications, controlled stopping may help reduce pressure changes in the piping system. In material-handling applications, it can support smoother equipment transitions.

The stopping method and settings must be selected according to the driven equipment. A soft starter does not provide the same continuous speed-control capability as a variable frequency drive.

5. Motor and Starter Protection

The ATS48C59Y includes thermal protection functions for the motor and starter, as well as line phase-failure protection.

These functions help identify operating conditions that may damage the motor or starter. Correct motor data, protection settings, wiring, and coordination with upstream protective devices remain essential.

Role in Industrial Automation Systems

The ATS48C59Y is typically installed in a motor control center or industrial electrical cabinet as part of a larger motor-control arrangement.

It works with circuit protection, contactors, PLCs, operator interfaces, and the motor to provide coordinated starting and stopping.

PLC Integration

A programmable logic controller can send operating commands to the soft starter and coordinate its operation with other machine components.

For example, a PLC may initiate a pump startup after receiving a process demand signal. It can also monitor starter status and respond to fault conditions.

The ATS48C59Y supports Modbus serial communication over an RS-485 interface. This allows it to exchange supported operating information with compatible control systems.

HMI and Operator Monitoring

An HMI can display motor status, operating conditions, alarms, and fault information through a suitable PLC or communication connection.

Operators may use the interface to initiate a startup sequence, stop equipment, or review diagnostic information.

The actual functions available depend on the control-system design and the communication parameters configured in the starter.

Motor Control Center Integration

The soft starter can be installed as part of a motor control center containing upstream protection, isolation devices, bypass arrangements, and control equipment.

The installation must account for the starter’s current rating, heat dissipation, ventilation requirements, and electrical clearances.

Industrial Applications

The ATS48C59Y is designed for large three-phase asynchronous motors and demanding industrial starting applications. Its 590 A nominal current rating makes it relevant to substantial motor installations, subject to the manufacturer’s voltage and duty ratings.

1. Industrial Pumping Systems

Large pumps often experience high starting torque requirements and can produce hydraulic disturbances when started or stopped abruptly.

The ATS48C59Y can provide controlled acceleration and stopping to help reduce mechanical and hydraulic stress.

Typical applications include:

• Water supply and distribution systems
• Industrial process-water pumps
• Cooling-water circulation
• Wastewater treatment equipment
• Large transfer pumps

For pump installations, engineers should evaluate the hydraulic system, pump inertia, required acceleration time, and stopping behavior before configuring the starter.

2. Industrial Fans and Blowers

Large ventilation fans and blowers may require controlled motor startup to reduce electrical and mechanical stress.

The ATS48C59Y can manage motor acceleration and support a smoother transition to normal operation.

Applications include industrial ventilation, dust extraction, air-handling equipment, and process exhaust systems.

3. Compressors

Industrial compressors frequently use high-power motors and may require controlled starting to manage mechanical loads and electrical demand.

The soft starter can help control the motor’s startup process. However, compressor unloading arrangements, restart conditions, and manufacturer-specific operating requirements must also be considered.

4. Conveyor Systems

Large conveyor systems may experience significant mechanical stress during startup, especially when carrying heavy materials.

A soft starter can help reduce abrupt acceleration and provide a more controlled starting sequence.

Typical applications include bulk-material handling, mining conveyors, industrial production lines, and material-transfer equipment.

5. Heavy Industrial Machinery

The ATS48C59Y can also be considered for other heavy-duty motor applications where controlled starting and stopping are required.

The suitability of the device depends on the motor’s rated current, starting torque, operating cycle, and environmental conditions.

Installation and System Integration

Correct installation is essential for safe operation and reliable motor starting.

1. Verify Supply Voltage and Motor Ratings

Confirm that the incoming three-phase supply is within the specified 208–690 V AC range.

Check the motor’s nameplate information, including:

• Rated voltage
• Rated current
• Rated power
• Rated frequency
• Starting requirements
• Duty cycle

The starter must be selected according to the manufacturer’s motor application tables. Do not rely on nominal current alone when evaluating compatibility.

2. Mounting and Ventilation

The supplied dimensions are 670 × 400 × 300 mm, and the listed weight is 51.4 kg.

Allow sufficient space for mounting, electrical connections, ventilation, and maintenance access. The device uses forced-convection cooling, so the required airflow must be maintained.

The IP00 enclosure rating means that the starter requires appropriate protection within the electrical installation. It should not be treated as a fully enclosed device suitable for direct exposure to dust, moisture, or accidental contact.

3. Power Wiring

Connect the incoming supply and motor conductors according to the manufacturer’s wiring diagrams.

Use appropriately rated cables, terminals, protective devices, and grounding arrangements. Power conductors must be selected according to the installation conditions and applicable electrical regulations.

4. Control Wiring

The ATS48C59Y has a 110–230 V AC control supply and configurable control inputs and outputs.

Before connecting control signals, verify the control voltage, terminal assignments, input logic, and required interlocks.

Incorrect control wiring can cause unexpected operation or prevent the motor from starting correctly.

5. Communication Configuration

For Modbus communication, configure the RS-485 network parameters, including the device address, baud rate, parity, and communication format.

Check the PLC or supervisory system’s communication settings and confirm that the correct data points are being exchanged.

Use suitable cabling and network termination practices for the RS-485 installation.

6. Commissioning and Testing

Before putting the system into service:

1. Inspect power and control wiring.
2. Confirm grounding and protective-device coordination.
3. Verify motor nameplate parameters.
4. Configure starting current and torque settings.
5. Set appropriate acceleration and stopping times.
6. Test the control signals and communication interface.
7. Verify fault responses and protection functions.
8. Record the final configuration for maintenance.

Commissioning should be performed by qualified personnel following the manufacturer’s instructions and applicable safety procedures.

Compatible System Components

The ATS48C59Y is commonly integrated with other electrical and automation equipment.

These components are examples of equipment used in a complete installation. They are not necessarily included with the ATS48C59Y.

Alternative Models and Replacement Considerations

The ATS48C59Y has been discontinued. Schneider Electric identifies the ATS480C59Y from the Altistart 480 family as its recommended replacement.

The ATS480C59Y is the manufacturer’s recommended successor, but replacement should not be treated as a simple physical substitution.

Before replacing the original unit, review:

• Motor rated current and power.
• Supply voltage and frequency.
• Starting and stopping requirements.
• Control supply voltage.
• PLC and Modbus communication settings.
• Terminal assignments and control wiring.
• Bypass contactor requirements.
• Mounting dimensions and cabinet ventilation.
• Protection coordination and commissioning procedures.

A replacement project may require control wiring modifications, parameter changes, and updated commissioning documentation.

Key Advantages

Controlled Motor Starting

The ATS48C59Y regulates the motor starting process to help manage inrush current and reduce abrupt mechanical acceleration.

Torque-Controlled Operation

Its torque-control starting method supports applications where smoother motor acceleration is important.

High Current Capability

With a nominal current rating of 590 A, the device is intended for substantial industrial motor applications within its specified operating conditions.

Motor and Starter Thermal Protection

Integrated thermal protection functions help monitor operating conditions and protect equipment against certain abnormal thermal conditions.

Modbus Communication

The RS-485 Modbus interface allows the starter to exchange supported information with compatible PLC and supervisory systems.

Industrial Application Design

The Altistart 48 family is designed for demanding applications, including heavy-duty industrial equipment and pumping systems.

Successor Availability

The ATS480C59Y provides a manufacturer-identified successor option for users planning maintenance or modernization of existing ATS48 installations.

Technical FAQs

1. What is the Schneider Electric ATS48C59Y?

The ATS48C59Y is an Altistart 48 soft starter designed for controlled starting and stopping of three-phase asynchronous motors.

2. What is the rated current of the ATS48C59Y?

Its nominal current rating (Icl) is 590 A. The published factory-set current is 477 A. These are separate specifications and should be interpreted according to the manufacturer’s documentation.

3. What supply voltage does the ATS48C59Y support?

The device supports a supply voltage range of 208–690 V AC. The exact motor power capability depends on the selected supply voltage and duty classification.

4. What types of motors can it control?

It is designed for three-phase asynchronous motors. Motor voltage, current, power, and starting requirements must be checked before installation.

5. Does the ATS48C59Y support PLC communication?

Yes. It supports Modbus serial communication through an RS-485 interface, allowing integration with compatible PLC and supervisory systems.

6. Does this model include an internal bypass contactor?

An external bypass function is available as an optional arrangement. Verify the actual installation and included accessories before assuming that a bypass contactor is supplied with the unit.

7. What protection functions are available?

The ATS48C59Y provides motor thermal protection, starter thermal protection, and line phase-failure protection. Additional system-level protection may still be required.

8. Is the ATS48C59Y still manufactured?

No. Schneider Electric lists this model as discontinued and identifies ATS480C59Y as its recommended replacement.

9. Can ATS480C59Y directly replace ATS48C59Y?

It is the recommended successor, but a replacement requires engineering verification. Compare the electrical ratings, control supply, wiring, communication configuration, mounting requirements, and application settings before installation.

10. What should buyers check when purchasing this model?

Confirm the complete catalog number, nameplate ratings, physical condition, terminal condition, cooling system, and available testing records. For used or refurbished units, also verify warranty and return conditions.

Procurement and Maintenance Recommendations

Since the ATS48C59Y is discontinued, buyers should confirm product availability and condition before placing an order.

For industrial spare-parts procurement, verify the complete model number and compare the product nameplate with the equipment documentation. Confirm that the nominal current, supply voltage, control supply, and motor application are compatible with the existing installation.

For used or surplus equipment, request photographs of the nameplate, terminals, front panel, and cooling components. Confirm whether the unit has been tested and whether optional bypass equipment or accessories are included.

During maintenance, inspect power terminals, control wiring, grounding, ventilation paths, and cooling components. Check for signs of overheating, loose connections, or contamination. Keep the electrical cabinet within the environmental conditions specified by the manufacturer.

For replacement planning, evaluate the ATS480C59Y and confirm whether the existing PLC logic, Modbus configuration, control wiring, and cabinet layout can be retained. Document all changes and complete commissioning tests before returning the motor system to normal operation.

Conclusion

The Schneider Electric ATS48C59Y Altistart 48 Soft Starter is a high-current motor starting and stopping device designed for three-phase asynchronous motors. It supports 208–690 V AC supply, has a nominal current rating of 590 A, and provides torque-controlled starting, current limitation, thermal protection, and Modbus communication.

Its applications include industrial pumping systems, fans, compressors, conveyors, and other heavy-duty machinery. Because the ATS48C59Y has been discontinued, accurate model verification and careful replacement planning are important for industrial maintenance. Schneider Electric’s recommended successor is the ATS480C59Y, subject to a complete technical compatibility review.