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Product Overview

The Schneider Electric ATS490C66Y is a high-current Altivar Soft Starter ATS490 designed for controlling the starting and stopping of three-phase asynchronous motors in demanding industrial applications. It is intended for process and infrastructure systems where large motors require controlled acceleration, controlled deceleration, motor protection, diagnostics, and integration with industrial automation systems.

The ATS490C66Y has a 660 A normal-duty operational current rating and a 590 A heavy-duty current rating at 40°C. It supports a motor supply range of 208 to 690 V AC and uses a 110 to 230 V AC control supply. The product supports torque-controlled starting and includes an integrated bypass.

For the model specified here, the physical dimensions are 455 × 304 × 300 mm, with a listed product weight of 28 kg. The product is intended for vertical installation and has an IP00 enclosure rating, meaning it is normally installed inside a suitable electrical cabinet or enclosure.

The ATS490C66Y is suitable for large motor applications such as pumps, fans, compressors, conveyors, mixers, and other process machinery where direct-on-line starting may produce excessive electrical or mechanical stress.

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Product Identification

Parameter	Specification
Manufacturer	Schneider Electric
Product Family	Altivar Soft Starter ATS490
Model	ATS490C66Y
Product Type	Soft Starter
Motor Type	Three-Phase Asynchronous Motor
Normal-Duty Current	660 A
Heavy-Duty Current	590 A at 40°C
Motor Supply Voltage	208–690 V AC
Control Supply	110–230 V AC
Frequency	50/60 Hz
Starting Method	Torque Control
Bypass	Integrated
Enclosure Rating	IP00
Mounting Orientation	Vertical
Dimensions	455 × 304 × 300 mm
Weight	28 kg
Application	Process and Infrastructure
Communication	Modbus Serial, Modbus TCP, EtherNet/IP
Safety Function	Safe Torque Off
Typical System	PLC / HMI / SCADA

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Technical Specifications

Technical Item	ATS490C66Y
Series	Altivar Soft Starter ATS490
Model	ATS490C66Y
Rated Operational Current	660 A
Heavy-Duty Current	590 A at 40°C
Supply Voltage	208–690 V AC
Control Voltage	110–230 V AC
Supply Frequency	50–60 Hz
Number of Phases	Three Phase
Motor Type	Asynchronous Motor
Starting Control	Torque Control
Integrated Bypass	Yes
IP Rating	IP00
Normal-Duty Power	Application and voltage dependent
Heavy-Duty Power	Application and voltage dependent
Communication	Modbus Serial / Modbus TCP / EtherNet/IP
Ethernet	100BASE-TX
Safety	STO
Height	455 mm
Width	304 mm
Depth	300 mm
Weight	28 kg
Installation	Vertical Cabinet Installation

The ATS490C66Y is rated at 660 A for normal-duty operation, while the documented heavy-duty rating is 590 A at 40°C. This distinction is important when selecting the starter for applications with demanding acceleration or load characteristics.

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What Is the Schneider ATS490C66Y?

The ATS490C66Y is a soft starter installed between the industrial power supply and a three-phase asynchronous motor.

A typical motor-control arrangement is:

Three-Phase AC Supply

↓

Circuit Breaker / Protection

↓

ATS490C66Y Soft Starter

↓

Three-Phase Motor

↓

Mechanical Load

Unlike a frequency converter, a conventional soft starter does not continuously regulate motor speed during normal operation. Its primary purpose is to manage the motor’s starting and stopping process.

This is particularly valuable for large motors because direct-on-line starting can produce high electrical current and substantial mechanical torque.

The ATS490C66Y provides controlled motor acceleration and deceleration, helping reduce stress on the motor, electrical distribution system, and connected machinery.

---

660 A Normal-Duty Rating

The ATS490C66Y is positioned in the high-current section of the ATS490 family.

Its normal-duty operational current is:

660 A

Its heavy-duty current rating is:

590 A at 40°C

The difference between these ratings is important when evaluating applications.

A motor system that operates with frequent starts, high inertia, long acceleration times, or heavy starting loads may need to be evaluated under the heavy-duty rating rather than simply using the normal-duty current.

The correct selection should consider:

• Motor rated current
• Motor voltage
• Motor power
• Starting torque
• Load inertia
• Acceleration time
• Number of starts per hour
• Ambient temperature
• Installation altitude
• Duty cycle
• Cabinet cooling

---

Motor Supply Voltage

The ATS490C66Y supports:

208–690 V AC

The supply frequency range is:

50–60 Hz

The control supply is:

110–230 V AC

These values should be compared directly with the actual electrical system before installation.

Do not select a soft starter based only on motor horsepower.

The motor nameplate current is one of the most important parameters for determining whether the starter is appropriate.

---

Motor Power Capability

The applicable motor power depends on supply voltage and operating duty.

For example, published ATS490C66Y data identifies normal-duty applications including approximately:

• 200 hp at 208 V
• 250 hp at 230 V
• 500 hp at 460 V
• 600 hp at 575 V

The same documentation lists different motor-power limits under heavy-duty conditions.

At higher supply voltages, the product can support substantially larger motor power depending on the configuration and duty.

Therefore, motor selection should always be based on the actual rated current and application duty rather than simply matching horsepower.

---

Main Functions

Controlled Starting

The ATS490C66Y manages the motor-starting process to reduce the abrupt electrical and mechanical effects associated with direct-on-line starting.

This can help reduce:

• Starting-current impact
• Mechanical shock
• Belt stress
• Coupling stress
• Gearbox stress
• Hydraulic shock
• Process disturbance

---

Torque-Controlled Starting

The ATS490C66Y uses torque control as part of its starting strategy.

This allows the starting process to be adapted more effectively to different mechanical loads.

Applications with high inertia or variable starting torque can therefore be evaluated according to their actual mechanical requirements.

---

Controlled Stopping

The ATS490C66Y can provide controlled stopping for applications where simply removing power would produce undesirable mechanical or process effects.

This can be useful for:

• Pumps
• Conveyors
• Fans
• Compressors
• Process machinery

---

Integrated Bypass

The ATS490C66Y includes an integrated bypass.

After the starting sequence is completed, the bypass arrangement allows normal motor operation without requiring the starter to continuously operate in the same high-loss starting condition.

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Motor Protection

The ATS490C66Y provides several protection functions.

These can include protection related to:

• Motor overload
• Excessive acceleration time
• Motor phase loss
• Motor underload
• Motor thermal condition
• External thermal protection
• Supply phase failure
• Line phase inversion
• Motor phase-to-earth short circuit

The exact protection behavior depends on configuration and operating conditions.

---

Safe Torque Off

The ATS490C66Y includes a Safe Torque Off (STO) function.

Published product information identifies the STO function as conforming to:

• SIL 1 according to IEC 61508
• PL c / Category 2 according to ISO 13849

STO should be incorporated into the machine safety design according to the applicable risk assessment and safety architecture.

STO should not be confused with electrical isolation. Appropriate isolation procedures are still required when performing maintenance on energized equipment.

---

Communication and Automation Integration

The ATS490C66Y can be integrated with industrial automation systems through communication protocols including:

• Modbus Serial
• Modbus TCP
• EtherNet/IP

Published technical information also identifies Ethernet communication using 100BASE-TX.

A typical architecture can be represented as:

HMI

↓

PLC

↓

Industrial Network

↓

ATS490C66Y

↓

Motor

↓

Process Equipment

Communication can be used for:

• Remote start
• Remote stop
• Status monitoring
• Fault monitoring
• Diagnostic information
• Motor data
• Parameter management
• Maintenance information

---

Industrial Applications

Pumping Systems

The ATS490C66Y can be used with appropriately rated high-power pump motors.

Typical applications include:

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

Controlled starting can help reduce sudden hydraulic changes.

Controlled stopping can also be useful where rapid pressure changes could damage piping or equipment.

---

Large Fans and Blowers

Large fans can have considerable rotational inertia.

Potential applications include:

• Industrial ventilation
• Exhaust systems
• Cooling systems
• Large blowers
• Process ventilation
• Air-handling equipment

During commissioning, monitor:

• Starting current
• Acceleration time
• Motor temperature
• Starter temperature
• Vibration
• Mechanical noise

---

Compressor Systems

Compressors can impose demanding starting conditions on motors.

Before commissioning, determine:

• Compressor pressure
• Starting load
• Motor rated current
• Starting frequency
• Acceleration time
• Mechanical condition

A compressor starting against a high process pressure can require substantially more starting torque than an unloaded compressor.

---

Conveyor Systems

High-power conveyors often require controlled acceleration because of their large mechanical inertia.

Applications include:

• Mining
• Bulk material handling
• Production lines
• Warehousing
• Material transfer
• Heavy industrial equipment

Controlled acceleration can reduce stress on:

• Conveyor belts
• Gearboxes
• Couplings
• Shafts
• Bearings

---

Mixers and Agitators

Large mixers may require significant starting torque because of material viscosity and mechanical inertia.

Before commissioning, evaluate:

• Empty-load starting
• Full-load starting
• Material viscosity
• Gearbox condition
• Motor current
• Acceleration time

---

Crushers and Heavy Machinery

Crushers, grinders, and other heavy machines can present demanding motor-starting conditions.

The starting sequence should be evaluated under the actual worst-case mechanical load.

An unloaded machine may start normally while the same machine under production load may require substantially greater starting torque.

---

Installation Guide

Step 1 – Confirm Product Identification

Verify:

Schneider Electric ATS490C66Y

Compare the model with:

• Electrical drawings
• Bill of materials
• Motor-control specifications
• Equipment documentation

The supplied dimensions are:

455 × 304 × 300 mm

The specified weight is:

28 kg

---

Step 2 – Verify Motor Data

Record the motor nameplate:

• Rated voltage
• Rated current
• Rated power
• Frequency
• Motor connection
• Service duty
• Power factor
• Starting requirements

The motor current must be compatible with the ATS490C66Y’s applicable operating-duty rating.

---

Step 3 – Determine Duty

Determine whether the application should be evaluated as normal duty or heavy duty.

Consider:

• Load inertia
• Acceleration time
• Starting current
• Number of starts
• Starts per hour
• Ambient temperature
• Continuous load
• Mechanical resistance

The ATS490C66Y provides a 660 A normal-duty rating and 590 A heavy-duty rating at 40°C.

---

Step 4 – Inspect the Starter

Before mounting, inspect the unit for:

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

Do not install visibly damaged equipment.

---

Step 5 – Plan the Cabinet

The supplied product dimensions are:

455 × 304 × 300 mm

Do not design the cabinet around only these three dimensions.

Provide additional space for:

• Power cables
• Cable bending
• Control cables
• Communication cables
• Ventilation
• Maintenance
• Inspection
• Heat dissipation

The ATS490C66Y is an IP00 device and therefore requires an appropriate enclosure for the installation environment.

---

Step 6 – Check Mounting Orientation

The ATS490C66Y is designed for vertical installation.

Maintain appropriate clearance around the device.

Do not obstruct airflow with:

• Cable bundles
• Cabinet partitions
• Other power devices
• Covers
• Filters

---

Step 7 – Evaluate Thermal Conditions

High-current motor starters can generate significant heat during starting.

Check:

• Cabinet ambient temperature
• Cooling airflow
• Fan operation
• Air filters
• Ventilation openings
• Nearby heat sources
• Starting frequency

The published ATS490C66Y data identifies significant starting losses during high-current acceleration, making cabinet thermal design particularly important for demanding applications.

---

Step 8 – Isolate Electrical Power

Before wiring:

1. Stop the machine.
2. Disconnect incoming power.
3. Isolate control power.
4. Apply lockout/tagout procedures.
5. Verify absence of hazardous voltage.
6. Discharge stored energy where applicable.
7. Prevent accidental motor startup.

Only appropriately qualified personnel should perform high-voltage installation and commissioning.

---

Step 9 – Mount the Starter

The specified product weight is:

28 kg

Verify that the cabinet mounting structure can safely support the starter and connected wiring.

Check:

• Mounting strength
• Vertical orientation
• Mechanical stability
• Vibration
• Cable weight
• Maintenance accessibility

---

Step 10 – Connect Incoming Power

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

Verify:

• Supply voltage
• Phase conductors
• Protection devices
• Cable size
• Terminal condition
• Connection integrity
• Grounding

Never assume the supply voltage without measurement.

---

Step 11 – Connect the Motor

Connect the motor according to the approved wiring design.

Verify:

• Motor terminals
• Phase conductors
• Motor cable
• Grounding
• Insulation
• Motor connection

Before the first start, verify that the mechanical system is safe to rotate.

---

Step 12 – Connect Control Circuits

Control wiring may include:

• Start
• Stop
• Enable
• Ready
• Running
• Fault
• External interlocks
• Safety circuits
• PLC control
• Auxiliary contacts

Test each required control function before normal production operation.

---

Step 13 – Connect the Communication Network

If the starter is integrated into a PLC system, configure the appropriate communication interface.

Possible protocols include:

• Modbus Serial
• Modbus TCP
• EtherNet/IP

Check:

• Network cable
• Device address
• IP address
• PLC configuration
• Communication parameters
• Network switch
• Control mode

---

Step 14 – Configure Motor Parameters

Enter the actual motor nameplate data.

Typical parameters include:

• Motor rated current
• Motor voltage
• Motor frequency
• Acceleration time
• Deceleration time
• Protection settings
• Application settings
• Communication parameters

Avoid using estimated motor data when actual nameplate information is available.

---

Step 15 – Verify Safety

Before the first start:

• Test emergency-stop circuits.
• Verify guards.
• Verify STO implementation where applicable.
• Check mechanical clearance.
• Verify motor coupling.
• Ensure personnel are clear.
• Confirm downstream equipment is ready.

STO should be treated as part of the machine safety architecture rather than as a substitute for electrical isolation.

---

Step 16 – Initial Energization

Apply power and monitor:

• Starter status
• Control supply
• Incoming voltage
• Active faults
• Ready state
• Communication status

If an unexpected fault appears, remove the start command and investigate before continuing.

---

Step 17 – Test Motor Rotation

Start the motor under controlled conditions.

Observe:

• Direction
• Acceleration
• Current
• Vibration
• Noise
• Mechanical response

If rotation is incorrect, isolate the system before changing wiring.

---

Step 18 – Test Acceleration

Observe the complete acceleration process.

Record:

• Starting current
• Acceleration time
• Motor current
• Motor temperature
• Starter temperature
• Vibration
• Fault status

The motor should reach operating speed without excessive mechanical stress or repeated protective trips.

---

Step 19 – Test Normal Load

After successful unloaded or controlled testing:

1. Apply normal load.
2. Start the motor.
3. Monitor current.
4. Monitor temperature.
5. Check vibration.
6. Verify process performance.
7. Check communication.
8. Test normal stopping.

Record representative operating values for future troubleshooting.

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Commissioning Checklist

Item	Verification
Product Model	ATS490C66Y
Normal-Duty Current	660 A
Heavy-Duty Current	590 A at 40°C
Motor Voltage	Verified
Motor Current	Verified
Motor Frequency	Verified
Motor Duty	Verified
Cabinet Size	Verified
Mounting Orientation	Verified
Cooling Clearance	Verified
Incoming Power	Verified
Motor Wiring	Verified
Grounding	Verified
Control Wiring	Verified
Communication	Verified
Motor Parameters	Configured
Safety Circuits	Tested
STO	Tested as Applicable
Motor Rotation	Tested
Acceleration	Tested
Normal Load	Tested
Stopping	Tested

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ATS490C66Y Troubleshooting Guide

Fault 1 – Motor Does Not Start

Check the following sequence:

1. Incoming power
2. Control supply
3. Starter status
4. Active fault
5. Start command
6. Stop command
7. External interlock
8. Motor wiring
9. PLC output
10. Communication

If local control works but remote control fails, investigate the PLC and communication system.

---

Fault 2 – Motor Starts but Does Not Reach Speed

Possible causes include:

• Excessive mechanical load
• Insufficient starting torque
• Incorrect motor parameters
• Excessive acceleration time
• Incorrect application configuration
• Motor problem
• Supply voltage problem
• Phase problem
• Mechanical obstruction

Measure motor current during acceleration.

If current is high while speed remains low, investigate both the motor and mechanical load.

---

Fault 3 – ATS490C66Y Trips During Acceleration

Possible causes:

• Excessive starting current
• Motor overload
• Excessive mechanical load
• Incorrect motor current setting
• Insufficient starting torque
• Phase loss
• Supply abnormality
• Thermal protection
• Excessive starting frequency
• Excessive acceleration time

Do not repeatedly reset the starter without determining the cause.

---

Fault 4 – Motor Stops Immediately

Check:

• Stop command
• PLC logic
• External interlock
• Safety circuit
• Active starter fault
• Control supply
• Communication command
• STO state

Determine whether the stop originated from the starter, PLC, or safety system.

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Fault 5 – Starter Overheats

Possible causes include:

• Excessive starting frequency
• High cabinet temperature
• Insufficient ventilation
• Blocked airflow
• Excessive current
• Incorrect duty selection
• Nearby heat-producing equipment

Check the actual temperature inside the cabinet.

---

Fault 6 – Motor Overheats

Investigate:

• Motor current
• Mechanical load
• Motor cooling
• Starting frequency
• Acceleration time
• Bearing condition
• Coupling alignment
• Shaft condition
• Supply voltage

Motor overheating is not necessarily a soft-starter fault.

---

Fault 7 – Excessive Starting Current

Check:

• Motor rated current
• Motor parameters
• Starting configuration
• Mechanical load
• Motor condition
• Supply voltage
• Acceleration profile
• Number of starts

The objective is to provide enough torque to accelerate the load while maintaining acceptable electrical and thermal conditions.

---

Fault 8 – Mechanical Shock During Startup

Check:

• Starting parameters
• Torque-control settings
• Acceleration time
• Motor parameters
• Coupling
• Gearbox
• Shaft alignment
• Load inertia

If electrical behavior is normal but the machine still experiences severe shock, inspect the mechanical system.

---

Fault 9 – Excessive Vibration

Inspect:

• Motor bearings
• Coupling
• Shaft alignment
• Gearbox
• Foundation
• Driven machine
• Mechanical balance

Compare vibration during startup with vibration during normal running.

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Fault 10 – Communication Failure

If local operation works but the PLC cannot control the ATS490C66Y, check:

Ethernet

• Ethernet cable
• Network switch
• IP address
• Subnet
• PLC configuration
• Protocol settings
• Device status

Modbus Serial

• RS-485 wiring
• Device address
• Baud rate
• Parity
• Stop bits
• Network configuration

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Fault 11 – PLC Cannot Start the Motor

If local operation is successful:

1. Check communication status.
2. Verify PLC configuration.
3. Check device addressing.
4. Verify command mapping.
5. Check PLC logic.
6. Check interlocks.
7. Verify control mode.
8. Confirm that the command reaches the starter.

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Fault 12 – Unexpected Motor Stop

Potential causes include:

• Starter protection
• Motor overload
• PLC stop command
• External interlock
• Safety circuit
• STO activation
• Communication command
• Control power interruption
• Mechanical overload
• Thermal protection

Record the starter status immediately after the event.

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Fault 13 – Intermittent Operation

Intermittent problems should be investigated using operating data.

Record:

• Fault time
• Motor current
• Motor load
• Cabinet temperature
• Starting frequency
• Supply voltage
• Starter status
• PLC status
• Communication status

If the fault occurs only after repeated starts, investigate thermal accumulation and application duty.

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Fault 14 – Fault Occurs Only Under Full Load

If the starter operates normally with no load but trips under production load, investigate:

• Mechanical load
• Motor current
• Starting torque
• Acceleration time
• Motor condition
• Process pressure
• Gearbox condition
• Conveyor loading

This pattern often indicates an application or mechanical issue rather than an immediate starter hardware failure.

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Preventive Maintenance

Visual Inspection

Inspect the ATS490C66Y periodically for:

• Dust
• Moisture
• Oil
• Corrosion
• Discoloration
• Loose wiring
• Damaged cables
• Overheating
• Mechanical damage

---

Electrical Connection Inspection

Check:

• Incoming power connections
• Motor connections
• Grounding
• Control terminals
• Communication connections

High-current loose connections can produce substantial heat and may lead to equipment damage.

---

Cooling Inspection

Maintain:

• Clean airflow paths
• Functional cabinet fans
• Clean filters
• Adequate ventilation
• Appropriate cabinet temperature

High-current starting equipment requires careful thermal management, especially where frequent starts are required.

---

Configuration Backup

Maintain records of:

• Motor parameters
• Acceleration parameters
• Deceleration parameters
• Protection settings
• Communication parameters
• Application settings
• Safety configuration

A configuration backup can significantly shorten recovery time after equipment replacement.

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ATS490C66Y in Industrial Automation

A typical automation system can be structured as:

Operator HMI

↓

PLC

↓

Ethernet / Serial Network

↓

ATS490C66Y

↓

Three-Phase Motor

↓

Industrial Process

The ATS490C66Y can provide the PLC with operating and diagnostic information.

Typical automation functions include:

• Start command
• Stop command
• Ready indication
• Running indication
• Fault indication
• Motor monitoring
• Diagnostic monitoring
• Remote parameter management
• Process interlocking

---

Compatible System Components

Component	Function
Three-Phase AC Supply	Main Motor Power
Circuit Breaker	Main Protection
Fuse System	Short-Circuit Protection
ATS490C66Y	Controlled Motor Starting
Three-Phase Motor	Mechanical Power
Motor Cable	Motor Connection
PLC	Automatic Control
HMI	Operator Interface
SCADA	Supervisory Monitoring
Ethernet Switch	Network Communication
RS-485 Network	Serial Communication
Sensors	Process Feedback
Safety System	Machine Safety
Mechanical Load	Driven Equipment

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Recommended Alternative Models

The ATS490 family includes several adjacent high-current models. The documented current classes include ATS490C48Y at 480 A, ATS490C59Y at 590 A, ATS490C66Y at 660 A, and ATS490C79Y at 790 A.

Model	Current Class	Relative Application
ATS490C48Y	480 A	Large Motor Applications
ATS490C59Y	590 A	Higher-Current Applications
ATS490C66Y	660 A	Very High-Current Applications
ATS490C79Y	790 A	Larger High-Current Applications
ATS490M10Y	1000 A	Very Large Motor Systems
ATS490M12Y	1200 A	Extremely High-Current Systems

Alternative selection must be based on the actual motor current, duty cycle, voltage, acceleration requirements, environmental conditions, and installation configuration.

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ATS490C66Y vs ATS490C59Y

Parameter	ATS490C59Y	ATS490C66Y
Product Family	ATS490	ATS490
Normal-Duty Current	590 A	660 A
Motor Supply	208–690 V AC	208–690 V AC
Control Supply	110–230 V AC	110–230 V AC
Dimensions	455 × 304 × 300 mm	455 × 304 × 300 mm
Listed Weight	19 kg	28 kg
Application Position	High-Current	Higher-Current
Bypass	Integrated	Integrated

Although the two models share the same listed dimensions and are close in the ATS490 current range, their electrical ratings and physical weights differ. The ATS490C59Y should therefore not be treated as an automatic replacement for the ATS490C66Y.

---

ATS490C66Y vs ATS490C79Y

Parameter	ATS490C66Y	ATS490C79Y
Product Family	ATS490	ATS490
Current Class	660 A	790 A
Motor Supply	208–690 V AC	208–690 V AC
Main Application	Very High-Current Motor	Larger High-Current Motor
Selection Basis	Motor Current and Duty	Motor Current and Duty

Moving to the next current class should be based on the actual application rather than simply selecting the larger unit.

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Key Advantages

660 A Normal-Duty Capacity

The ATS490C66Y provides a 660 A normal-duty operational current rating, making it appropriate for large industrial motor systems.

590 A Heavy-Duty Rating

For demanding heavy-duty applications, the documented rating is 590 A at 40°C. This distinction is important when evaluating frequent starts and high-inertia loads.

Wide Voltage Range

The 208–690 V AC motor supply range allows the starter to be applied across many industrial electrical systems.

Torque Control

Torque-controlled starting provides flexibility for applications where the motor and mechanical load require a carefully managed acceleration process.

Integrated Bypass

The integrated bypass supports normal motor operation after the starting sequence.

Motor Protection

Protection functions can monitor electrical and thermal conditions and help prevent damage caused by abnormal motor operation.

Communication Capability

Modbus Serial, Modbus TCP, and EtherNet/IP allow the starter to be integrated with industrial automation systems.

Safe Torque Off

The ATS490C66Y includes an STO function that can form part of a properly designed machine safety system.

High-Power Industrial Applications

The starter is suitable for appropriately rated large motors used in pumps, fans, compressors, conveyors, and other process and infrastructure equipment.

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Frequently Asked Questions

What is the Schneider ATS490C66Y?

The Schneider ATS490C66Y is a high-current Altivar ATS490 soft starter designed for controlled starting and stopping of three-phase asynchronous motors.

What is the normal-duty current rating?

The normal-duty operational current is 660 A.

What is the heavy-duty current rating?

The documented heavy-duty current rating is 590 A at 40°C.

What motor voltage does it support?

The ATS490C66Y supports 208–690 V AC motor supply voltage.

What is the control supply?

The specified control supply is 110–230 V AC.

What are the dimensions?

The supplied dimensions are:

455 × 304 × 300 mm

What is the weight?

The weight specified for this product listing is:

28 kg

Is the ATS490C66Y suitable for pumps?

Yes. It can be used with appropriately rated large pump motors and is particularly suitable for process and infrastructure applications.

Can it be used for conveyors?

Yes. High-power conveyor motors can benefit from controlled acceleration when the starter is correctly selected for the motor and mechanical load.

Does the ATS490C66Y have an integrated bypass?

Yes. Published specifications identify an internal bypass.

Does it support Ethernet communication?

Yes. The ATS490 platform supports Modbus TCP and EtherNet/IP in addition to Modbus Serial.

Does it provide Safe Torque Off?

Yes. The ATS490C66Y includes Safe Torque Off (STO) as a safety function.

Why does the motor fail to accelerate?

Possible causes include excessive mechanical load, insufficient starting torque, incorrect motor parameters, inappropriate acceleration settings, motor problems, phase issues, or supply abnormalities.

Why does the starter trip during startup?

Check motor current, starting configuration, mechanical load, acceleration time, supply conditions, thermal conditions, and application duty.

Why does the ATS490C66Y overheat?

Possible causes include frequent starts, excessive starting current, high cabinet temperature, insufficient ventilation, blocked airflow, or an unsuitable duty selection.

Can ATS490C59Y replace ATS490C66Y?

Not automatically. The two models have different current ratings and weights even though their listed physical dimensions are the same. The motor current, duty, and application requirements must be verified before replacement.

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Practical Diagnostic Flow

Three-Phase Supply

↓

Control Supply

↓

ATS490C66Y Status

↓

Fault Information

↓

Motor Wiring

↓

Motor Condition

↓

Mechanical Load

↓

Motor Parameters

↓

Starting Configuration

↓

PLC Command

↓

Communication

↓

Safety / STO Status

↓

Controlled Motor Test

↓

Normal Load Test

This sequence helps technicians distinguish between electrical, mechanical, configuration, automation, communication, and safety-related faults.

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Maintenance Summary

Maintenance Area	Recommended Action
Product	Schneider ATS490C66Y
Normal-Duty Current	660 A
Heavy-Duty Current	590 A at 40°C
Motor Supply	208–690 V AC
Control Supply	110–230 V AC
Dimensions	455 × 304 × 300 mm
Weight	28 kg
Mounting	Vertical
Enclosure	IP00 / Suitable Cabinet Required
Starting	Torque Control
Bypass	Integrated
Communication	Modbus / Modbus TCP / EtherNet/IP
Safety	STO
Cooling	Maintain Adequate Airflow
Wiring	Inspect Power and Control Connections
Configuration	Maintain Parameter Backup
Troubleshooting	Power → Starter → Motor → Load → PLC

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Conclusion

The Schneider ATS490C66Y Soft Starter is a high-current motor-control solution designed for large three-phase asynchronous motors in demanding industrial process and infrastructure applications. Its 660 A normal-duty rating and 590 A heavy-duty rating at 40°C place it in the higher-current range of the ATS490 family.

The starter supports 208–690 V AC motor supplies and a 110–230 V AC control supply, while providing torque-controlled starting, integrated bypass, motor protection, communication capabilities, and Safe Torque Off.

For this product listing, the physical dimensions are 455 × 304 × 300 mm, with a specified weight of 28 kg. The IP00 construction means the device should be installed within an appropriate electrical enclosure that provides suitable protection, ventilation, cable access, and maintenance space.

The ATS490C66Y is well suited to large pumps, fans, compressors, conveyors, mixers, and other high-power machines where controlled motor acceleration can reduce electrical and mechanical stress.

Successful installation depends on more than simply connecting the motor and power supply. Engineers should verify motor current, voltage, duty, acceleration requirements, environmental conditions, cabinet cooling, protection settings, control circuits, communication parameters, and machine safety functions.

During troubleshooting, technicians should follow the complete system path from power supply through the ATS490C66Y, motor, mechanical load, PLC, communication network, and safety system. This systematic approach helps identify the actual source of a fault and avoids unnecessary replacement of functioning equipment.

When properly selected, installed, configured, and maintained, the Schneider ATS490C66Y provides a robust high-current soft-start solution for demanding industrial motor-control applications.