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- ATS48C25Q
- Soft Starter
- France
- 380 x 320 x 265 mm
- 18.2 kg
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Product Overview
The Schneider ATS48C25Q Soft Starter is an industrial motor-control device in the Altistart 48 series. It is designed for controlled starting and stopping of three-phase asynchronous motors used in industrial machinery, production lines, process equipment, pumping systems, ventilation systems, and material-handling applications.
When a motor is connected directly to the electrical supply, its starting current can be substantially higher than its normal operating current. The sudden increase in torque can also place considerable stress on couplings, shafts, gearboxes, belts, pumps, and other mechanical components.
The ATS48C25Q provides controlled acceleration to make motor startup more gradual. Depending on the application, controlled stopping can also be used to reduce abrupt changes in the mechanical system.
The unit can also be incorporated into automation architectures involving PLCs, HMIs, DCS systems, and industrial communication networks.
For the product specified in this article, the physical dimensions are 380 × 320 × 265 mm, and the weight is 18.2 kg.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48C25Q |
| Product Type | Soft Starter |
| Motor Application | Three-Phase Asynchronous Motor |
| Main Function | Controlled Motor Starting and Stopping |
| Communication | Modbus |
| Communication Interface | RS-485 |
| Installation Orientation | Vertical |
| Dimensions | 380 × 320 × 265 mm |
| Weight | 18.2 kg |
| Cooling | Forced Air |
| Typical Applications | Pumps, Fans, Compressors, Conveyors, Mixers |
| Automation Integration | PLC / HMI / DCS |
Technical Specifications
| Technical Item | ATS48C25Q |
|---|---|
| Manufacturer | Schneider Electric |
| Series | Altistart 48 |
| Model | ATS48C25Q |
| Product Category | Industrial Soft Starter |
| Motor Type | Three-Phase Asynchronous Motor |
| Primary Function | Controlled Acceleration and Deceleration |
| Communication | Modbus |
| Communication Interface | RS-485 |
| Mounting | Vertical |
| Height | 380 mm |
| Width | 320 mm |
| Depth | 265 mm |
| Weight | 18.2 kg |
| Cooling Method | Forced Air |
| Typical Loads | Pumps, Fans, Compressors, Conveyors, Mixers |
| Industrial Integration | PLC / HMI / DCS |
The actual application should always be evaluated according to the motor’s electrical characteristics, load profile, starting duty, operating environment, and required starting performance.
ATS48C25Q Working Principle
The ATS48C25Q is installed between the electrical supply and the motor.
A simplified system architecture is:
Three-Phase AC Supply
↓
Circuit Protection / Disconnect
↓
ATS48C25Q Soft Starter
↓
Three-Phase Motor
↓
Mechanical Load
During startup, the soft starter manages the motor acceleration rather than applying an uncontrolled direct connection.
The basic sequence is:
Start Command
↓
Controlled Acceleration
↓
Motor Running
↓
Stop Command
↓
Controlled Stopping
The exact configuration should be established according to the motor, machine, and process requirements.
Why Use a Soft Starter?
A soft starter is useful when direct-on-line starting creates undesirable electrical or mechanical effects.
Potential benefits include:
- Smoother motor acceleration
- Reduced mechanical shock
- Reduced stress on drive components
- More controlled motor startup
- Reduced process disturbance
- Controlled stopping
- Motor monitoring
- Integration with industrial automation
For machines with large rotating masses, long conveyors, pumps, fans, and compressors, controlled starting can be particularly valuable.
Main Functions
Controlled Acceleration
The ATS48C25Q provides a controlled starting sequence for the motor.
A properly configured acceleration profile can reduce sudden torque transmission through:
- Couplings
- Shafts
- Gearboxes
- Belts
- Chains
- Pump assemblies
- Conveyor drives
Controlled Deceleration
For applications where an immediate motor stop is undesirable, controlled stopping can provide a more gradual transition.
Potential applications include:
- Pumps
- Conveyors
- Fans
- High-inertia machinery
- Process equipment
The correct stopping method depends on the mechanical and process requirements.
Motor Protection and Monitoring
The ATS48 platform provides protection and monitoring functions for detecting abnormal operating conditions.
Possible conditions include:
- Excessive current
- Motor thermal stress
- Starter temperature
- Phase-related abnormalities
- Abnormal starting behavior
Protection parameters should be configured using actual motor data and application requirements.
Industrial Applications
1. Industrial Pump Systems
The ATS48C25Q can be considered for motor-driven pump applications where smooth starting and stopping are desirable.
Examples include:
- Process pumps
- Cooling-water systems
- Water circulation
- Transfer pumps
- Water treatment equipment
- Industrial fluid handling
A controlled starting sequence can reduce sudden changes within the mechanical and fluid systems.
2. Fans and Blowers
Fans and blowers can have substantial rotating inertia, especially in larger industrial installations.
Potential applications include:
- Factory ventilation
- Exhaust systems
- Cooling systems
- Dust extraction
- Air-handling equipment
- Process ventilation
3. Compressors
Compressor motors can require considerable starting torque.
Before installation, engineers should evaluate:
- Motor rated current
- Compressor load
- Starting duration
- Starting frequency
- Operating cycle
- Ambient conditions
- Mechanical resistance
4. Conveyors
Conveyor systems can experience considerable mechanical stress when motors are started abruptly.
Controlled acceleration can help reduce stress on:
- Belts
- Gearboxes
- Couplings
- Shafts
- Drive systems
It can also provide smoother movement of conveyed materials.
5. Mixers
Mixers may have high starting resistance, especially when processing dense or viscous materials.
The ATS48C25Q can provide controlled acceleration when properly matched to the motor and application.
6. Industrial Machinery
Other possible applications include:
- Blowers
- Material-handling equipment
- Rotating machinery
- Production equipment
- Process machinery
- Mechanical drive systems
Installation Guide
Step 1 – Verify Product Identification
Confirm the equipment identification:
Schneider ATS48C25Q
Inspect the device before installation.
Check for:
- Cracked housing
- Damaged terminals
- Bent mounting points
- Loose parts
- Moisture
- Excessive dust
- Discoloration
- Signs of overheating
Do not install visibly damaged equipment until it has been inspected.
Step 2 – Verify Motor Nameplate Information
Collect the actual motor information before configuring the soft starter.
Record:
- Rated voltage
- Rated current
- Rated frequency
- Rated power
- Motor connection
- Rated speed
- Duty
- Starting characteristics
Correct motor information is essential for appropriate configuration.
Step 3 – Cabinet Design
The specified ATS48C25Q dimensions are:
380 × 320 × 265 mm
Do not design the enclosure around the exact dimensions alone.
Additional space is required for:
- Power cables
- Control cables
- Communication wiring
- Protective equipment
- Cable bending
- Ventilation
- Inspection
- Maintenance
Avoid installing the soft starter immediately next to other major heat-producing equipment.
Step 4 – Mounting
The specified weight is 18.2 kg.
The control cabinet and mounting hardware must therefore be capable of supporting the device securely.
Verify:
- Panel rigidity
- Mounting hardware
- Vertical orientation
- Vibration resistance
- Cable support
- Maintenance access
Step 5 – Environmental Preparation
The cabinet should protect the ATS48C25Q from unsuitable industrial conditions.
Avoid direct exposure to:
- Water
- Condensation
- Conductive dust
- Excessive dust
- Oil mist
- Corrosive substances
- Excessive vibration
- Excessive heat
Adequate airflow and cabinet cooling are important for reliable operation.
Step 6 – Electrical Safety
Before beginning wiring:
- Disconnect all relevant power sources.
- Apply lockout/tagout procedures.
- Verify that hazardous voltage is absent.
- Isolate the motor.
- Check for stored energy.
- Confirm the work area is safe.
- Use appropriate electrical PPE.
Never work on energized power terminals.
Step 7 – Connect the Power Circuit
Connect the incoming three-phase supply and motor circuit according to the approved electrical design.
Inspect:
- Phase connections
- Cable sizing
- Circuit protection
- Grounding
- Terminal connections
- Insulation
- Cable routing
Perform a complete wiring inspection before energization.
Step 8 – Connect Control Wiring
The control system may include:
- Start command
- Stop command
- Reset
- Run indication
- Fault indication
- External interlocks
- PLC commands
- Emergency-stop logic
Control wiring should be routed and organized appropriately relative to power wiring.
Step 9 – Connect Communication
The ATS48C25Q can be incorporated into an industrial automation architecture through its communication capability.
A typical arrangement is:
PLC
↓
RS-485 / Modbus
↓
ATS48C25Q
↓
Motor
Verify:
- Network wiring
- Device address
- Communication settings
- PLC configuration
- Network topology
- Control permissions
Step 10 – Configure Motor Parameters
Enter the actual motor data into the starter.
Important configuration areas may include:
- Motor rated current
- Acceleration time
- Deceleration time
- Current limitation
- Protection settings
- Stop mode
- Command source
Do not duplicate settings from another machine without checking the motor and load.
Step 11 – Inspect the Mechanical Load
Before the first motor start, inspect the complete machine.
Check:
- Shaft
- Coupling
- Bearings
- Gearbox
- Belts
- Pump
- Fan
- Conveyor
- Guards
Verify that the load can move normally without unexpected resistance.
Commissioning Procedure
Pre-Commissioning Inspection
Before applying power:
- Verify the ATS48C25Q model.
- Confirm motor nameplate information.
- Inspect power wiring.
- Inspect control wiring.
- Verify grounding.
- Check protective devices.
- Confirm cabinet ventilation.
- Verify soft-starter parameters.
- Test control interlocks.
- Test emergency-stop functions.
Initial Energization
After completing the inspection:
- Energize the system.
- Observe the ATS48C25Q status.
- Check for fault indications.
- Verify control inputs.
- Check communication status.
- Confirm the selected operating mode.
If possible, perform the first test under controlled mechanical conditions.
First Motor Start
Start the motor while observing:
- Starting current
- Acceleration time
- Motor sound
- Vibration
- Starter status
- Rotation
- Mechanical movement
- Process response
Stop the test immediately if abnormal electrical or mechanical behavior occurs.
Troubleshooting Guide
Fault 1 – ATS48C25Q Does Not Power Up
Possible Causes
- Incoming supply missing
- Circuit protection open
- Incorrect wiring
- Control circuit problem
- Internal fault
Diagnostic Steps
Check:
- Incoming voltage
- Protective devices
- Power wiring
- Control circuit
- Starter status
Fault 2 – Motor Does Not Start
Possible Causes
- Start command missing
- Incorrect control wiring
- Active interlock
- Incorrect command source
- Incorrect configuration
- Motor problem
- Mechanical obstruction
Troubleshooting
Trace the start command from the PLC or control device to the ATS48C25Q.
Then inspect the motor circuit and mechanical load.
Fault 3 – Motor Accelerates Too Slowly
Possible Causes
- Acceleration time too long
- Current limitation too restrictive
- Incorrect motor parameters
- Excessive load
- Mechanical resistance
Corrective Action
Verify the motor data and acceleration parameters.
Then inspect the connected machine for abnormal resistance.
Fault 4 – Excessive Starting Current
Possible Causes
- Acceleration time too short
- Current limitation incorrectly configured
- Heavy mechanical load
- Incorrect motor parameters
- Motor condition
Compare the configured parameters against the actual motor nameplate.
Fault 5 – Starter Trips During Acceleration
Possible Causes
- Motor overload
- Phase problem
- Incorrect wiring
- Incorrect configuration
- Excessive mechanical load
- Mechanical obstruction
Do not repeatedly reset the device without determining the cause.
Fault 6 – ATS48C25Q Overheats
Possible Causes
- Insufficient ventilation
- Blocked cooling path
- High ambient temperature
- Excessive starting frequency
- Motor overload
- Dust accumulation
- Cooling-system problem
Corrective Action
Inspect the cabinet’s complete thermal environment.
Verify that cooling airflow is not obstructed and that nearby components are not producing excessive heat.
Fault 7 – Motor Vibrates
Possible Causes
- Shaft misalignment
- Coupling wear
- Bearing deterioration
- Mechanical imbalance
- Incorrect acceleration profile
- Mechanical resonance
Investigate both the electrical control system and the mechanical equipment.
Fault 8 – Motor Stops Abruptly
Possible Causes
- Incorrect stop configuration
- External stop command
- Incorrect deceleration settings
- PLC logic problem
- High-inertia load
Review the complete stop sequence.
Fault 9 – Motor Does Not Stop
Possible Causes
- Stop command missing
- Control wiring problem
- PLC logic issue
- External interlock
- Incorrect configuration
Trace the stop signal through the complete control system.
Fault 10 – Communication Failure
Possible Causes
- Incorrect device address
- Incorrect communication settings
- RS-485 wiring problem
- PLC configuration error
- Network topology problem
- Communication interface issue
Diagnostic Sequence
Inspect the physical communication network first.
Then verify:
- Device address
- Communication speed
- Serial parameters
- PLC configuration
- Network connections
Fault 11 – Repeated Overload Faults
Possible Causes
- Excessive mechanical load
- Bearing problems
- Mechanical obstruction
- Incorrect motor parameters
- Excessive starting frequency
- Incorrect protection settings
- Process overload
Repeated overload faults should be investigated as a complete motor-control and mechanical system.
Fault Diagnosis Flow
A systematic diagnostic process can follow this sequence:
Incoming Supply
↓
Circuit Protection
↓
ATS48C25Q Status
↓
Start / Stop Commands
↓
Communication
↓
Power Circuit
↓
Motor
↓
Mechanical Load
↓
Configuration
↓
Restart Test
This process helps isolate whether the problem originates in the supply, protection, control circuit, communication network, soft starter, motor, parameters, or mechanical system.
Preventive Maintenance
Electrical Inspection
Periodically inspect:
- Power terminals
- Control terminals
- Ground connections
- Cable insulation
- Signs of overheating
- Loose connections
Cooling System Inspection
Check:
- Airflow
- Cooling paths
- Cabinet ventilation
- Filters
- Dust accumulation
- Ambient temperature
Mechanical Inspection
Inspect:
- Mounting hardware
- Cable supports
- Motor alignment
- Couplings
- Bearings
- Gearboxes
- Vibration
Operating Condition Monitoring
Monitor:
- Motor current
- Starting duration
- Operating temperature
- Fault history
- Starting frequency
- Motor vibration
- Abnormal noise
Comparing current operating conditions with historical values can help identify developing equipment problems.
Preventive Maintenance Table
| Maintenance Area | Recommended Action |
|---|---|
| Power Terminals | Check tightness and heating |
| Control Terminals | Inspect connection integrity |
| Grounding | Verify continuity |
| RS-485 Network | Inspect communication wiring |
| Cooling Paths | Clean and inspect |
| Cabinet Ventilation | Keep airflow unobstructed |
| Filters | Clean or replace as necessary |
| Motor Current | Monitor operating values |
| Fault History | Review periodically |
| Mounting Hardware | Check mechanical stability |
| Cables | Inspect insulation and routing |
| Cabinet Interior | Remove dust and contamination |
| Motor / Load | Inspect alignment and vibration |
Common Installation Mistakes
Incorrect Motor Parameters
Incorrect motor data can result in poor acceleration and unnecessary protection trips.
Insufficient Cabinet Clearance
The 380 × 320 × 265 mm dimensions describe the equipment size, but additional space must be provided for ventilation, wiring, and maintenance.
Inadequate Mounting
At 18.2 kg, the ATS48C25Q requires a stable mounting structure capable of supporting the device securely.
Poor Ventilation
Restricted airflow can increase thermal stress and may cause overheating.
Loose Electrical Connections
Loose connections can cause heating, voltage drop, intermittent faults, and equipment damage.
Incorrect Control Wiring
A missing start command or active interlock can prevent motor operation.
Incorrect Communication Settings
Wrong addressing or serial settings can prevent communication with the PLC.
Ignoring Mechanical Problems
A blocked pump, overloaded conveyor, worn bearing, or damaged coupling can create symptoms that resemble an electrical fault.
Excessive Fault Resetting
Repeatedly resetting the starter without correcting the root cause can increase downtime and equipment stress.
PLC and Automation Integration
The ATS48C25Q can be incorporated into a broader industrial automation architecture.
A representative system is:
PLC / DCS
↓
Control Commands
↓
ATS48C25Q
↓
Three-Phase Motor
↓
Machine
↓
Industrial Process
The communication interface can allow the soft starter to exchange available control, status, and diagnostic information with the automation system.
Possible functions include:
- Remote start
- Remote stop
- Fault monitoring
- Motor status monitoring
- Alarm management
- Process interlocking
- Diagnostic monitoring
Supporting Components
A complete ATS48C25Q installation may include:
- Circuit breakers
- Disconnect switches
- Fuses
- Contactors
- Motor protection devices
- PLC controllers
- HMIs
- Control relays
- RS-485 communication equipment
- Emergency-stop circuits
- Motor sensors
- Process sensors
The complete installation should be engineered according to the motor, supply, load, protection requirements, and application duty.
Related Altistart 48 Models
| Model | Typical Application Position |
|---|---|
| ATS48C11Q | Industrial motor-control applications |
| ATS48C14Q | Larger industrial motor applications |
| ATS48C17Q | Higher-power industrial applications |
| ATS48C21Q | Higher-current motor-control applications |
| ATS48C25Q | Larger industrial motor-control applications |
| ATS48C32Q | High-power motor-control applications |
Selection should be based on actual motor current, voltage, starting duty, mechanical load, environmental conditions, and required operating performance.
Key Advantages
- Altistart 48 industrial soft-starter platform
- Controlled motor acceleration
- Controlled motor stopping
- Three-phase asynchronous motor applications
- Motor monitoring
- Motor protection functions
- Starter protection
- Modbus communication capability
- RS-485 communication
- PLC integration
- HMI integration
- DCS integration
- Suitable for pumps
- Suitable for fans
- Suitable for blowers
- Suitable for compressors
- Suitable for conveyors
- Suitable for mixers
- Forced-air cooling
- Vertical mounting
- Dimensions: 380 × 320 × 265 mm
- Weight: 18.2 kg
Technical FAQs
What is the Schneider ATS48C25Q?
The Schneider ATS48C25Q is an Altistart 48 industrial soft starter designed for controlled starting and stopping of three-phase asynchronous motors.
What are the dimensions of the ATS48C25Q?
The specified dimensions are 380 × 320 × 265 mm.
What is the weight of the ATS48C25Q?
The specified weight is 18.2 kg.
What does the ATS48C25Q do?
It provides controlled motor acceleration and stopping while providing monitoring and protection functions for industrial motor-control applications.
Where can the ATS48C25Q be used?
Potential applications include pumps, fans, compressors, conveyors, blowers, mixers, and other industrial machinery driven by three-phase motors.
Can the ATS48C25Q communicate with a PLC?
Yes. The ATS48 platform supports Modbus communication through an RS-485-based network, allowing suitable PLC and automation architectures to exchange available control and diagnostic information.
Why does the motor fail to start?
Possible causes include a missing start command, incorrect control wiring, active interlocks, incorrect parameters, motor faults, or mechanical obstruction.
Why does the ATS48C25Q overheat?
Possible causes include insufficient cabinet ventilation, restricted airflow, high ambient temperature, excessive starting frequency, motor overload, or contamination.
Why does the starter trip during acceleration?
Possible causes include excessive mechanical load, incorrect motor data, phase-related problems, unsuitable starting parameters, wiring problems, or mechanical resistance.
What should be checked before commissioning?
Verify the motor nameplate, power circuit, protective devices, grounding, control wiring, communication configuration, soft-starter parameters, cabinet ventilation, and mechanical load.
How should repeated faults be diagnosed?
Begin with the incoming supply and protection system. Then check the ATS48C25Q status, control signals, communication network, motor circuit, motor condition, parameters, and mechanical load. This systematic approach can prevent unnecessary replacement of a functioning starter.
Conclusion
The Schneider ATS48C25Q Soft Starter is an industrial motor-control solution for controlled starting and stopping of three-phase asynchronous motors. It can be used in applications where direct-on-line starting may cause excessive electrical demand, mechanical shock, or process disturbance.
The specified ATS48C25Q measures 380 × 320 × 265 mm and weighs 18.2 kg. These physical characteristics should be considered during cabinet design, mounting, cable routing, ventilation planning, and maintenance access.
Successful commissioning depends on correctly matching the soft starter to the motor and load, entering accurate motor parameters, verifying the electrical installation, ensuring adequate cooling, and testing the control system before full operation.
When troubleshooting, technicians should diagnose the complete system rather than immediately assuming that the soft starter has failed. A structured inspection of the power supply, protection circuit, control signals, communication, motor, configuration, and mechanical load provides a more reliable path to identifying the root cause.
With proper installation, commissioning, preventive maintenance, and systematic troubleshooting, the ATS48C25Q can serve as a reliable component within industrial motor-control and automation systems.