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- Soft Starter
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- 670 x 400 x 300 mm
- 51.4 kg
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Product Overview
The Schneider Electric ATS48C59Q Altistart 48 Soft Starter is an industrial electronic motor-control device designed to provide controlled starting and stopping for three-phase asynchronous motors. It belongs to the Altistart 48 family and is intended for industrial machines where conventional direct-on-line starting may create excessive inrush current, mechanical shock, hydraulic pressure fluctuations, or unnecessary stress on the motor and driven equipment.
The principal role of the ATS48C59Q is to regulate the motor during the starting and stopping stages. Instead of immediately subjecting the motor to the full electrical starting condition, the soft starter provides a controlled acceleration process. Once the motor reaches normal operating conditions, the machine can continue running at its normal supply frequency.
This makes soft-start technology particularly useful for equipment such as pumps, fans, compressors, conveyors, blowers, mixers, and other fixed-speed industrial machinery.
The supplied dimensions of the Schneider ATS48C59Q are 670 × 400 × 300 mm, with a supplied weight of 51.4 kg. Because of its physical size and weight, installation should include appropriate mechanical support, lifting arrangements, cabinet clearance, electrical protection, and thermal management.
For product selection, the complete motor application must be evaluated. Motor voltage, motor current, power, starting duty, number of starts, acceleration time, load inertia, ambient temperature, and cabinet cooling all affect whether a soft starter is suitable.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Catalog Number | ATS48C59Q |
| Product Type | Soft Starter |
| Motor Type | Three-Phase Asynchronous Motor |
| Primary Function | Controlled Motor Starting and Stopping |
| Starting Technology | Electronic Soft Start |
| Stopping Technology | 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 | Cabinet Ventilation Required |
Technical Specifications
| Technical Item | Specification |
|---|---|
| Brand | Schneider Electric |
| Series | Altistart 48 |
| Model | ATS48C59Q |
| Product Category | Soft Starter |
| Motor Application | Three-Phase AC Motor |
| Starting Method | Controlled Electronic Starting |
| Stopping Method | Controlled Electronic Stopping |
| Dimensions | 670 × 400 × 300 mm |
| Weight | 51.4 kg |
| Installation Environment | Industrial Cabinet |
| Primary Purpose | Controlled Motor Acceleration and Deceleration |
| Typical Loads | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Thermal Management | Required |
| Maintenance | Electrical, Thermal, and Mechanical Inspection |
Understanding the ATS48C59Q
The ATS48C59Q is installed between the three-phase electrical supply and the motor.
A typical installation can be represented as:
Three-Phase Power Supply
↓
Disconnect / Protection
↓
ATS48C59Q
↓
Three-Phase AC Motor
↓
Mechanical Load
The soft starter manages the motor’s acceleration and stopping characteristics.
During acceleration, the motor voltage is progressively controlled to allow the motor to build speed smoothly.
During stopping, the starter can provide a controlled reduction in motor operation rather than allowing the motor to stop abruptly.
How a Soft Starter Works
A conventional direct-on-line motor starter connects the motor directly to the supply. Depending on the motor and load, this can result in a substantial starting current and high instantaneous torque.
A soft starter uses power electronics to manage the starting voltage.
The simplified sequence is:
Motor Stopped
↓
Start Command
↓
Controlled Initial Voltage
↓
Progressive Acceleration
↓
Motor Reaches Operating Speed
↓
Normal Operation
For stopping:
Stop Command
↓
Controlled Deceleration
↓
Motor Stops
This approach can improve the mechanical behavior of the machine and reduce the severity of electrical disturbances associated with starting large motors.
Why the ATS48C59Q Is Used in Industrial Systems
A soft starter can address several common problems associated with direct starting.
Electrical Benefits
Controlled starting can help reduce:
- Starting current
- Supply voltage disturbance
- Electrical stress
- Sudden load changes
Mechanical Benefits
Controlled acceleration can reduce:
- Coupling shock
- Gearbox stress
- Belt tension
- Shaft stress
- Bearing shock
- Mechanical vibration
Process Benefits
Controlled starting and stopping can improve process behavior in applications such as:
- Pumping
- Conveying
- Ventilation
- Compression
- Mixing
- Material handling
Soft Starter and Variable Frequency Drive Comparison
The ATS48C59Q should not be considered a substitute for every variable frequency drive application.
| Feature | ATS48C59Q Soft Starter | Variable Frequency Drive |
|---|---|---|
| Soft Starting | Yes | Yes |
| Soft Stopping | Yes | Yes |
| Continuous Speed Control | No | Yes |
| Variable Frequency | No | Yes |
| Reduced Starting Current | Yes | Yes |
| Fixed-Speed Motor Applications | Excellent | Suitable |
| Variable-Speed Applications | Not the Primary Purpose | Excellent |
| Main Function | Start/Stop Control | Speed/Torque Control |
A soft starter is particularly attractive when the motor normally operates at a fixed speed and the main requirement is a smoother starting and stopping process.
Industrial Applications
Pump Applications
Pump systems often benefit from controlled acceleration and deceleration.
A direct start may produce rapid hydraulic changes. A controlled start can reduce the severity of these transitions.
Typical applications include:
- Water treatment
- Industrial cooling
- Process pumping
- Water circulation
- Fluid transfer
- Irrigation
- Utility systems
For pump systems, stopping behavior can be just as important as starting behavior.
Conveyor Applications
Conveyors can contain substantial inertia, particularly when carrying heavy material.
Abrupt starting can produce:
- Belt shock
- Product movement
- Gearbox loading
- Coupling stress
- Mechanical vibration
A controlled acceleration profile can allow the conveyor to reach operating speed more progressively.
Fan Applications
Large industrial fans may have considerable rotating inertia.
The ATS48C59Q can be used in appropriately sized fixed-speed fan systems where controlled acceleration is required.
Applications can include:
- Exhaust fans
- Industrial ventilation
- Cooling systems
- Air-handling equipment
- Dust extraction
Compressor Applications
Compressors can create significant starting demands.
Before using a soft starter, engineers should evaluate:
- Motor current
- Compressor starting load
- Mechanical characteristics
- Starting frequency
- Acceleration requirements
- System pressure
- Thermal conditions
The soft starter should always be sized according to the complete application.
Mixer and Agitator Applications
Mixing machinery may require substantial starting torque.
This is particularly true when the material is:
- Dense
- Viscous
- Cold
- Settled
- Difficult to move
A controlled starting process can reduce sudden loading on the motor, gearbox, shaft, and coupling.
Material-Handling Equipment
The ATS48C59Q can also be considered for appropriately sized material-handling equipment.
Examples include:
- Conveyors
- Transfer systems
- Processing machines
- Bulk handling
- Industrial transport systems
The motor’s actual current and starting characteristics should always be used for final selection.
Installation Guide
1. Verify the Exact Model
Before installation, verify:
Schneider Electric ATS48C59Q
Check the product identification against:
- Electrical drawings
- Equipment documentation
- Replacement records
- Motor specifications
- Starter nameplate
Do not select a replacement based only on the Altistart 48 family name.
2. Inspect Before Installation
Check the soft starter for:
- Physical damage
- Cracked housing
- Damaged terminals
- Corrosion
- Moisture
- Contamination
- Loose hardware
- Signs of overheating
The unit should be in suitable condition before installation.
3. Cabinet Space
The supplied dimensions are:
670 × 400 × 300 mm
These dimensions describe the product size provided for this model, but the actual cabinet design should allow additional space.
Provide clearance for:
- Power cables
- Motor cables
- Control wiring
- Ventilation
- Maintenance
- Terminal access
- Inspection
- Equipment removal
4. Mechanical Mounting
The supplied weight is:
51.4 kg
The mounting structure must support the starter securely.
During installation:
- Use suitable lifting equipment.
- Ensure the unit is properly supported.
- Use correctly rated mounting hardware.
- Avoid stressing terminals.
- Keep cables from supporting the equipment mechanically.
5. Cabinet Thermal Design
The ATS48C59Q generates heat during operation.
The enclosure should provide sufficient heat dissipation.
Consider:
- Ambient temperature
- Starter losses
- Motor current
- Number of starts
- Other power equipment
- Fan capacity
- Filter condition
- Airflow
A cabinet with inadequate cooling can cause intermittent thermal faults.
6. Environmental Conditions
The installation environment should be evaluated for:
- Temperature
- Humidity
- Dust
- Oil
- Chemical contamination
- Condensation
- Vibration
- Altitude
- Air circulation
Heavy industrial contamination can affect electronic components and cooling systems.
7. Grounding
Connect the starter to the approved protective grounding system.
Verify:
- Starter ground
- Cabinet ground
- Motor ground
- Ground conductor continuity
- Electrical bonding
Good grounding is essential for electrical safety and reliable industrial operation.
8. Incoming Power
Connect the incoming three-phase power according to the approved electrical schematic.
Before energizing, verify:
- Supply voltage
- Phase configuration
- Protection
- Disconnect
- Cable size
- Terminal identification
- Terminal tightness
9. Motor Connection
Connect the motor according to the actual motor nameplate and approved wiring diagram.
Check:
- Motor voltage
- Motor current
- Frequency
- Phase connections
- Motor grounding
- Cable insulation
- Terminal tightness
10. Motor Data
Record the motor’s actual:
- Voltage
- Current
- Power
- Frequency
- Speed
- Connection
- Duty
The motor current is particularly important for soft-starter selection and configuration.
11. Control Wiring
Depending on the automation architecture, control wiring may include:
- Start
- Stop
- Fault reset
- Run feedback
- Fault feedback
- Interlock
- PLC signals
- Emergency-stop interface
Control wiring should be checked against the machine electrical drawings.
PLC Integration
The ATS48C59Q can operate within a PLC-controlled system.
A typical architecture is:
PLC
↓
Start / Stop Command
↓
ATS48C59Q
↓
AC Motor
↓
Machine
The PLC can manage the overall sequence while the soft starter handles the controlled motor-starting function.
Typical PLC monitoring points include:
- Starter ready
- Motor running
- Fault
- Interlock
- Process state
Commissioning Procedure
Step 1 — Mechanical Verification
Check:
- Mounting
- Cabinet support
- Clearance
- Ventilation
- Cable routing
- Grounding
Step 2 — Electrical Verification
Check:
- Incoming supply
- Motor wiring
- Protection
- Grounding
- Control circuit
Step 3 — Motor Configuration
Enter the actual motor information into the system configuration.
Never assume that a previous configuration is correct unless the motor is confirmed to be identical.
Step 4 — Configure the Starting Profile
Starting characteristics should match the application.
Consider:
- Load inertia
- Motor current
- Required acceleration
- Starting torque
- Number of starts
- Mechanical response
A heavily loaded conveyor may require a different starting strategy from a centrifugal fan.
Step 5 — Initial Start Test
Perform an initial controlled start.
Monitor:
- Current
- Motor acceleration
- Vibration
- Noise
- Starter status
- Motor temperature
If the motor fails to accelerate, investigate the cause before repeatedly modifying the starting parameters.
Step 6 — Rotation Test
Verify motor rotation before operating the machine at normal production speed.
Incorrect direction can cause serious problems in:
- Pumps
- Fans
- Compressors
- Conveyors
- Mixers
Step 7 — Stop Test
Verify the stopping behavior.
For pumps, watch for pressure fluctuations.
For conveyors, check:
- Belt behavior
- Mechanical shock
- Gearbox response
- Product stability
Step 8 — Full Load Test
Gradually apply the normal process load.
Monitor:
- Motor current
- Starter temperature
- Motor temperature
- Mechanical vibration
- Acceleration
- Stopping
- Process behavior
Troubleshooting Guide
ATS48C59Q Does Not Start
Check:
- Incoming power
- Start command
- Stop circuit
- Interlocks
- Control wiring
- Motor wiring
- Starter status
- Configuration
A fault in the control circuit can prevent starting even when the power section is healthy.
No Power
Possible causes include:
- Open disconnect
- Protective device trip
- Missing phase
- Incorrect wiring
- Loose connection
- Upstream electrical fault
Verify the complete power path.
Motor Does Not Accelerate
Possible causes:
- Excessive load
- Insufficient starting torque
- Incorrect motor wiring
- Incorrect configuration
- Motor problem
- Mechanical obstruction
Always check the driven equipment as well as the starter.
Motor Starts Too Slowly
Check:
- Starting settings
- Motor current
- Load inertia
- Mechanical resistance
- Motor condition
- Starter selection
A slow acceleration condition may indicate a load problem rather than a starter problem.
High Starting Current
Possible causes:
- Excessive load
- Incorrect starting profile
- Motor problem
- Incorrect motor information
- Incorrect starter sizing
- Supply limitations
Measure actual current and compare it with the motor nameplate.
Motor Starts Abruptly
If the expected soft-start behavior is not observed, investigate:
- Starting configuration
- Control mode
- Bypass contactor
- Control wiring
- Start command
- Starter status
Motor Stops Abruptly
Possible causes:
- Incorrect stopping configuration
- Control logic
- External contactor
- Stop command
- Mechanical load
Determine whether the motor is actually passing through the intended soft-stop process.
Soft Starter Overheats
Possible causes include:
- Excessive current
- Excessive starting frequency
- High ambient temperature
- Insufficient airflow
- Dirty cabinet filters
- Blocked cooling path
- Incorrect application sizing
Motor Overheats
Possible causes include:
- Excessive load
- Frequent starts
- Long acceleration
- Mechanical friction
- Motor cooling problem
- Incorrect motor parameters
- Motor fault
Phase Loss
Possible symptoms include:
- Poor acceleration
- Excessive current
- Motor heating
- Starter protection
- Abnormal motor operation
Inspect the supply and motor circuit from the source to the motor terminals.
Pump Pressure Fluctuation
If a pump experiences excessive pressure changes:
- Review starting behavior.
- Review stopping behavior.
- Inspect valves.
- Check piping.
- Inspect pump condition.
- Evaluate system characteristics.
The starter settings should be coordinated with the hydraulic system.
Conveyor Shock
If the conveyor still starts with excessive mechanical shock:
- Review acceleration.
- Inspect belt tension.
- Check couplings.
- Inspect gearbox condition.
- Check alignment.
- Evaluate the load.
Soft-start control cannot compensate for mechanical defects.
PLC Start Command Does Not Work
Check:
- PLC output
- Control wiring
- Start input
- Stop input
- Interlocks
- Fault status
- PLC logic
- Control configuration
Trace the command from the PLC to the starter.
Intermittent Faults
When the fault occurs only occasionally, record:
- Fault time
- Motor current
- Ambient temperature
- Motor temperature
- Number of starts
- Process load
- Supply voltage
A fault pattern can reveal thermal, electrical, mechanical, or process-related problems.
Preventive Maintenance
Electrical Inspection
Inspect periodically:
- Input terminals
- Motor terminals
- Grounding
- Control wiring
- Protective devices
Look for:
- Loose connections
- Heat marks
- Burn damage
- Corrosion
- Damaged insulation
Thermal Inspection
Inspect:
- Cabinet temperature
- Cooling fans
- Air filters
- Ventilation openings
- Air passages
- Dust accumulation
Thermal degradation can cause intermittent faults before complete failure occurs.
Motor Inspection
Check:
- Bearings
- Couplings
- Shaft
- Cooling
- Vibration
- Insulation
- Operating current
Mechanical Load Inspection
Inspect:
- Pumps
- Fans
- Conveyors
- Gearboxes
- Belts
- Couplings
- Bearings
- Shafts
An increase in mechanical resistance can increase motor current and produce starter trips.
Configuration Backup
After commissioning, document the final configuration.
Recommended records include:
- ATS48C59Q model
- Motor nameplate information
- Starting parameters
- Stopping parameters
- Control wiring
- PLC interface
- Application
- Commissioning date
This information can accelerate future troubleshooting and replacement.
Replacement Selection Guide
When selecting a replacement, verify the complete application.
| Parameter | 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 |
Physical dimensions alone are insufficient for selecting an equivalent soft starter.
Compatible System Components
| Component | Function |
|---|---|
| Schneider PLC | Machine control |
| HMI | Operator interface |
| Circuit Breaker | Power protection |
| Disconnect Switch | Electrical 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 |
Key Advantages
Controlled Acceleration
The ATS48C59Q can provide a progressive motor-starting process rather than an abrupt direct start.
Reduced Mechanical Shock
Controlled acceleration can reduce stress on:
- Gearboxes
- Couplings
- Belts
- Shafts
- Bearings
- Conveyor systems
Controlled Stopping
Soft stopping can help reduce sudden mechanical or process changes.
Broad Industrial Applications
The soft-starter concept is suitable for properly sized:
- Pumps
- Fans
- Compressors
- Conveyors
- Blowers
- Mixers
- Process machinery
Industrial Automation Integration
The starter can be incorporated into PLC-based control architectures.
Large Industrial Construction
The supplied 670 × 400 × 300 mm dimensions and 51.4 kg weight require appropriate cabinet design and mechanical support.
Technical FAQs
What is Schneider ATS48C59Q?
The ATS48C59Q is a Schneider Electric Altistart 48 soft starter for three-phase asynchronous motor applications.
What does ATS48C59Q do?
It controls motor starting and stopping to reduce the electrical and mechanical stress associated with direct starting.
What are the dimensions?
The supplied dimensions are:
670 × 400 × 300 mm
What is the weight?
The supplied weight is:
51.4 kg
Is ATS48C59Q a variable frequency drive?
No. It is an electronic soft starter rather than a variable frequency drive.
Can it be used for pumps?
Yes. Controlled starting and stopping can be beneficial for pump applications.
Can it be used for conveyors?
Yes. Controlled acceleration can help reduce mechanical shock in conveyor systems.
Why does the motor fail to start?
Possible causes include power loss, missing start command, interlocks, incorrect motor wiring, configuration problems, excessive load, or motor failure.
Why does the motor take too long to accelerate?
Possible causes include excessive mechanical load, insufficient starting torque, unsuitable configuration, mechanical friction, or incorrect starter sizing.
Why does the starter overheat?
Possible causes include excessive current, frequent starts, high ambient temperature, poor ventilation, blocked airflow, or an unsuitable application.
Why does the motor overheat?
Possible causes include excessive load, frequent starts, long acceleration, motor cooling problems, mechanical friction, or motor faults.
Can ATS48C59Q be controlled by a PLC?
Yes. It can be incorporated into a PLC-based industrial control system through the appropriate control interface.
What should be checked before replacement?
Verify motor voltage, current, power, starting duty, acceleration requirements, control architecture, environmental conditions, cooling, and cabinet dimensions.
Installation Checklist
| Item | Verification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48C59Q |
| 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 Parameters | Configured |
| Stopping Parameters | Configured |
| Motor Rotation | Tested |
| Initial Start | Completed |
| Load Test | Completed |
| Configuration Backup | Completed |
Troubleshooting Decision Flow
A structured troubleshooting process can be used:
Check Incoming Power
↓
Check Start / Stop Signals
↓
Check Starter Status
↓
Check Motor Wiring
↓
Check Motor Current
↓
Check Starting Configuration
↓
Check Mechanical Load
↓
Check Cabinet Cooling
↓
Check Motor Condition
↓
Perform Controlled Retest
This approach helps distinguish a soft-starter problem from an electrical, motor, PLC, or mechanical-system problem.
Conclusion
The Schneider Electric ATS48C59Q Altistart 48 Soft Starter is designed for industrial three-phase asynchronous motor applications where controlled acceleration and stopping are required. By managing the motor during the starting and stopping stages, the soft starter can help reduce starting current, mechanical shock, pressure fluctuations, and stress on mechanical transmission components.
The supplied dimensions of 670 × 400 × 300 mm and weight of 51.4 kg should be considered carefully during cabinet design, mounting, lifting, ventilation, and maintenance planning.
Successful installation depends on matching the starter to the actual motor and load, verifying the incoming electrical supply, providing suitable protection and grounding, maintaining adequate cooling, and correctly connecting the motor and control circuits.
During commissioning, the motor nameplate information should be verified, starting and stopping characteristics should be adjusted according to the application, and the machine should be tested progressively from initial startup to normal operating load.
For troubleshooting, the ATS48C59Q should always be evaluated as part of the complete motor-control system. Starting failures, excessive current, overheating, phase-loss conditions, communication problems, and mechanical shock may originate from the starter, motor, power supply, control system, or driven equipment.
With correct selection, installation, commissioning, and preventive maintenance, the ATS48C59Q can provide reliable controlled starting and stopping for demanding industrial motor applications.