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- ATS48C48Q
- Soft Starter
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- 670 x 400 x 300 mm
- 51.4 kg
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Product Overview
The Schneider Electric ATS48C48Q Altistart 48 Soft Starter is an industrial electronic motor starter designed to provide controlled starting and stopping for three-phase asynchronous motors. It is part of the Altistart 48 family, a soft-start platform intended for applications where direct-on-line starting can produce excessive inrush current, mechanical shock, pressure surges, or undesirable process disturbances.
The primary purpose of the ATS48C48Q is to control the motor during acceleration and deceleration while allowing the motor to operate normally once it has reached its operating condition. Unlike a variable frequency drive, the soft starter is not primarily intended for continuous variable-speed operation. Instead, it focuses on improving the starting and stopping behavior of fixed-speed AC motor systems.
The supplied physical dimensions for the ATS48C48Q are 670 × 400 × 300 mm, and the supplied weight is 51.4 kg. This relatively large and heavy industrial unit requires appropriate cabinet space, mechanical support, ventilation, power distribution, and maintenance access.
The ATS48C48Q can be considered for applications such as:
- Pumps
- Fans
- Blowers
- Conveyors
- Compressors
- Mixers
- Material-handling machinery
- Industrial process equipment
- Large rotating machinery
The correct application must always be determined from the motor’s electrical characteristics, load profile, starting frequency, acceleration requirements, environmental conditions, and system architecture.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48C48Q |
| Product Type | Soft Starter |
| Starter Type | Electronic Motor Soft Starter |
| Motor Type | Three-Phase Asynchronous Motor |
| Main Function | Controlled Motor Starting and Stopping |
| Application | Industrial Motor Control |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Installation | Industrial Electrical Cabinet |
| Typical Applications | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Cooling | Cabinet Ventilation Required |
| Control Integration | PLC / HMI / Hardwired Control |
Technical Specifications
| Technical Item | Specification |
|---|---|
| Brand | Schneider Electric |
| Series | Altistart 48 |
| Catalog Number | ATS48C48Q |
| Product Category | Soft Starter |
| Motor Application | Three-Phase AC Motor |
| Starting Function | Electronic Soft Start |
| Stopping Function | Controlled Soft Stop |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Mounting | Industrial Cabinet |
| Main Purpose | Reduced Motor Starting Stress |
| Control Application | Industrial Automation |
| Typical Load Types | Pump, Fan, Conveyor, Compressor, Mixer |
| Cooling Requirement | Adequate Airflow and Thermal Management |
| Maintenance | Periodic Electrical, Thermal, and Mechanical Inspection |
What Is the Schneider ATS48C48Q?
The ATS48C48Q is an electronic soft starter positioned between the industrial power supply and an AC motor.
A simplified system is:
Three-Phase AC Supply
↓
Circuit Protection / Disconnect
↓
ATS48C48Q Soft Starter
↓
Three-Phase AC Motor
↓
Mechanical Load
During startup, the soft starter progressively controls the motor’s electrical supply. Instead of immediately applying the full starting condition to the motor, it creates a controlled acceleration process.
This can reduce the stress experienced by:
- Motor windings
- Couplings
- Gearboxes
- Belts
- Shafts
- Bearings
- Conveyor structures
- Pumping systems
- Mechanical transmission components
Soft Starter Operating Principle
A three-phase induction motor can draw a substantially higher current during direct-on-line starting than during normal running.
The ATS48C48Q uses power electronics to manage the motor’s starting voltage.
A simplified sequence is:
Start Command
↓
Initial Controlled Voltage
↓
Voltage Progressively Increased
↓
Motor Accelerates
↓
Normal Operating Condition
During stopping, the process can be reversed:
Stop Command
↓
Controlled Reduction
↓
Motor Deceleration
↓
Motor Stops
The exact starting and stopping behavior depends on the application and configuration.
Why Use a Soft Starter?
Direct-on-line starting can produce several undesirable effects.
Electrical Effects
A large motor starting directly from the supply can create:
- High starting current
- Temporary voltage drop
- Electrical disturbances
- Increased stress on electrical distribution equipment
Mechanical Effects
Sudden motor acceleration can cause:
- Torque shock
- Coupling stress
- Belt tension
- Gearbox shock
- Shaft stress
- Product movement
Process Effects
Certain processes may also experience:
- Pump pressure surges
- Conveyor instability
- Fan vibration
- Compressor starting disturbances
The ATS48C48Q can help control these conditions by providing a more gradual motor startup.
Soft Starter vs. Variable Frequency Drive
It is important to distinguish the ATS48C48Q from a variable frequency drive.
| Function | ATS48C48Q Soft Starter | Variable Frequency Drive |
|---|---|---|
| Controlled Starting | Yes | Yes |
| Controlled Stopping | Yes | Yes |
| Continuous Speed Adjustment | No | Yes |
| Variable-Frequency Output | No | Yes |
| Starting Current Reduction | Yes | Yes |
| Fixed-Speed Operation | Well Suited | Also Possible |
| Variable-Speed Process | Limited | Excellent |
| Main Purpose | Starting/Stopping | Speed/Torque Control |
If the motor normally runs at one fixed speed and the primary requirement is a smoother startup, a soft starter may be more appropriate than a full variable frequency drive.
Industrial Applications
1. Pump Systems
Pumping equipment is one of the most common applications for soft starters.
A sudden pump start can create a rapid pressure change in the piping system. A controlled start can reduce the mechanical and hydraulic shock associated with abrupt acceleration.
Applications may include:
- Water treatment
- Industrial water circulation
- Cooling-water systems
- Process pumping
- Irrigation
- Fluid transfer
- Industrial utility systems
Controlled stopping can also be useful where abrupt motor shutdown causes pressure fluctuations.
2. Conveyor Systems
Conveyors often contain considerable mechanical inertia.
Starting the motor abruptly can cause:
- Belt shock
- Product movement
- Coupling stress
- Gearbox loading
- Mechanical vibration
The ATS48C48Q can provide controlled acceleration so that the conveyor reaches operating speed progressively.
This is particularly useful in:
- Manufacturing
- Warehousing
- Bulk handling
- Packaging
- Mining
- Material processing
3. Fans and Blowers
Large fans can have significant rotating inertia.
A soft starter can allow the motor to accelerate progressively rather than immediately applying the full mechanical starting demand.
Potential applications include:
- Industrial ventilation
- Exhaust systems
- Dust collection
- Cooling systems
- Air-handling equipment
- Industrial furnaces
4. Compressors
Compressors can impose substantial starting requirements on motors.
The ATS48C48Q can be incorporated into an appropriately sized compressor motor-control system where controlled starting is required.
Before installation, engineers should evaluate:
- Motor current
- Compressor load
- Starting conditions
- Starting frequency
- Mechanical characteristics
- Bypass arrangement
- Thermal requirements
5. Mixers and Agitators
Mixers may have high starting torque requirements, particularly when the material being processed is dense or viscous.
A controlled starting sequence can help reduce mechanical stress on:
- Motor shafts
- Gearboxes
- Couplings
- Agitator assemblies
6. Material-Handling Equipment
Material-handling machines frequently benefit from controlled acceleration.
Applications may include:
- Conveyors
- Transfer systems
- Industrial handling equipment
- Processing lines
- Bulk-material machinery
The soft starter should be selected according to the actual motor current and mechanical duty rather than simply the machine’s nominal horsepower.
Installation Guide
1. Verify the Catalog Number
Before installation, confirm the exact model:
Schneider Electric ATS48C48Q
The complete catalog number should be checked against the equipment documentation and nameplate.
Do not substitute another Altistart model simply because it has a similar physical appearance.
Important selection criteria include:
- Motor voltage
- Motor current
- Motor power
- Starting duty
- Number of starts per hour
- Starting time
- Load type
- Environmental conditions
2. Inspect the Unit
Before mounting the ATS48C48Q, inspect it for:
- Physical damage
- Damaged terminals
- Cracks
- Corrosion
- Moisture
- Contamination
- Loose hardware
- Signs of overheating
If the equipment has been stored for a long period, its condition should be assessed before energization.
3. Plan the Cabinet
The supplied dimensions are:
670 × 400 × 300 mm
The cabinet must provide more than the basic physical envelope of the starter.
Allow additional room for:
- Power cables
- Motor cables
- Control wiring
- Ventilation
- Maintenance
- Terminal access
- Inspection
- Equipment removal
Do not place the starter in a tightly enclosed space where heat cannot escape.
4. Consider the 51.4 kg Weight
The supplied weight is:
51.4 kg
The cabinet mounting structure must be capable of supporting this load.
During installation:
- Use appropriate lifting assistance.
- Support the starter securely.
- Use suitable mounting hardware.
- Do not lift the unit by electrical terminals.
- Do not use control wiring as lifting points.
- Verify mechanical stability after installation.
5. Provide Adequate Ventilation
Soft starters dissipate heat while carrying motor current.
Cabinet thermal design should consider:
- Ambient temperature
- Starter heat dissipation
- Motor load
- Starting frequency
- Other cabinet equipment
- Airflow
- Fan capacity
- Filter condition
If several power devices are installed in the same enclosure, their combined heat generation must be considered.
6. Check the Environment
Before installation, evaluate:
- Temperature
- Humidity
- Dust
- Oil
- Chemical contamination
- Condensation
- Vibration
- Altitude
- Airflow
A contaminated industrial environment can reduce the service life of power electronic equipment.
7. Grounding
Establish the protective grounding system before applying power.
Verify:
- Soft-starter grounding
- Cabinet grounding
- Motor grounding
- Ground conductor continuity
- Electrical bonding
Proper grounding is important for personnel safety and stable operation.
8. Incoming Power Wiring
Connect the incoming three-phase power according to the approved electrical design.
Before energization, verify:
- Supply voltage
- Phase configuration
- Protective device
- Disconnect
- Cable size
- Terminal identification
- Terminal tightness
- Grounding
Never assume the supply voltage simply from the physical appearance of the starter.
9. Motor Wiring
Connect the motor according to its actual electrical configuration.
Check:
- Motor voltage
- Motor current
- Phase connections
- Motor grounding
- Cable size
- Insulation
- Terminal condition
Incorrect motor connections can produce excessive current and poor starting behavior.
10. Motor Nameplate Information
Record the actual motor information before configuring the starter.
Important data includes:
- Rated voltage
- Rated current
- Frequency
- Power
- Speed
- Connection
- Duty
- Application
Motor current is especially important for proper soft-starter selection and configuration.
11. Control Wiring
The control circuit may contain:
- Start command
- Stop command
- Fault reset
- Run indication
- Fault indication
- Interlocks
- PLC signals
- Emergency-stop interface
Follow the machine’s electrical drawings when connecting these signals.
12. PLC Integration
The ATS48C48Q can be integrated into a larger automation system.
A typical control arrangement is:
PLC
↓
Start / Stop Command
↓
ATS48C48Q
↓
Motor
↓
Machine
The PLC may monitor:
- Motor running
- Starter status
- Fault condition
- Interlocks
- Process sequence
The soft starter handles the electrical motor-starting process while the PLC manages the overall machine sequence.
13. Cable Routing
High-current motor wiring can generate electromagnetic interference.
Where practical:
- Separate power wiring from control wiring.
- Separate motor cables from communication cables.
- Avoid long parallel runs between high-power and low-level signal cables.
- Use appropriate grounding and shielding.
- Maintain orderly cabinet wiring.
Good cable routing can reduce control and communication problems.
Commissioning Procedure
Step 1 — Mechanical Inspection
Verify:
- Mounting
- Cabinet structure
- Clearance
- Ventilation
- Cable routing
- Grounding
Step 2 — Electrical Inspection
Check:
- Incoming supply
- Motor wiring
- Grounding
- Protection
- Control wiring
- PLC interface
Step 3 — Configure the Motor
Enter the correct motor data based on the actual nameplate.
Do not copy settings from another machine without confirming that the motor and load are equivalent.
4. Configure Starting Characteristics
Starting settings should be determined according to the mechanical load.
Consider:
- Motor current
- Load inertia
- Required acceleration time
- Starting torque
- Number of starts
- Process requirements
A pump may require a different starting profile from a loaded conveyor or mixer.
5. Initial Motor Test
Perform a controlled initial test.
Observe:
- Motor current
- Acceleration
- Vibration
- Noise
- Starter status
- Motor temperature
If the motor fails to accelerate, stop the test and investigate rather than repeatedly increasing the starting parameters.
6. Verify Motor Rotation
Confirm that the motor rotates in the correct direction.
Incorrect rotation can cause problems in:
- Pumps
- Fans
- Compressors
- Conveyors
- Mixers
7. Test Stopping
Test the stopping behavior.
For pumps, inspect hydraulic response.
For conveyors, observe:
- Belt behavior
- Product movement
- Gearbox response
- Mechanical vibration
8. Loaded Commissioning
After successful initial testing, gradually introduce the normal mechanical load.
Monitor:
- Motor current
- Starter temperature
- Motor temperature
- Acceleration
- Stopping
- Mechanical vibration
- Process behavior
Troubleshooting Guide
ATS48C48Q Does Not Start
Check:
- Incoming power
- Start command
- Control wiring
- Stop circuit
- Interlocks
- Active fault
- Motor wiring
- Configuration
A missing start signal can make a correctly functioning soft starter appear defective.
No Power to the Starter
Possible causes include:
- Open disconnect
- Tripped circuit breaker
- Protective-device operation
- Missing phase
- Incorrect power wiring
- Loose connection
- Upstream electrical problem
Check the complete power path.
Motor Does Not Accelerate
Possible causes:
- Insufficient starting torque
- Excessive mechanical load
- Incorrect motor connection
- Incorrect starter configuration
- Motor fault
- Mechanical obstruction
Check both the electrical and mechanical systems.
Motor Starts Slowly
If the motor takes too long to reach operating speed, investigate:
- Starting parameters
- Motor load
- Motor current
- Mechanical resistance
- Motor condition
- Starter selection
A slow start is not necessarily caused by the soft starter itself.
Excessive Starting Current
Possible causes include:
- Excessive mechanical load
- Starting configuration
- Incorrect motor parameters
- Motor problem
- Incorrect starter sizing
- Insufficient supply capacity
Compare measured current with the motor nameplate information.
Motor Starts Abruptly
If the motor does not appear to accelerate progressively, inspect:
- Starting configuration
- Control mode
- Bypass arrangement
- Control wiring
- Start command
- Starter operating condition
The complete starting sequence should be verified.
Motor Stops Too Quickly
If the motor stops abruptly:
- Check the stop configuration.
- Verify the control signal.
- Inspect the machine sequence.
- Check whether a bypass or contactor is changing the motor circuit.
- Evaluate the mechanical load.
Motor Overheating
Possible causes include:
- Excessive load
- Long acceleration time
- Too many starts
- Low-speed operation
- Motor cooling problem
- Mechanical friction
- Incorrect motor current configuration
Frequent starting can produce significant motor heating even if the motor operates normally after reaching speed.
Soft Starter Overheating
Possible causes:
- High motor current
- Excessive starting frequency
- High ambient temperature
- Insufficient cabinet ventilation
- Blocked airflow
- Dust accumulation
- Incorrect starter selection
Inspect both the electrical load and cabinet thermal conditions.
Missing Phase
A phase-loss condition can produce:
- Motor overheating
- High current
- Poor acceleration
- Abnormal operation
- Protective trips
Inspect:
- Incoming supply
- Circuit protection
- Power terminals
- Motor cable
- Motor terminals
Pump Pressure Surge
If a pump system experiences excessive pressure fluctuation, investigate:
- Starting profile
- Stopping profile
- Valve operation
- Pipe condition
- Pump characteristics
- Hydraulic system design
The soft starter should be configured as part of the complete pump system.
Conveyor Mechanical Shock
If the conveyor still experiences shock despite soft starting, inspect:
- Acceleration profile
- Belt tension
- Coupling
- Gearbox
- Motor
- Mechanical alignment
- Load distribution
A soft starter cannot correct mechanical defects.
PLC Cannot Start the ATS48C48Q
Check:
- PLC output
- Control voltage
- Start input
- Stop input
- Interlocks
- Fault status
- Wiring
- PLC logic
Trace the signal from the PLC output to the starter control input.
Fault Appears Randomly
For intermittent problems, record:
- Fault time
- Motor current
- Number of starts
- Ambient temperature
- Motor temperature
- Process load
- Supply voltage
A pattern can indicate whether the fault is caused by thermal, electrical, mechanical, or process conditions.
Preventive Maintenance
Electrical Inspection
Periodically inspect:
- Input terminals
- Motor terminals
- Ground connections
- Control wiring
- Protective devices
Look for:
- Loose connections
- Heat discoloration
- Burn marks
- Corrosion
- Damaged insulation
Thermal Inspection
Check:
- Cabinet temperature
- Airflow
- Fans
- Filters
- Ventilation openings
- Dust accumulation
Thermal issues can cause intermittent problems before developing into permanent failures.
Motor Inspection
Regularly inspect:
- Motor bearings
- Couplings
- Shaft
- Cooling system
- Vibration
- Insulation
- Operating current
A degraded motor can increase the load seen by the soft starter.
Mechanical Load Inspection
Check the driven equipment for:
- Excessive friction
- Bearing problems
- Gearbox wear
- Belt problems
- Coupling damage
- Pump blockage
- Fan obstruction
- Conveyor misalignment
Mechanical maintenance is an important part of soft-starter maintenance.
Configuration Backup
After successful commissioning, record the final configuration.
Recommended records include:
- ATS48C48Q model
- Motor nameplate data
- Starting settings
- Stopping settings
- Control configuration
- PLC interface
- Application type
- Commissioning date
A documented configuration can significantly reduce troubleshooting time.
Replacement Selection
When replacing the ATS48C48Q, compare the complete application requirements.
| Selection Factor | Verification |
|---|---|
| Motor Voltage | Required |
| Motor Current | Required |
| Motor Power | Required |
| Starting Duty | Required |
| Number of Starts | Required |
| Acceleration Time | Required |
| Load Inertia | Required |
| Control Voltage | Required |
| I/O | Required |
| Communication | Required |
| Cabinet Dimensions | Required |
| Cooling | Required |
| Environmental Conditions | Required |
| Mounting | Required |
A soft starter with a similar appearance or physical size is not automatically a suitable replacement.
Compatible System Components
| Component | Typical Function |
|---|---|
| Schneider PLC | Machine control |
| HMI | Operator interface |
| Circuit Breaker | Electrical protection |
| Disconnect Switch | Isolation |
| Motor Contactor | Switching / Bypass |
| Three-Phase Motor | Mechanical power |
| Sensors | Process feedback |
| Control Relay | Interlocking |
| Industrial Cabinet | Equipment enclosure |
| Cooling Fan | Heat removal |
| Motor Protection | Motor protection |
The exact combination depends on the machine’s electrical architecture.
Key Advantages
Controlled Motor Starting
The ATS48C48Q can progressively accelerate an induction motor instead of applying the full starting condition abruptly.
Reduced Mechanical Stress
Controlled acceleration can reduce shock transmitted to:
- Couplings
- Gearboxes
- Belts
- Shafts
- Bearings
- Conveyor mechanisms
Controlled Stopping
Controlled stopping can be useful where sudden motor shutdown creates process or mechanical problems.
Suitable for Industrial Machinery
Soft-start technology can be useful for:
- Pumps
- Fans
- Compressors
- Conveyors
- Blowers
- Mixers
- Process equipment
Automation Integration
The starter can be incorporated into PLC-controlled systems using appropriate control signals and system architecture.
Robust Industrial Installation
The supplied 670 × 400 × 300 mm dimensions and 51.4 kg weight indicate that the ATS48C48Q requires appropriately engineered cabinet mounting and thermal management.
Technical FAQs
What is Schneider ATS48C48Q?
The ATS48C48Q is a Schneider Electric Altistart 48 electronic soft starter designed for three-phase asynchronous motor applications.
What is the main function of the ATS48C48Q?
Its primary purpose is to provide controlled motor starting and stopping while reducing electrical and mechanical stress.
What are its dimensions?
The supplied dimensions are:
670 × 400 × 300 mm
What is its weight?
The supplied weight is:
51.4 kg
Is ATS48C48Q a variable frequency drive?
No. It is a soft starter. It controls motor starting and stopping rather than providing continuous variable-frequency speed regulation.
Can the ATS48C48Q be used for pumps?
Yes. Pump systems are a common application for soft starters, particularly when controlled acceleration and stopping are required.
Can it be used for conveyors?
Yes. Controlled acceleration can reduce belt, gearbox, coupling, and mechanical shock.
Why does the motor fail to start?
Check incoming power, control commands, interlocks, motor wiring, starting configuration, motor condition, and mechanical load.
Why does the motor take too long to accelerate?
Possible causes include excessive load, insufficient starting torque, unsuitable starting parameters, mechanical resistance, or incorrect motor configuration.
Why does the motor overheat?
Possible causes include excessive load, frequent starting, excessive acceleration time, motor ventilation problems, mechanical friction, or incorrect configuration.
Why does the soft starter overheat?
Check motor current, starting frequency, cabinet ventilation, ambient temperature, airflow, contamination, and starter sizing.
Can a PLC control the ATS48C48Q?
Yes. The soft starter can be integrated into an industrial automation system using appropriate control signals.
Why is proper cabinet ventilation important?
The soft starter generates heat during operation. Inadequate ventilation can increase internal temperature and cause thermal protection or reduce component life.
What should be checked before replacing the starter?
Verify motor voltage, motor current, motor power, starting duty, number of starts, control architecture, cabinet dimensions, cooling requirements, and environmental conditions.
Installation Checklist
| Item | Verification |
|---|---|
| Manufacturer | Schneider Electric |
| Series | Altistart 48 |
| Model | ATS48C48Q |
| Product Type | Soft Starter |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Motor Voltage | Verified |
| Motor Current | Verified |
| Motor Power | Verified |
| Cabinet Space | Verified |
| Mounting | Verified |
| Ventilation | Verified |
| Grounding | Verified |
| Incoming Power | Verified |
| Motor Wiring | Verified |
| Control Wiring | Verified |
| PLC Interface | Verified |
| Starting Configuration | Completed |
| Stopping Configuration | Completed |
| Motor Rotation | Tested |
| No-Load Test | Completed |
| Load Test | Completed |
| Configuration Backup | Completed |
Troubleshooting Decision Flow
For a systematic diagnosis of the ATS48C48Q, follow this sequence:
Incoming Power
↓
Control Signal
↓
Starter Status
↓
Motor Wiring
↓
Motor Current
↓
Starting Configuration
↓
Mechanical Load
↓
Cooling
↓
Motor Condition
↓
Controlled Retest
This sequence helps determine whether a problem originates in the soft starter itself or somewhere else in the motor-control system.
Conclusion
The Schneider Electric ATS48C48Q Altistart 48 Soft Starter is an industrial electronic motor-starting solution intended for three-phase asynchronous motor applications where controlled acceleration and stopping are required. Rather than operating as a continuous variable-speed controller, it focuses on improving the starting and stopping characteristics of fixed-speed motor systems.
The supplied physical dimensions are 670 × 400 × 300 mm, with a supplied weight of 51.4 kg. These dimensions and weight should be taken into account when designing the electrical cabinet, selecting mounting hardware, planning lifting operations, and establishing maintenance access.
During installation, the most important factors are correct motor and electrical-system matching, appropriate protection, reliable grounding, adequate cabinet ventilation, correct motor wiring, and proper control integration. During commissioning, the motor nameplate should be verified, starting and stopping characteristics should be configured according to the mechanical load, and the machine should be tested progressively before full production operation.
For troubleshooting, the ATS48C48Q should be considered as one component of the complete motor-control system. Failure to start, excessive current, overheating, mechanical shock, phase loss, and intermittent faults may originate from the power supply, motor, starter configuration, PLC, control circuit, or mechanical load.
With correct sizing, installation, configuration, cooling, and preventive maintenance, the ATS48C48Q can provide controlled motor acceleration and stopping for demanding industrial equipment while helping reduce unnecessary electrical and mechanical stress.