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The Schneider ATS490C25Y Soft Starter is a high-current motor control device in the Altivar Soft Starter ATS490 family. It is designed for controlled starting and stopping of three-phase asynchronous motors used in industrial process and infrastructure applications.
The ATS490C25Y is rated at 250 A in normal-duty operation and supports motor supplies from 208 to 690 V AC. Its control supply range is 110 to 230 V AC. The unit incorporates torque-based motor starting, internal bypass, motor and application monitoring, and industrial communication capabilities.
The physical dimensions supplied for this model are 443 × 206 × 265 mm, with a listed weight of 19 kg. These dimensions correspond to a height of 443 mm, width of 206 mm, and depth of 265 mm.
The ATS490C25Y is intended for applications including pumps, fans, compressors, conveyors, mixers, cutters, grinders, and crushers. Its design is particularly useful where a conventional direct-on-line starting method could create excessive starting current or mechanical stress.
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | ATS490C25Y |
| Product Family | Altivar Soft Starter ATS490 |
| Product Type | Soft Starter |
| Normal-Duty Operational Current | 250 A |
| Motor Supply Voltage | 208–690 V AC |
| Control Supply | 110–230 V AC |
| Motor Type | Three-Phase Asynchronous Motor |
| Starting Method | Torque Control |
| Internal Bypass | Yes |
| Dimensions | 443 × 206 × 265 mm |
| Weight | 19 kg |
| Installation | Vertical, Inside Enclosure |
| Communication | Modbus Serial, Modbus TCP, EtherNet/IP |
| Ethernet Interface | 100BASE-TX |
| Serial Interface | 2-Wire RS-485 |
| Typical Applications | Process and Infrastructure |
| Enclosure Rating | IP00 |
The 250 A rating, 208–690 V AC motor supply range, 110–230 V AC control supply, internal bypass, communication interfaces, and physical dimensions are documented for the ATS490C25Y.
| Technical Item | ATS490C25Y |
|---|---|
| Brand | Schneider Electric |
| Series | Altivar ATS490 |
| Model | ATS490C25Y |
| Rated Current | 250 A Normal Duty |
| Supply Voltage | 208–690 V AC |
| Frequency | 50/60 Hz |
| Phase | Three Phase |
| Motor Type | Asynchronous Motor |
| Control Supply | 110–230 V AC |
| Starting Control | Torque Control |
| Internal Bypass | Integrated |
| Communication Protocols | Modbus Serial / Modbus TCP / EtherNet/IP |
| Physical Communication | RS-485 / 100BASE-TX |
| Display | Available |
| Mounting Position | Vertical ±10° |
| Height | 443 mm |
| Width | 206 mm |
| Depth | 265 mm |
| Weight | 19 kg |
| Installation | Inside Enclosure |
| Typical Applications | Process and Infrastructure |
The ATS490C25Y belongs to the larger ATS490 frame group shared by the C21Y and C32Y references, with catalog dimensions of 206 × 443 × 265 mm.
The ATS490C25Y is installed in the motor power circuit to control how a three-phase AC motor starts and stops.
A simplified arrangement is:
Three-Phase AC Supply
↓
Circuit Breaker / Protection
↓
ATS490C25Y Soft Starter
↓
Three-Phase Motor
↓
Mechanical Load
During a conventional direct-on-line start, an AC motor can draw a substantial starting current and generate a sudden torque response.
The ATS490C25Y instead provides controlled motor acceleration.
This can help reduce:
The ATS490 family is specifically designed for asynchronous motors and process/infrastructure applications.
The ATS490C25Y performs several important functions in an industrial motor-control system.
The starter controls motor acceleration according to the configured starting profile.
The motor can be stopped using controlled deceleration functions when the application requires a smoother stop.
Torque-oriented control allows the starting process to be adapted to the mechanical characteristics of the driven equipment.
The ATS490C25Y includes an integrated bypass, allowing the starter to transition to an efficient running condition after the starting sequence.
The ATS490 platform provides monitoring functions covering motor, application, power, and energy conditions.
The starter supports Modbus Serial, Modbus TCP, and EtherNet/IP communication.
One of the most important specifications of the ATS490C25Y is its 250 A normal-duty operational current rating.
The model is intended for motors whose actual operating requirements fall within the applicable starter ratings.
Motor selection should not be based only on horsepower or kilowatts.
Before installation, verify:
For the ATS490C25Y, published selection information identifies a normal-duty current rating of 250 A and motor power capability that varies according to supply voltage.
The ATS490C25Y supports motor supplies from:
208 to 690 V AC
This broad voltage range allows the same soft-starter family to be used across different industrial electrical systems.
However, the motor’s actual nameplate voltage must always be checked before commissioning.
The ATS490C25Y uses a control supply range of:
110–230 V AC
The control power circuit should be designed and protected according to the approved electrical schematic.
Do not confuse the control supply with the motor power supply.
The motor power circuit operates at a much higher voltage range, while the control supply is used to power the starter’s control electronics.
A start command is received from:
The ATS490C25Y evaluates the configured operating conditions.
The soft starter manages the motor acceleration.
The objective is to provide enough torque to accelerate the mechanical load while avoiding unnecessary electrical and mechanical stress.
As the motor approaches normal operation, the starter completes the starting sequence.
The integrated bypass allows the motor to operate through the appropriate running path after starting.
During normal operation, the starter can monitor relevant motor and application information.
When a stop command is received, the configured stopping behavior is applied.
This can be particularly useful for pumps, conveyors, and process machinery where an abrupt stop may negatively affect the machine or process.
The ATS490C25Y can be used for suitably sized industrial pump motors.
Potential applications include:
Controlled starting can help reduce sudden hydraulic disturbances.
Large fans and blowers often have considerable rotating inertia.
The ATS490C25Y can provide controlled acceleration for:
Compressors can place significant demands on motor starting.
Before commissioning a compressor application, verify:
The ATS490 family is intended for conveyor applications.
Typical examples include:
Controlled acceleration can reduce stress on belts, couplings, shafts, and gearboxes.
Mixers and agitators can have high starting inertia.
The ATS490C25Y can be considered for suitably sized systems where controlled motor acceleration is beneficial.
The ATS490 range also covers applications such as cutters, grinders, and crushers.
These machines should be evaluated carefully because starting torque requirements can be significantly higher than those of lightly loaded fans or pumps.
Verify the nameplate:
Schneider Electric ATS490C25Y
Confirm that the installed model matches the engineering documentation.
Physical specifications:
443 × 206 × 265 mm
19 kg
Collect the motor nameplate information:
Compare the motor requirements with the ATS490C25Y rating before connecting power.
Before installation, inspect the unit for:
Do not energize equipment that has obvious physical damage.
The ATS490C25Y must be installed inside an enclosure with appropriate cooling and clearance.
The unit dimensions are:
Height: 443 mm
Width: 206 mm
Depth: 265 mm
The actual cabinet should provide additional space for:
The ATS490C25Y is designed for vertical installation within an enclosure, approximately ±10°.
Cooling is particularly important for a 250 A soft starter.
Check:
The ATS490 installation arrangement is designed to allow cooling air to circulate from the bottom toward the top of the starter.
Do not install the starter directly above a significant heat source.
Before electrical work:
Only qualified personnel should perform the electrical installation.
The starter weighs 19 kg.
Verify that the cabinet mounting structure can safely support:
Secure the device firmly and maintain the required cooling clearances.
The ATS490C25Y power terminals are arranged for:
as incoming supply connections, with:
connected toward the motor.
The exact wiring arrangement must follow the approved installation documentation for the actual system.
Connect the protective grounding conductor according to the electrical design.
Verify:
Never omit protective grounding.
Connect the motor to the starter’s output terminals.
Before energizing:
Control circuits can include:
The ATS490 platform supports both 2-wire and 3-wire control arrangements, depending on configuration.
The ATS490C25Y provides:
It uses a two-wire RS-485 interface for serial communication and a 100BASE-TX Ethernet interface for network communication.
Configure:
Enter the correct motor information.
Important parameters may include:
Do not copy parameters from another motor unless the motors and applications are genuinely equivalent.
Before issuing a start command:
Perform an initial controlled start.
Observe:
Stop immediately if abnormal behavior occurs.
After the initial test:
| Item | Verification |
|---|---|
| ATS490C25Y Model | Confirmed |
| 250 A Rating | Confirmed |
| Motor Voltage | Verified |
| Motor Current | Verified |
| Motor Frequency | Verified |
| Application Duty | Verified |
| Cabinet Dimensions | Verified |
| Mounting Orientation | Verified |
| Cooling Clearance | Verified |
| Power Wiring | Checked |
| Motor Wiring | Checked |
| Grounding | Checked |
| Control Wiring | Checked |
| Communication | Tested |
| Motor Parameters | Configured |
| Initial Energization | Completed |
| Rotation Direction | Verified |
| Acceleration | Tested |
| Full-Load Operation | Tested |
| Fault Handling | Tested |
Check the following in order:
If local control works but PLC control does not, focus on the control and communication system before replacing the starter.
Possible causes include:
Measure motor current during acceleration and compare the result with the expected operating behavior.
Potential causes:
Repeatedly resetting the starter without diagnosing the cause can increase equipment stress.
Check:
If the starter begins the sequence and then stops, identify the event immediately preceding the stop.
Possible causes include:
The ATS490 installation instructions emphasize vertical cabinet mounting and adequate cooling-air circulation.
Inspect:
A motor that operates correctly without load but overheats under load should be investigated for mechanical overload as well as electrical issues.
Investigate:
The objective is not to eliminate starting current completely but to control it appropriately while providing sufficient torque to accelerate the load.
If the motor starts but the machine experiences a sudden mechanical impact, investigate:
A suitable soft-start profile should match the actual mechanical characteristics of the machine.
Check:
If vibration occurs only during starting, compare the acceleration profile with the mechanical response.
The ATS490C25Y supports Modbus Serial, Modbus TCP, and EtherNet/IP.
If communication fails, check:
A communication failure does not automatically mean the power section of the starter is defective.
If local control operates correctly but PLC control does not:
Possible causes include:
Record the exact condition when the stop occurs.
Intermittent faults should be investigated by recording operating conditions.
Record:
Look for a pattern.
For example, if the fault only appears after multiple consecutive starts, thermal accumulation or excessive starting duty may be more likely than a permanent hardware fault.
Inspect periodically for:
Check:
Verify:
Because the ATS490C25Y is a high-current 250 A device, thermal management should be treated as an important maintenance item.
Maintain a backup of:
A configuration backup can substantially reduce downtime after replacement or maintenance.
The ATS490C25Y has a native Ethernet port supporting Modbus TCP and EtherNet/IP, together with a Modbus serial connection.
A typical automation architecture can be represented as:
HMI
↓
PLC
↓
Industrial Ethernet
↓
ATS490C25Y
↓
Three-Phase Motor
↓
Machine
The starter can therefore participate in centralized motor management.
Potential functions include:
The ATS490 platform provides a range of dedicated functions that can be useful for demanding industrial equipment.
These include:
These functions make the ATS490C25Y more than a simple motor-starting device and allow it to participate in broader equipment-management strategies.
| Component | Function |
|---|---|
| Three-Phase AC Supply | Motor Power |
| Circuit Breaker | Electrical Protection |
| Fuses | Short-Circuit Protection |
| ATS490C25Y | Motor Soft Starting |
| AC Motor | Mechanical Power |
| Motor Cable | Power Connection |
| PLC | Automation Control |
| HMI | Operator Interface |
| SCADA | Supervisory Monitoring |
| Ethernet Switch | Network Connectivity |
| RS-485 Network | Serial Communication |
| Sensors | Process Feedback |
| Safety Circuit | Machine Protection |
| Mechanical Load | Driven Equipment |
The following ATS490 models occupy nearby positions in the same product family. The actual replacement must always be selected based on motor current, duty, voltage, application, and installation requirements.
| Model | Relative Current Class | Typical Use |
|---|---|---|
| ATS490C17Y | Lower | Smaller industrial motor applications |
| ATS490C21Y | Lower than C25Y | Intermediate higher-current applications |
| ATS490C25Y | 250 A | Higher-current industrial applications |
| ATS490C32Y | Higher | Larger motor applications |
| ATS490C41Y | Higher Frame | Larger high-current applications |
The ATS490 catalog places the C21Y, C25Y, and C32Y references in the same physical frame size of 206 × 443 × 265 mm, while the C41Y and larger references use a larger frame.
Physical similarity does not mean electrical interchangeability. Motor current and application duty should always be checked before substitution.
The ATS490C25Y provides a 250 A normal-duty operational current rating, making it suitable for appropriately sized higher-current industrial motors.
The unit supports 208–690 V AC, allowing it to serve a broad range of industrial motor systems.
Torque control helps provide a controlled acceleration profile that can be adapted to the mechanical characteristics of the machine.
The internal bypass helps provide efficient normal motor operation after the starting process.
Modbus Serial, Modbus TCP, and EtherNet/IP allow the starter to be incorporated into PLC and industrial Ethernet architectures.
Functions such as anti-jam, pump starting, smoke extraction, braking, condition monitoring, and power monitoring can support different industrial applications.
The ATS490 family is intended for equipment including pumps, fans, compressors, conveyors, mixers, cutters, grinders, and crushers.
The Schneider ATS490C25Y is a 250 A Altivar ATS490 soft starter for three-phase asynchronous AC motors.
The ATS490C25Y has a 250 A normal-duty operational current rating.
The applicable motor supply range is 208–690 V AC.
The control supply range is 110–230 V AC.
The dimensions are:
443 × 206 × 265 mm
The catalog expresses these as 206 mm width × 443 mm height × 265 mm depth.
The listed product weight is:
19 kg.
Yes. The ATS490C25Y includes an integrated internal bypass.
The ATS490C25Y supports:
The ATS490 soft starter is designed for vertical installation inside an enclosure, approximately ±10°, to support the intended cooling arrangement.
Typical applications include pumps, fans, compressors, conveyors, mixers, cutters, grinders, and crushers, subject to correct motor and application sizing.
Possible causes include excessive load, insufficient starting torque, incorrect motor settings, motor faults, supply problems, phase loss, or inappropriate application configuration.
Possible causes include excessive starting frequency, high cabinet temperature, poor airflow, blocked cooling passages, excessive current, or incorrect sizing.
Check Ethernet or RS-485 wiring, addressing, PLC configuration, protocol settings, network hardware, and control logic before assuming a starter hardware failure.
For field troubleshooting, the following sequence can help isolate the problem efficiently:
1. Verify Incoming Power
↓
2. Verify Control Supply
↓
3. Check Starter Status and Faults
↓
4. Check Motor Wiring
↓
5. Check Motor Condition
↓
6. Check Mechanical Load
↓
7. Check Motor Parameters
↓
8. Check Starting and Stopping Settings
↓
9. Check PLC and Control Signals
↓
10. Check Communication
↓
11. Perform Controlled Test
↓
12. Record Final Operating Values
This approach separates power problems, motor problems, mechanical problems, configuration problems, and communication problems rather than treating every fault as a starter failure.
| Area | Recommendation |
|---|---|
| Product | Schneider ATS490C25Y |
| Rated Current | 250 A Normal Duty |
| Motor Voltage | 208–690 V AC |
| Control Supply | 110–230 V AC |
| Dimensions | 443 × 206 × 265 mm |
| Weight | 19 kg |
| Mounting | Vertical Inside Enclosure |
| Cooling | Maintain Required Airflow |
| Motor | Three-Phase Asynchronous |
| Communication | Modbus / Modbus TCP / EtherNet/IP |
| Main Maintenance | Cooling, Wiring, Motor, Parameters |
| Main Troubleshooting | Power → Starter → Motor → Load → Control |
The Schneider ATS490C25Y Soft Starter is a high-current member of the Altivar ATS490 family, providing a 250 A normal-duty rating for appropriately sized three-phase asynchronous motor applications. It supports a broad 208–690 V AC motor supply range and a 110–230 V AC control supply.
With physical dimensions of 443 × 206 × 265 mm and a weight of 19 kg, the ATS490C25Y requires proper cabinet support, vertical mounting, cooling airflow, electrical protection, and sufficient cable and maintenance clearance.
Its integrated bypass, torque-controlled starting, monitoring functions, and Modbus/EtherNet/IP communication make it suitable for integration into industrial automation systems. The ATS490 platform is designed for applications including pumps, fans, compressors, conveyors, mixers, cutters, grinders, and crushers.
For installation, the most important considerations are correct motor selection, electrical protection, wiring, grounding, cabinet thermal management, control configuration, and communication setup. For troubleshooting, a structured sequence covering power, starter status, motor, mechanical load, configuration, PLC control, and communication is recommended.
When correctly selected and commissioned, the ATS490C25Y provides controlled motor starting and stopping while supporting the monitoring and automation requirements of modern industrial process and infrastructure equipment.