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Product Overview

The Schneider ATS490C21Y Soft Starter is a high-power motor starting and stopping device from the Altivar Soft Starter ATS490 family. It is designed for controlling three-phase asynchronous motors in industrial automation, process equipment, infrastructure, material handling, pumping, ventilation, compression, and other applications where direct-on-line motor starting may produce excessive electrical and mechanical stress.

The ATS490C21Y provides controlled motor acceleration and deceleration while allowing the motor to transition into normal operating conditions efficiently. Its torque-based starting approach can be configured according to the characteristics of the connected motor and mechanical load.

For the supplied model information, the ATS490C21Y has the following physical characteristics:

• Product Type: Soft Starter
• Series: Altivar ATS490
• Model: ATS490C21Y
• Dimensions: 443 × 206 × 265 mm
• Weight: 19 kg
• Application: Three-phase asynchronous AC motor control

The ATS490 platform is intended for demanding industrial applications where reliable motor starting, controlled stopping, monitoring, and integration with automation systems are required.

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Product Identification

Parameter	Specification
Manufacturer	Schneider Electric
Product Family	Altivar Soft Starter ATS490
Model	ATS490C21Y
Product Type	Soft Starter
Motor Type	Three-Phase Asynchronous AC Motor
Control Method	Torque-Controlled Starting
Application	Industrial Motor Control
Installation	Electrical Control Cabinet
Dimensions	443 × 206 × 265 mm
Weight	19 kg
Typical Loads	Pumps, Fans, Compressors, Conveyors, Mixers, Process Machinery
Control System Integration	PLC, HMI, SCADA, Industrial Networks
Communication Capability	Industrial Automation Network Integration

The physical dimensions and weight above follow the product information supplied for this model.

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Technical Specifications

Technical Item	ATS490C21Y
Brand	Schneider Electric
Model Number	ATS490C21Y
Series	ATS490
Product Category	Soft Starter
Motor Application	Three-Phase AC Motors
Motor Type	Asynchronous Motor
Starting Method	Torque Control
Stopping Control	Controlled Deceleration
Installation	Cabinet / Panel
Dimensions	443 × 206 × 265 mm
Net Weight	19 kg
Typical Environment	Industrial
Automation Integration	PLC / HMI / SCADA
Communication	Industrial Communication Interfaces
Primary Function	Controlled Motor Starting and Stopping

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What Is the Schneider ATS490C21Y?

The ATS490C21Y is installed between the electrical power system and an AC motor.

A conventional motor starter may connect the motor directly to the supply. During direct starting, the motor can draw a high starting current and produce a sudden mechanical torque.

A soft starter changes this starting behavior.

A simplified system architecture is:

Three-Phase Power Supply

↓

Circuit Breaker / Protection

↓

ATS490C21Y Soft Starter

↓

Three-Phase Motor

↓

Mechanical Load

The starter gradually controls the electrical conditions applied to the motor during acceleration. This allows the motor to reach operating speed in a more controlled manner.

The ATS490C21Y can also be integrated into a plant automation architecture:

PLC / HMI / SCADA

↓

Control or Communication Network

↓

ATS490C21Y

↓

AC Motor

This makes the soft starter part of the overall motor-management system rather than simply an independent starting device.

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Main Function of the ATS490C21Y

The primary function of the ATS490C21Y is to control the starting and stopping of an AC motor.

Its major functions can be divided into several areas.

Controlled Starting

The starter manages motor acceleration instead of allowing an uncontrolled direct connection to the supply.

Controlled Stopping

The motor can be stopped according to the configured deceleration behavior.

Torque Management

Torque-oriented control can help match motor acceleration to the mechanical load.

Motor Protection

Operating conditions can be monitored to help identify abnormal motor behavior.

System Integration

The soft starter can be integrated into PLC and industrial control architectures.

Diagnostic Monitoring

Operating and fault information can be used during commissioning and maintenance.

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How the ATS490C21Y Works

The starting process can be divided into several stages.

Stage 1 – Start Command

A start command is received from a local control circuit, PLC, HMI, or another control system.

The ATS490C21Y checks the necessary operating conditions before allowing the motor to start.

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Stage 2 – Controlled Acceleration

The soft starter controls the motor during acceleration.

Instead of immediately applying the full starting condition, the starter establishes a controlled acceleration profile.

This can help reduce:

• Mechanical shock
• Coupling stress
• Belt stress
• Gearbox impact
• Hydraulic disturbances
• Starting-current effects

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Stage 3 – Motor Reaches Operating Speed

Once the motor reaches the appropriate operating condition, the starter transitions the motor into normal running operation.

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Stage 4 – Normal Operation

During normal operation, the motor drives the connected load.

The control system can monitor operating status and relevant diagnostic information.

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Stage 5 – Stop Command

When a stop command is received, the ATS490C21Y can use the configured stopping behavior.

The appropriate stopping method depends on the application.

For example:

• Pumps may require controlled stopping.
• Conveyors may require predictable deceleration.
• Fans may require gradual stopping.
• Process equipment may need a specific stopping profile.

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Industrial Applications

Pump Systems

The ATS490C21Y can be applied to appropriately sized industrial pump motors.

Typical applications include:

• Water circulation
• Industrial water systems
• Cooling systems
• Process pumps
• Transfer pumps
• Infrastructure pumping
• Water treatment equipment

Controlled acceleration can reduce sudden hydraulic changes during startup.

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Conveyor Systems

Large conveyor systems can have substantial mechanical inertia.

The ATS490C21Y can be used in:

• Belt conveyors
• Bulk material handling
• Production conveyors
• Packaging systems
• Mining equipment
• Warehouse handling systems

A controlled start can reduce sudden stress on belts, shafts, couplings, and gearboxes.

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Fan and Blower Systems

Large fans and blowers can require considerable starting torque because of their rotating inertia.

The ATS490C21Y can help establish a controlled acceleration process.

Typical applications include:

• Industrial ventilation
• Exhaust systems
• Cooling towers
• Air-handling systems
• Process ventilation
• Industrial blowers

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Compressor Applications

Compressors can present demanding motor-starting conditions.

Before selecting the ATS490C21Y for a compressor, engineers should evaluate:

• Motor rated current
• Supply voltage
• Compressor starting load
• Mechanical inertia
• Starting frequency
• Required acceleration time

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Mixer and Agitator Systems

Industrial mixers often have high mechanical inertia.

A controlled starting process can reduce the impact on:

• Shafts
• Bearings
• Gearboxes
• Couplings
• Mixing mechanisms

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Crushers and Heavy Machinery

Crushers, grinders, and other heavy process machinery may require significant starting torque.

The application should be evaluated carefully to determine whether the soft starter’s available starting characteristics are appropriate for the mechanical load.

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Installation Guide

1. Verify the Model

Before installation, confirm:

Schneider ATS490C21Y

Check the model label and compare it with the approved electrical design.

The supplied physical dimensions are:

443 × 206 × 265 mm

The listed weight is:

19 kg

Because this is a relatively large industrial starter, cabinet mounting and mechanical support should be checked before installation.

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2. Verify Motor Compatibility

Before connecting the motor, collect:

• Motor nameplate voltage
• Motor rated current
• Motor frequency
• Motor power
• Motor connection
• Motor type
• Load type
• Starting requirements

The soft starter should be selected based on actual motor current and application duty rather than motor power alone.

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3. Inspect the Device

Inspect the ATS490C21Y before installation.

Look for:

• Physical damage
• Cracked housing
• Damaged terminals
• Loose hardware
• Contamination
• Corrosion
• Signs of overheating

Do not install a device showing significant physical damage until it has been properly evaluated.

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4. Prepare the Cabinet

The cabinet should provide adequate space for:

• Starter mounting
• Power wiring
• Control wiring
• Communication wiring
• Ventilation
• Heat dissipation
• Maintenance access

The dimensions of the ATS490C21Y are:

443 mm × 206 mm × 265 mm

Allow additional clearance around the starter as required by the installation design and thermal requirements.

Do not design cabinet space using only the physical dimensions of the starter. Cable bending radius, terminals, airflow, and maintenance access must also be considered.

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5. Check Mounting Orientation

Install the starter in the required orientation.

The mounting arrangement should provide:

• Mechanical stability
• Adequate ventilation
• Accessible terminals
• Appropriate cable routing
• Sufficient maintenance space

The starter should not be installed in a position that obstructs cooling airflow.

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6. Isolate the Electrical Supply

Before wiring:

1. Disconnect the incoming power.
2. Isolate control power.
3. Apply the appropriate lockout/tagout procedure.
4. Verify that dangerous voltage is absent.
5. Prevent unintended motor startup.

Electrical installation and commissioning should be performed by qualified personnel.

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7. Install the ATS490C21Y

Secure the 19 kg unit to the cabinet mounting structure.

Check:

• Mounting hardware
• Panel strength
• Vertical alignment
• Cable access
• Terminal accessibility
• Ventilation
• Maintenance clearance

The cabinet structure should be capable of safely supporting the starter and connected cables.

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8. Connect the Incoming Power

Connect the incoming three-phase power according to the approved electrical schematic.

Before energizing, verify:

• Supply voltage
• Phase conductors
• Protective device
• Cable size
• Terminal connections
• Grounding
• Insulation

Never assume the incoming supply is suitable simply because another motor in the same facility uses the same voltage.

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9. Connect the Motor

Connect the motor according to the approved motor wiring configuration.

Check:

• Motor terminals
• Motor cable
• Ground connection
• Phase conductors
• Motor insulation
• Motor nameplate configuration

The motor should be inspected before the first startup.

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10. Connect Control Signals

Depending on the machine design, control wiring may include:

• Start command
• Stop command
• Enable
• Fault indication
• Ready indication
• External interlock
• Emergency-stop circuit
• PLC control
• Auxiliary signals

The exact terminal assignment should always be checked against the documentation applicable to the installed hardware and control architecture.

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11. Connect Communication

If the ATS490C21Y is integrated into a PLC network, configure the communication system before commissioning.

Typical automation functions include:

• Remote start
• Remote stop
• Status monitoring
• Fault monitoring
• Operating-data collection
• Diagnostic monitoring

Network configuration should be documented before the equipment is placed into production.

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12. Configure Motor Parameters

Enter the correct motor information.

Important parameters may include:

• Rated motor current
• Motor voltage
• Motor frequency
• Starting characteristics
• Acceleration
• Deceleration
• Protection settings
• Thermal settings
• Application parameters

Incorrect motor parameters can cause nuisance trips or poor starting performance.

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13. Perform Initial Energization

Before starting the motor, check:

• Incoming voltage
• Control power
• Starter status
• Motor connection
• Control signals
• Fault status
• Communication status

Do not immediately apply full mechanical load during the first test.

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14. Test Motor Rotation

Start the motor briefly under controlled conditions.

Verify that the motor rotates in the correct direction.

If the direction is incorrect, stop the system and correct the motor phase arrangement according to the approved electrical procedure.

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15. Test Acceleration

Observe:

• Acceleration time
• Motor current
• Motor noise
• Motor vibration
• Mechanical response
• Starter status
• Fault indications

If the motor fails to accelerate correctly, stop the test and investigate before applying additional load.

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16. Test Normal Operation

After a successful unloaded or lightly loaded test:

1. Apply the normal process load.
2. Start the motor.
3. Observe acceleration.
4. Monitor current.
5. Monitor temperature.
6. Check mechanical behavior.
7. Verify PLC communication.
8. Confirm fault handling.

Record important commissioning values for future maintenance.

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Commissioning Checklist

Item	Check
Model ATS490C21Y Confirmed	✓
Dimensions Verified	✓
Motor Voltage Verified	✓
Motor Current Verified	✓
Motor Power Verified	✓
Application Duty Verified	✓
Cabinet Space Verified	✓
Mounting Orientation Verified	✓
Ventilation Verified	✓
Power Wiring Checked	✓
Motor Wiring Checked	✓
Grounding Checked	✓
Control Wiring Checked	✓
Communication Checked	✓
Motor Parameters Entered	✓
Initial Energization Completed	✓
Rotation Direction Checked	✓
Acceleration Tested	✓
Normal Operation Tested	✓
Fault Handling Tested	✓

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Troubleshooting Guide

ATS490C21Y Does Not Start the Motor

If the motor does not start, troubleshoot the complete control chain.

Check:

1. Incoming power
2. Control power
3. Start command
4. Stop command
5. External interlocks
6. Active faults
7. Motor wiring
8. Motor condition
9. Control configuration
10. PLC communication

Do not immediately assume that the soft starter has failed.

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Motor Starts but Does Not Accelerate

This condition can indicate a problem with the starting configuration or mechanical load.

Inspect:

• Motor rated current
• Starting settings
• Mechanical load
• Motor condition
• Supply voltage
• Phase condition
• Acceleration configuration
• Coupling
• Gearbox

A heavily loaded motor may require more starting torque than the configured starting profile can provide.

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Motor Trips During Acceleration

Potential causes include:

• Excessive mechanical load
• Incorrect motor-current setting
• Insufficient starting torque
• Excessive acceleration time
• Motor fault
• Supply abnormality
• Phase loss
• Thermal protection
• Incorrect application selection

Record the fault condition and motor operating behavior before resetting the starter.

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Starter Overheats

Possible causes include:

• Excessive starting frequency
• High cabinet temperature
• Poor ventilation
• Blocked airflow
• Excessive motor current
• Incorrect application sizing
• Loose electrical connections
• Excessive mechanical load

Check the cabinet thermal environment before replacing the starter.

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Motor Overheats

A motor overheating problem may originate from the motor, starter, or mechanical system.

Check:

• Motor current
• Motor load
• Starting frequency
• Acceleration time
• Motor cooling
• Voltage balance
• Motor bearings
• Mechanical friction

Do not repeatedly reset a thermal-related fault without investigating the cause.

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Motor Stops During Normal Operation

Check:

• Stop command
• PLC logic
• External interlock
• Starter fault
• Motor protection
• Thermal condition
• Supply voltage
• Mechanical overload
• Communication status

If the motor stops without a visible fault, examine the PLC sequence and external control circuit.

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Excessive Starting Current

A high starting current can result from:

• Incorrect configuration
• Excessive motor load
• Incorrect motor parameters
• Motor problems
• Supply conditions
• Application mismatch

Measure the current during different stages of acceleration to determine when the abnormal behavior begins.

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Excessive Mechanical Shock

If the machine experiences a strong mechanical impact during startup, inspect:

• Acceleration configuration
• Torque settings
• Motor parameters
• Mechanical coupling
• Gearbox
• Load characteristics

The objective is to establish a controlled acceleration profile suitable for the specific machine.

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Motor Vibration

Vibration should not automatically be attributed to the soft starter.

Inspect:

• Motor bearings
• Coupling
• Shaft alignment
• Gearbox
• Mechanical balance
• Mounting
• Load
• Motor condition

If vibration occurs only during acceleration, compare it with the motor’s normal running condition.

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Communication Failure

When the motor can operate locally but the PLC cannot control or monitor the starter, investigate the communication system.

Check:

• Network cable
• Communication interface
• Network address
• IP configuration
• PLC configuration
• Device configuration
• Communication parameters
• Industrial switch
• Network topology
• Control program

A communication fault does not necessarily indicate a power-stage failure.

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Intermittent Faults

Intermittent faults are often more difficult to diagnose.

Record:

• Time of occurrence
• Motor load
• Ambient temperature
• Starting frequency
• Motor current
• Fault message
• PLC status
• Communication status
• Cabinet temperature

Compare fault occurrences with operating conditions.

For example, if the problem only occurs after several consecutive starts, thermal accumulation may be more relevant than an isolated wiring fault.

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Unexpected Restart

If the motor unexpectedly restarts, immediately investigate the control system.

Potential areas include:

• PLC logic
• Start command
• Automatic restart configuration
• Control wiring
• Communication commands
• External interlocks
• Operator commands

Unexpected starting is a serious machine-control issue and should be investigated before returning the equipment to normal operation.

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Preventive Maintenance

Visual Inspection

Regularly inspect the ATS490C21Y for:

• Dust
• Oil
• Moisture
• Corrosion
• Discoloration
• Loose wiring
• Damaged cables
• Abnormal heating

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Electrical Inspection

Check:

• Power connections
• Motor connections
• Grounding
• Control terminals
• Protective devices
• Cable insulation

Loose power connections can create localized heating and unreliable operation.

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Thermal Inspection

Monitor:

• Cabinet temperature
• Starter temperature
• Motor temperature
• Ventilation
• Cooling paths

A high-current soft starter should not be installed in a cabinet where heat from neighboring equipment significantly reduces the available thermal margin.

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Parameter Backup

Keep a record of:

• Motor parameters
• Starting parameters
• Stopping parameters
• Protection settings
• Communication settings
• Application configuration

A configuration backup can significantly reduce downtime after a device replacement.

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ATS490C21Y in Industrial Automation

The ATS490C21Y can be integrated into a larger automation system.

A typical architecture is:

Operator HMI

↓

PLC

↓

Industrial Network

↓

ATS490C21Y

↓

Three-Phase Motor

↓

Industrial Machine

The PLC can manage:

• Start/stop commands
• Operating status
• Fault status
• Motor sequence
• Process interlocks
• Maintenance alarms
• Production logic

This architecture is useful for centralized motor management in factories and process plants.

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Compatible System Components

Component	Function
Three-Phase AC Supply	Provides Motor Power
Circuit Breaker	Short-Circuit and Electrical Protection
ATS490C21Y	Controlled Motor Starting
AC Motor	Mechanical Power
Motor Cable	Motor Power Connection
PLC	Automation Control
HMI	Operator Interface
SCADA	Supervisory Monitoring
Industrial Network	Communication
Safety Circuit	Machine Protection
Sensors	Process Feedback
Contactors / Relays	Auxiliary Control
Mechanical Load	Driven Equipment

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Recommended Alternative Models

The correct alternative should be selected according to motor current, voltage, duty, application, mounting arrangement, and control requirements.

Model	Product Type	Application Position
ATS490C11Y	ATS490 Soft Starter	Lower-current motor applications
ATS490C14Y	ATS490 Soft Starter	Medium-current motor applications
ATS490C17Y	ATS490 Soft Starter	Higher-current motor applications
ATS490C21Y	ATS490 Soft Starter	Higher-power industrial motor applications
ATS490 Series Larger Frame	ATS490 Soft Starter	Higher-current applications

An alternative model should not be selected solely because its physical dimensions appear similar. Motor current and duty classification are the most important selection factors.

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Key Advantages of the ATS490C21Y

Controlled Motor Starting

The ATS490C21Y provides a controlled acceleration process that can reduce the sudden electrical and mechanical impact associated with direct motor starting.

Improved Mechanical Protection

Controlled acceleration can reduce stress on:

• Shafts
• Bearings
• Couplings
• Gearboxes
• Belts
• Pumps
• Conveyor components

Suitable for Industrial Equipment

The ATS490 platform is intended for industrial process and infrastructure applications.

Automation Integration

The starter can be incorporated into PLC, HMI, SCADA, and industrial communication systems.

Diagnostic Capability

Operating and fault information can help maintenance engineers identify abnormal conditions.

Compact Industrial Construction

Despite its relatively high-power application range, the supplied dimensions are 443 × 206 × 265 mm, with a listed weight of 19 kg, making cabinet planning straightforward when adequate mounting and ventilation space are provided.

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Frequently Asked Questions

What is Schneider ATS490C21Y?

The Schneider ATS490C21Y is an Altivar ATS490 series soft starter designed for controlled starting and stopping of three-phase asynchronous AC motors.

What is the ATS490C21Y used for?

It is used to control motor acceleration and stopping in applications such as pumps, fans, conveyors, compressors, mixers, and other industrial machinery.

What are the dimensions of ATS490C21Y?

The supplied dimensions are:

443 × 206 × 265 mm

How much does the ATS490C21Y weigh?

The supplied product weight is:

19 kg

Is ATS490C21Y suitable for PLC systems?

Yes. The ATS490 platform is designed for integration into industrial automation systems and can be incorporated into PLC-based motor-control architectures.

Can ATS490C21Y be used with pumps?

Yes, provided the motor current, supply voltage, starting characteristics, and application duty are within the starter’s applicable ratings.

Can ATS490C21Y be used for conveyors?

Yes. It can be suitable for conveyor applications where controlled motor acceleration is beneficial, provided the motor and mechanical load are properly evaluated.

Why does the motor trip when starting?

Possible causes include excessive mechanical load, insufficient starting torque, incorrect motor parameters, supply abnormalities, motor faults, or protection settings.

Why does the starter overheat?

Common causes include excessive starting frequency, high ambient temperature, poor cabinet ventilation, excessive current, or incorrect application sizing.

Why does the motor not reach normal speed?

Possible causes include excessive mechanical load, insufficient starting torque, incorrect motor parameters, motor problems, or mechanical obstruction.

How should the ATS490C21Y be maintained?

Regular inspection should include cabinet ventilation, power connections, motor connections, grounding, environmental conditions, configuration backup, and abnormal temperature or vibration.

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Practical Fault-Diagnosis Sequence

When troubleshooting an ATS490C21Y installation, use a structured approach rather than replacing components immediately.

Step 1 — Check Power

Verify incoming power and control power.

↓

Step 2 — Check Starter Status

Look for active faults, warnings, or abnormal operating conditions.

↓

Step 3 — Check Motor

Inspect motor wiring, insulation, bearings, and mechanical condition.

↓

Step 4 — Check Load

Determine whether the mechanical load is excessive or obstructed.

↓

Step 5 — Check Parameters

Verify motor and starting configuration.

↓

Step 6 — Check Control

Verify PLC, HMI, start/stop commands, and interlocks.

↓

Step 7 — Check Communication

Verify network configuration and communication status.

↓

Step 8 — Test Under Controlled Conditions

Perform a controlled restart and record operating values.

This sequence helps separate electrical, configuration, mechanical, and communication problems.

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Installation and Troubleshooting Summary

Area	Main Point
Product	Schneider ATS490C21Y
Series	Altivar ATS490
Function	AC Motor Soft Starting
Motor Type	Three-Phase Asynchronous Motor
Dimensions	443 × 206 × 265 mm
Weight	19 kg
Installation	Electrical Control Cabinet
Main Applications	Pumps, Fans, Conveyors, Compressors, Mixers
Starting Method	Controlled Motor Acceleration
Troubleshooting Priority	Power → Starter → Motor → Load → Parameters → Control
Maintenance Priority	Cooling, Wiring, Motor, Configuration, Diagnostics

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Conclusion

The Schneider ATS490C21Y Soft Starter is an industrial motor-control device designed to provide controlled starting and stopping for three-phase asynchronous motors. It is particularly useful in applications where direct starting can create excessive mechanical shock, high starting stress, or undesirable process disturbances.

With supplied dimensions of 443 × 206 × 265 mm and a weight of 19 kg, the ATS490C21Y requires appropriate cabinet support, ventilation, cable clearance, and maintenance access during installation.

Successful commissioning depends on correctly matching the starter to the motor and application. Motor current, supply voltage, load characteristics, starting frequency, acceleration requirements, environmental conditions, and control architecture should all be evaluated before operation.

For troubleshooting, a systematic approach is recommended. Power supply, control signals, starter status, motor condition, mechanical load, configuration, and communication should be checked in sequence. This prevents unnecessary component replacement and helps identify the actual cause of a motor-starting or operating problem.

When correctly selected, installed, configured, and maintained, the ATS490C21Y provides a practical solution for controlled motor starting in industrial automation, process equipment, infrastructure systems, and heavy-duty motor applications.