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- Schneider ATS48C66Q
- Soft Starter
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- 670 x 400 x 300 mm
- 51.4 kg
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Product Overview
The Schneider Electric ATS48C66Q Altistart 48 Soft Starter is an industrial electronic motor-control device designed for controlled starting and stopping of three-phase asynchronous motors. It is intended for applications where direct-on-line starting may generate excessive starting current, mechanical shock, hydraulic disturbances, or unnecessary stress on motor-driven equipment.
The ATS48C66Q belongs to the Altistart 48 soft-starter family and is typically integrated between the incoming three-phase power supply and the motor. Its primary function is to manage the motor during acceleration and deceleration rather than continuously regulate motor speed like a variable frequency drive.
This type of motor control is useful for industrial equipment including pumps, fans, conveyors, compressors, blowers, mixers, and other fixed-speed machinery.
The supplied dimensions for the ATS48C66Q are 670 × 400 × 300 mm, with a supplied weight of 51.4 kg. The physical size and weight should be considered when designing the electrical cabinet, mounting structure, lifting arrangement, ventilation system, and maintenance access.
For engineering and replacement purposes, the complete motor application should be evaluated rather than relying solely on the model number. Motor voltage, rated current, load characteristics, acceleration requirements, starting frequency, environmental conditions, and cabinet thermal design all affect correct application.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48C66Q |
| Product Type | Soft Starter |
| Motor Type | Three-Phase Asynchronous Motor |
| Primary Function | Controlled Motor Starting and Stopping |
| Starting Method | Electronic Soft Start |
| Stopping Method | Controlled Soft Stop |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Installation | Industrial Electrical Cabinet |
| Typical Applications | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Control Integration | PLC / HMI / Hardwired Control |
| Cooling | Adequate Cabinet Ventilation Required |
Technical Specifications
| Technical Item | Specification |
|---|---|
| Brand | Schneider Electric |
| Series | Altistart 48 |
| Catalog Number | ATS48C66Q |
| Product Category | Electronic Soft Starter |
| Motor Application | Three-Phase AC Motor |
| Starting Function | Controlled Acceleration |
| Stopping Function | Controlled Deceleration |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Installation Environment | Industrial Cabinet |
| Main Purpose | Motor Start/Stop Control |
| Typical Load Types | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Thermal Management | Required |
| Maintenance | Electrical, Thermal, and Mechanical Inspection |
What Is the Schneider ATS48C66Q?
The ATS48C66Q is installed as part of a motor-control circuit.
A simplified architecture is:
Three-Phase AC Supply
↓
Disconnect / Protection
↓
ATS48C66Q Soft Starter
↓
Three-Phase Motor
↓
Mechanical Load
When a start command is received, the soft starter controls the motor’s acceleration instead of subjecting the motor to an abrupt direct connection.
During stopping, the starter can provide a controlled deceleration sequence when the application requires it.
The result is a more controlled transition between the stopped and running states.
Operating Principle
A three-phase induction motor can draw significantly more current during starting than during normal operation. Direct-on-line starting can therefore create electrical and mechanical disturbances.
A soft starter uses power electronic switching to control the electrical conditions applied to the motor during acceleration.
The basic sequence is:
Motor Stopped
↓
Start Command
↓
Controlled Electrical Application
↓
Progressive Motor Acceleration
↓
Operating Speed
↓
Normal Motor Operation
During stopping:
Stop Command
↓
Controlled Deceleration
↓
Motor Stops
The appropriate settings depend on the motor, mechanical load, starting requirements, and machine process.
Why Use a Soft Starter?
Electrical Considerations
Direct starting can cause:
- High starting current
- Supply voltage disturbances
- Electrical stress
- Sudden changes in power demand
A soft starter can make the transition into operation more controlled.
Mechanical Considerations
Abrupt starting may place additional stress on:
- Couplings
- Gearboxes
- Belts
- Shafts
- Bearings
- Conveyor structures
Controlled acceleration can reduce the severity of these mechanical transients.
Process Considerations
Soft starting and stopping can also improve processes where abrupt motor transitions are undesirable.
Examples include:
- Pump pressure control
- Conveyor material handling
- Fan acceleration
- Compressor startup
- Mixer operation
ATS48C66Q vs. Variable Frequency Drive
The ATS48C66Q should be distinguished from a variable frequency drive.
| Feature | ATS48C66Q Soft Starter | Variable Frequency Drive |
|---|---|---|
| Soft Start | Yes | Yes |
| Soft Stop | Yes | Yes |
| Continuous Speed Control | No | Yes |
| Variable Frequency Output | No | Yes |
| Starting Current Management | Yes | Yes |
| Fixed-Speed Applications | Excellent | Suitable |
| Variable-Speed Applications | Not Primary | Excellent |
| Main Purpose | Starting / Stopping | Speed / Torque Regulation |
When the motor normally operates at one fixed speed and the primary objective is controlled starting and stopping, a soft starter can be an appropriate solution.
Industrial Applications
1. Pump Systems
Pump systems can experience hydraulic disturbances when motors start or stop abruptly.
A controlled acceleration sequence can reduce the severity of these changes.
Potential applications include:
- Water treatment
- Cooling-water systems
- Industrial circulation
- Process pumping
- Fluid transfer
- Irrigation
- Utility pumping
Stopping characteristics should also be evaluated because some pump systems are sensitive to abrupt shutdown.
2. Conveyor Systems
Large conveyors may contain substantial mechanical inertia.
Direct starting can result in:
- Belt shock
- Coupling stress
- Gearbox loading
- Product movement
- Mechanical vibration
Controlled acceleration allows the conveyor to reach its operating condition more progressively.
3. Fan and Blower Systems
Fans and blowers may contain large rotating masses.
A controlled start can reduce the mechanical stress associated with rapid acceleration.
Potential applications include:
- Industrial ventilation
- Exhaust systems
- Dust collection
- Cooling systems
- Air-handling equipment
4. Compressor Systems
Compressors can present demanding motor-starting conditions.
Before applying a soft starter, evaluate:
- Motor current
- Compressor load
- Starting conditions
- Starting frequency
- Acceleration requirements
- Mechanical characteristics
- System pressure
The starter must be correctly matched to the motor and application.
5. Mixers and Agitators
Mixers may require substantial starting torque, especially when starting with material already inside the vessel.
Controlled starting can reduce sudden stress on:
- Gearboxes
- Couplings
- Shafts
- Motor bearings
- Mechanical transmission systems
6. Material-Handling Equipment
The ATS48C66Q can be incorporated into suitable material-handling applications such as:
- Conveyors
- Transfer systems
- Bulk handling
- Processing equipment
- Industrial machinery
Actual motor current and mechanical duty should be used when selecting the starter.
Installation Guide
1. Verify the Product
Confirm the unit identification:
Schneider Electric ATS48C66Q
Before installation, compare the product with:
- Machine drawings
- Motor specifications
- Electrical schematics
- Replacement documentation
- Existing system configuration
Do not assume that similar Altistart models are interchangeable.
2. Inspect the Unit
Inspect the ATS48C66Q for:
- Physical damage
- Damaged terminals
- Cracks
- Corrosion
- Moisture
- Contamination
- Loose hardware
- Signs of overheating
Do not install equipment showing obvious damage until its condition has been evaluated.
3. Cabinet Planning
The supplied product dimensions are:
670 × 400 × 300 mm
The cabinet must provide sufficient space around the starter rather than fitting it into the exact product envelope.
Allow room for:
- Power cables
- Motor cables
- Control wiring
- Ventilation
- Maintenance
- Inspection
- Terminal access
- Equipment removal
4. Mounting and Mechanical Support
The supplied weight is:
51.4 kg
The cabinet structure must safely support this weight.
Installation should include:
- Suitable mounting hardware
- Adequate cabinet reinforcement
- Appropriate lifting equipment
- Secure mechanical fixation
- Accessible service space
Do not allow electrical cables to mechanically support the starter.
5. Ventilation and Thermal Management
Power electronics generate heat during operation.
The cabinet thermal design should account for:
- Motor current
- Starting frequency
- Ambient temperature
- Other heat-producing equipment
- Cabinet volume
- Fan capacity
- Filter condition
- Air circulation
Poor ventilation can cause thermal protection to operate and may reduce equipment service life.
6. Environmental Assessment
Before installation, evaluate:
- Ambient temperature
- Humidity
- Dust
- Oil
- Chemical contamination
- Condensation
- Vibration
- Altitude
- Ventilation
In harsh industrial environments, contamination can affect both electronics and cooling performance.
7. Grounding
Connect the ATS48C66Q to the appropriate protective grounding system.
Verify:
- Starter grounding
- Cabinet grounding
- Motor grounding
- Ground conductor continuity
- Electrical bonding
Proper grounding contributes to electrical safety and reliable operation.
8. Incoming Power
Connect the incoming three-phase supply according to the approved electrical design.
Before energization, verify:
- Supply voltage
- Phase arrangement
- Protective devices
- Disconnect equipment
- Cable sizing
- Terminal identification
- Terminal tightness
Never rely only on the physical appearance of the starter when determining the required supply.
9. Motor Connection
Connect the motor according to the actual motor nameplate and approved electrical schematic.
Verify:
- Motor voltage
- Motor current
- Frequency
- Phase connections
- Grounding
- Cable insulation
- Terminal condition
Incorrect motor wiring can result in poor acceleration or excessive current.
10. Record Motor Data
Record the motor nameplate information:
- Rated voltage
- Rated current
- Rated power
- Frequency
- Speed
- Connection
- Duty
The rated motor current is especially important when assessing starter suitability.
11. Control Circuit
The control circuit may include:
- Start
- Stop
- Fault reset
- Run feedback
- Fault feedback
- Interlock
- PLC control
- Emergency-stop logic
The actual wiring must follow the machine’s electrical design.
PLC Integration
The ATS48C66Q can be incorporated into an industrial automation system.
A simplified architecture is:
PLC
↓
Start / Stop Commands
↓
ATS48C66Q
↓
AC Motor
↓
Machine
The PLC manages the machine sequence while the soft starter provides the required motor-starting function.
The control system may monitor:
- Starter ready
- Motor running
- Fault
- Interlock
- Process sequence
Commissioning Procedure
Step 1 — Mechanical Inspection
Verify:
- Mounting
- Mechanical support
- Clearance
- Ventilation
- Cable routing
- Grounding
Step 2 — Electrical Inspection
Check:
- Incoming power
- Motor wiring
- Protection
- Grounding
- Control wiring
Step 3 — Verify Motor Parameters
Confirm that the motor information used for configuration matches the actual motor nameplate.
Do not copy parameters from another machine unless the motor and application are confirmed to be equivalent.
Step 4 — Configure Starting Behavior
Starting parameters should reflect the mechanical load.
Consider:
- Motor current
- Load inertia
- Starting torque
- Required acceleration time
- Number of starts
- Process requirements
Step 5 — Initial Start
Perform the first motor start under controlled conditions.
Monitor:
- Motor current
- Acceleration
- Vibration
- Noise
- Starter status
- Motor temperature
If the motor does not accelerate correctly, stop and investigate.
Step 6 — Verify Rotation
Confirm correct motor rotation.
Incorrect direction can be particularly problematic for:
- Pumps
- Fans
- Compressors
- Conveyors
- Mixers
Step 7 — Test Stopping
Verify the stopping sequence.
Observe:
- Mechanical behavior
- Motor response
- Process response
- Pump pressure
- Conveyor movement
- Fault status
Step 8 — Full Load Test
After successful initial testing, gradually introduce normal operating load.
Monitor:
- Motor current
- Starter temperature
- Motor temperature
- Vibration
- Acceleration
- Stopping
- Process performance
Troubleshooting Guide
ATS48C66Q Does Not Start
Check:
- Incoming power
- Start command
- Stop circuit
- Interlocks
- Control wiring
- Starter status
- Motor wiring
- Configuration
A missing control signal can prevent operation even when the power section is functional.
No Incoming Power
Possible causes include:
- Open disconnect
- Tripped breaker
- Protective-device operation
- Missing phase
- Incorrect power wiring
- Loose terminal
- Upstream electrical fault
Trace the power circuit from the source toward the starter.
Motor Does Not Accelerate
Possible causes:
- Excessive load
- Insufficient starting torque
- Incorrect motor wiring
- Incorrect configuration
- Motor fault
- Mechanical obstruction
Inspect both the electrical and mechanical systems.
Motor Accelerates Too Slowly
Investigate:
- Starting settings
- Motor current
- Load inertia
- Mechanical friction
- Motor condition
- Starter selection
A slow start does not necessarily mean the soft starter has failed.
Excessive Starting Current
Possible causes:
- Excessive load
- Incorrect starting configuration
- Motor problem
- Incorrect motor data
- Incorrect starter selection
- Supply limitations
Measure the actual current and compare it with the motor’s rated current.
Motor Starts Abruptly
If the expected controlled-start behavior is absent, inspect:
- Starter configuration
- Control mode
- Bypass arrangement
- Contactors
- Control wiring
- Start signal
Motor Stops Abruptly
Check:
- Stopping configuration
- Stop command
- External contactors
- PLC logic
- Mechanical load
Determine whether the motor is actually passing through the intended stopping sequence.
Starter Overheats
Possible causes:
- Excessive motor current
- Frequent starts
- High ambient temperature
- Insufficient ventilation
- Blocked airflow
- Dirty filters
- Incorrect starter selection
Motor Overheats
Potential causes include:
- Excessive mechanical load
- Too many starts
- Long acceleration
- Mechanical friction
- Motor cooling failure
- Incorrect motor parameters
- Motor degradation
Phase-Loss Condition
Potential symptoms include:
- Poor acceleration
- Excessive current
- Motor heating
- Protective trips
- Abnormal operation
Inspect the complete power circuit and motor connections.
Pump Pressure Surge
If a pump system experiences excessive pressure fluctuation:
- Review starting settings.
- Review stopping behavior.
- Inspect valves.
- Check piping.
- Inspect the pump.
- Evaluate hydraulic system characteristics.
Conveyor Mechanical Shock
If a conveyor continues to experience severe starting shock:
- Review acceleration.
- Check belt tension.
- Inspect coupling.
- Check gearbox.
- Verify alignment.
- Evaluate load distribution.
A soft starter cannot compensate for mechanical defects.
PLC Cannot Start the Starter
Check:
- PLC output
- Control voltage
- Start signal
- Stop signal
- Interlocks
- Fault status
- PLC program
- Control wiring
Trace the signal step by step from the PLC to the starter.
Intermittent Fault
Record:
- Fault time
- Motor current
- Ambient temperature
- Motor temperature
- Number of starts
- Process load
- Supply condition
Comparing these conditions can help identify thermal, electrical, mechanical, or process-related causes.
Preventive Maintenance
Electrical Maintenance
Inspect:
- Power terminals
- Motor terminals
- Ground connections
- Control wiring
- Protective devices
Look for:
- Loose connections
- Discoloration
- Burn marks
- Corrosion
- Insulation damage
Thermal Maintenance
Check:
- Cabinet temperature
- Cooling fans
- Air filters
- Ventilation openings
- Air passages
- Dust accumulation
Thermal problems can initially appear as intermittent faults.
Motor Maintenance
Regularly inspect:
- Bearings
- Couplings
- Shaft
- Cooling
- Vibration
- Insulation
- Operating current
Mechanical Load Maintenance
Inspect:
- Bearings
- Gearboxes
- Belts
- Couplings
- Pumps
- Fans
- Conveyor mechanisms
- Shafts
An increase in mechanical resistance can cause increased motor current and starter protection.
Configuration Documentation
After successful commissioning, record the final configuration.
Recommended documentation includes:
- ATS48C66Q model
- Motor nameplate data
- Starting settings
- Stopping settings
- Control wiring
- PLC interface
- Application type
- Commissioning date
Maintaining this information simplifies future troubleshooting and replacement.
Replacement Selection Guide
When replacing an ATS48C66Q, verify the complete electrical and mechanical application.
| 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 physically similar starter should not be assumed to be electrically equivalent.
Compatible System Components
| Component | Typical Function |
|---|---|
| Schneider PLC | Machine control |
| HMI | Operator interface |
| Circuit Breaker | Electrical protection |
| Disconnect Switch | Isolation |
| Contactor | Switching / bypass |
| Three-Phase Motor | Mechanical power |
| Motor Protection | Motor protection |
| Sensors | Process feedback |
| Control Relay | Interlocking |
| Industrial Cabinet | Equipment enclosure |
| Cooling Fan | Thermal management |
The actual system architecture depends on the machine and application.
Key Advantages
Controlled Acceleration
The ATS48C66Q provides a controlled transition from the stopped state to normal motor operation.
Reduced Mechanical Shock
A controlled starting process can reduce stress on:
- Couplings
- Gearboxes
- Belts
- Shafts
- Bearings
- Conveyor mechanisms
Controlled Stopping
Soft stopping can help reduce abrupt process and mechanical transitions.
Industrial Applications
The soft starter concept is appropriate for properly selected:
- Pumps
- Fans
- Compressors
- Conveyors
- Blowers
- Mixers
- Process equipment
PLC Integration
The starter can be incorporated into automated machine-control systems.
Industrial Cabinet Installation
The supplied 670 × 400 × 300 mm dimensions and 51.4 kg weight require appropriate cabinet support, clearance, ventilation, and maintenance access.
Technical FAQs
What is Schneider ATS48C66Q?
The ATS48C66Q is a Schneider Electric Altistart 48 electronic soft starter intended for three-phase asynchronous motor applications.
What is the main purpose of ATS48C66Q?
Its primary purpose is to provide controlled motor starting and stopping while reducing the electrical and mechanical stress associated with direct starting.
What are the dimensions of ATS48C66Q?
The supplied dimensions are:
670 × 400 × 300 mm
How much does ATS48C66Q weigh?
The supplied weight is:
51.4 kg
Is ATS48C66Q a variable frequency drive?
No. It is a soft starter designed primarily for controlled acceleration and deceleration rather than continuous variable-speed operation.
Can ATS48C66Q be used with pumps?
Yes. Pump systems are an important application area for controlled motor starting and stopping.
Can ATS48C66Q be used with conveyors?
Yes. A controlled acceleration process can reduce mechanical shock in conveyor systems.
Why does the motor fail to start?
Check incoming power, start/stop signals, interlocks, motor wiring, starter configuration, motor condition, and mechanical load.
Why does the motor start slowly?
Possible causes include excessive load, unsuitable starting parameters, insufficient starting torque, mechanical friction, or incorrect starter selection.
Why does the starter overheat?
Check motor current, starting frequency, ambient temperature, cabinet airflow, cooling fans, filters, and application sizing.
Why does the motor overheat?
Possible causes include excessive load, frequent starts, long acceleration, motor cooling problems, mechanical friction, or motor faults.
Can a PLC control ATS48C66Q?
Yes. The starter can be incorporated into a PLC-based motor-control system through the appropriate control interface.
What should be checked before replacing ATS48C66Q?
Verify motor voltage, current, power, starting duty, number of starts, acceleration requirements, control architecture, cabinet dimensions, cooling, and environmental conditions.
Installation Checklist
| Item | Verification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48C66Q |
| 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 |
| Mechanical Mounting | Verified |
| Ventilation | Verified |
| Grounding | Verified |
| Incoming Power | Verified |
| Motor Wiring | Verified |
| Control Wiring | Verified |
| PLC Interface | Verified |
| Starting Parameters | Configured |
| Stopping Parameters | Configured |
| Motor Rotation | Tested |
| Initial Start | Completed |
| Load Test | Completed |
| Configuration Backup | Completed |
Troubleshooting Decision Flow
For systematic troubleshooting, follow the sequence below:
Incoming Power
↓
Start / Stop Signals
↓
Starter Status
↓
Motor Wiring
↓
Motor Current
↓
Starting Configuration
↓
Mechanical Load
↓
Cabinet Cooling
↓
Motor Condition
↓
Controlled Retest
This approach helps determine whether the problem originates in the soft starter, electrical supply, control system, motor, or driven equipment.
Conclusion
The Schneider Electric ATS48C66Q Altistart 48 Soft Starter is an industrial motor-control solution designed to provide controlled acceleration and stopping for three-phase asynchronous motors. It is particularly useful in fixed-speed applications where direct-on-line starting can create excessive current, mechanical shock, hydraulic disturbances, or process instability.
The supplied dimensions of 670 × 400 × 300 mm and weight of 51.4 kg make cabinet planning, mechanical support, lifting, ventilation, and maintenance access important considerations during installation.
Correct application begins with matching the soft starter to the actual motor and mechanical load. Engineers should verify motor voltage, rated current, starting duty, acceleration requirements, number of starts, environmental conditions, and thermal requirements before commissioning.
During troubleshooting, the ATS48C66Q should be evaluated as part of the entire motor-control system. A failure to start, excessive current, overheating, phase-loss condition, abrupt acceleration, or intermittent fault may originate from the power supply, control circuit, motor, starter configuration, PLC, or mechanical equipment.
With appropriate selection, installation, commissioning, cooling, and preventive maintenance, the ATS48C66Q can provide controlled motor starting and stopping for demanding industrial applications while helping reduce electrical and mechanical stress throughout the machine system.