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- Soft Starter
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- 275 × 160 × 190 mm
- 4.9 kg
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Product Overview
The Schneider Electric ATS48D17Q Altistart 48 Soft Starter is an industrial motor-control device designed to provide controlled starting and stopping for three-phase asynchronous motors. It is intended for fixed-speed motor applications where direct-on-line starting may result in high starting current, mechanical shock, excessive torque, or undesirable process disturbances.
As part of the Altistart 48 family, the ATS48D17Q is installed within the motor power circuit and manages the motor during acceleration and, where required, deceleration. Unlike a variable frequency drive, its primary purpose is not continuous speed regulation. Instead, it provides a controlled transition between stopped and running conditions.
The supplied dimensions of the ATS48D17Q are 275 × 160 × 190 mm, with a supplied weight of 4.9 kg. Its relatively compact form makes it suitable for integration into industrial control cabinets where controlled motor starting is required without the larger footprint of high-power soft-starter assemblies.
Typical applications include pumps, fans, conveyors, compressors, blowers, mixers, and other industrial machines using appropriately sized three-phase motors.
Correct application requires more than simply matching the starter to motor horsepower. Motor rated voltage, current, starting duty, load inertia, acceleration time, number of starts, ambient temperature, cabinet cooling, and control architecture should all be considered during selection and commissioning.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Product Family | Altistart 48 |
| Model | ATS48D17Q |
| Product Type | Soft Starter |
| Motor Type | Three-Phase Asynchronous Motor |
| Main Function | Controlled Motor Starting and Stopping |
| Starting Method | Electronic Soft Start |
| Stopping Method | Controlled Soft Stop |
| Dimensions | 275 × 160 × 190 mm |
| Weight | 4.9 kg |
| Installation | Industrial Electrical Cabinet |
| Typical Applications | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Control Integration | PLC / HMI / Hardwired Control |
| Thermal Management | Required |
Technical Specifications
| Technical Item | Specification |
|---|---|
| Brand | Schneider Electric |
| Series | Altistart 48 |
| Catalog Number | ATS48D17Q |
| Product Category | Electronic Soft Starter |
| Application | Three-Phase AC Motor Control |
| Starting Function | Controlled Acceleration |
| Stopping Function | Controlled Deceleration |
| Dimensions | 275 × 160 × 190 mm |
| Weight | 4.9 kg |
| Installation Environment | Industrial Control Cabinet |
| Typical Load Types | Pumps, Fans, Conveyors, Compressors, Blowers, Mixers |
| Control System | PLC / HMI / Hardwired |
| Cooling | Adequate Cabinet Ventilation Required |
| Maintenance | Electrical, Thermal, and Mechanical Inspection |
What Is the ATS48D17Q?
The ATS48D17Q is an electronic soft starter installed between the three-phase power supply and an appropriately selected motor.
A simplified motor-control arrangement is:
Three-Phase Supply
↓
Protection / Disconnect
↓
ATS48D17Q
↓
Three-Phase Motor
↓
Mechanical Load
When the motor receives a start command, the soft starter controls its acceleration instead of applying the full starting condition immediately.
During stopping, the starter can provide controlled deceleration when required by the application.
This operating method is particularly useful when the machine needs a smoother transition into and out of operation.
Operating Principle
A three-phase induction motor normally draws significantly more current during startup than during steady-state operation. Direct-on-line starting can therefore place substantial demand on the electrical supply and mechanical system.
The soft starter manages the motor-starting process using power electronic control.
The simplified sequence is:
Motor Stopped
↓
Start Command
↓
Controlled Starting Condition
↓
Progressive Acceleration
↓
Motor Reaches Operating Condition
↓
Normal Running
For controlled stopping:
Stop Command
↓
Controlled Deceleration
↓
Motor Stops
The appropriate configuration depends on the motor and driven load.
Main Functions
Controlled Acceleration
The ATS48D17Q can provide a more gradual acceleration process than direct-on-line starting.
This is valuable for machinery with:
- High inertia
- Belt drives
- Gearboxes
- Long shafts
- Pumps
- Large fans
- Mechanical couplings
Controlled Deceleration
Where required, controlled stopping can reduce abrupt transitions when the motor is switched off.
Reduced Mechanical Shock
A controlled starting profile can reduce sudden forces applied to:
- Bearings
- Couplings
- Gearboxes
- Belts
- Shafts
- Conveyor systems
Industrial Motor Integration
The ATS48D17Q can be integrated into conventional hardwired control systems as well as PLC-based automation architectures.
Soft Starter vs. Variable Frequency Drive
The ATS48D17Q should not be confused with a variable frequency drive.
| Feature | ATS48D17Q Soft Starter | Variable Frequency Drive |
|---|---|---|
| Controlled Starting | Yes | Yes |
| Controlled Stopping | Yes | Yes |
| Continuous Speed Regulation | No | Yes |
| Variable Frequency | No | Yes |
| Fixed-Speed Motor | Well Suited | Suitable |
| Variable-Speed Process | Not Primary | Well Suited |
| Starting Current Control | Yes | Yes |
| Primary Function | Start / Stop Control | Speed / Torque Control |
For a machine that normally runs at one fixed speed and only requires controlled starting and stopping, a soft starter can be an efficient control solution.
Industrial Applications
Pump Applications
Pump motors can produce hydraulic disturbances when started or stopped abruptly.
Controlled starting can help create a smoother transition.
Suitable applications may include:
- Water circulation
- Industrial pumping
- Cooling systems
- Water treatment
- Process fluid transfer
- Utility pumping
Stopping behavior should also be evaluated because certain hydraulic systems are sensitive to rapid motor shutdown.
Conveyor Applications
Conveyors can contain substantial mechanical inertia, especially when carrying heavy materials.
Direct starting can produce:
- Belt shock
- Gearbox stress
- Coupling stress
- Material movement
- Mechanical vibration
A controlled acceleration process can help reduce these effects.
Fan Applications
Fans and blowers can require considerable starting effort because of rotating inertia.
Potential applications include:
- Industrial ventilation
- Exhaust systems
- Cooling fans
- Dust collection
- Air-handling systems
The starter should be selected according to the motor and actual operating duty.
Compressor Applications
Compressors may present demanding starting conditions.
Before commissioning, evaluate:
- Motor current
- Compressor load
- Mechanical resistance
- Starting frequency
- Acceleration requirements
- System pressure
The complete application must be considered when determining suitability.
Mixer Applications
Mixers and agitators can require substantial starting torque, especially when material is already present.
Controlled starting can reduce stress on:
- Motor
- Gearbox
- Coupling
- Shaft
- Bearings
Installation Guide
1. Confirm Product Identification
Verify:
Schneider Electric ATS48D17Q
Compare the product with:
- Electrical drawings
- Motor data
- Machine documentation
- Existing control configuration
- Replacement records
Do not assume another Altistart model is interchangeable simply because it has similar dimensions.
2. Pre-Installation Inspection
Inspect the ATS48D17Q for:
- Physical damage
- Damaged terminals
- Cracks
- Corrosion
- Moisture
- Contamination
- Loose hardware
- Signs of overheating
The starter should be inspected before connection to the electrical system.
3. Cabinet Space
The supplied dimensions are:
275 × 160 × 190 mm
These dimensions should be used as the equipment envelope when planning the cabinet.
Additional space should be provided for:
- Power cables
- Motor cables
- Control wiring
- Ventilation
- Maintenance
- Terminal access
- Inspection
Do not design the enclosure with zero clearance around the equipment.
4. Mechanical Mounting
The supplied weight is:
4.9 kg
The mounting structure should safely support the starter.
Verify:
- Mounting surface
- Fasteners
- Cabinet structure
- Mechanical stability
- Cable routing
Avoid placing mechanical strain on the electrical terminals.
5. Thermal Management
The soft starter generates heat during operation.
Cabinet design should consider:
- Motor current
- Starting frequency
- Ambient temperature
- Cabinet size
- Other heat-generating devices
- Ventilation
- Cooling fan capacity
- Air filters
Insufficient cooling can result in thermal protection or reduced equipment service life.
6. Environmental Assessment
Evaluate the installation environment for:
- Temperature
- Humidity
- Dust
- Oil
- Chemical contamination
- Condensation
- Vibration
- Altitude
- Air circulation
Clean and adequately ventilated cabinet conditions help maintain reliable operation.
7. Grounding
Connect the starter to the appropriate protective grounding system.
Verify:
- Starter grounding
- Cabinet grounding
- Motor grounding
- Ground conductor continuity
- Electrical bonding
Grounding should be checked before energizing the equipment.
8. Incoming Power
Connect the incoming three-phase supply according to the approved electrical schematic.
Before energization, verify:
- Supply voltage
- Phase configuration
- Protection
- Disconnect
- Cable size
- Terminal identification
- Terminal tightness
9. Motor Wiring
Connect the motor according to its actual nameplate and approved wiring diagram.
Verify:
- Motor voltage
- Motor current
- Frequency
- Phase connections
- Grounding
- Cable condition
- Terminal connections
10. Control Wiring
A typical control circuit may contain:
- Start command
- Stop command
- Fault reset
- Run feedback
- Fault feedback
- Interlocks
- PLC signals
- Emergency-stop logic
Control wiring must correspond to the machine’s electrical design.
PLC Integration
The ATS48D17Q can be incorporated into a PLC-controlled motor system.
A simplified architecture is:
PLC
↓
Start / Stop Logic
↓
ATS48D17Q
↓
Three-Phase Motor
↓
Machine
The PLC can control the operating sequence while the soft starter handles the motor-starting process.
Typical signals may include:
- Ready
- Running
- Fault
- Interlock
- Process status
Commissioning Procedure
Step 1 — Mechanical Verification
Check:
- Mounting
- Cabinet clearance
- Ventilation
- Cable routing
- Grounding
- Mechanical stability
Step 2 — Electrical Verification
Check:
- Incoming power
- Motor wiring
- Protection
- Grounding
- Control circuit
Step 3 — Verify Motor Data
Record and confirm:
- Motor voltage
- Motor current
- Motor power
- Frequency
- Speed
- Connection
- Duty
The actual motor nameplate should be used rather than assumed values.
Step 4 — Configure Starting Behavior
Starting characteristics should correspond to the mechanical application.
Consider:
- Load inertia
- Starting torque
- Motor current
- Acceleration time
- Number of starts
- Process requirements
Step 5 — Perform Initial Start
Start the motor under controlled conditions.
Monitor:
- Motor current
- Acceleration
- Vibration
- Noise
- Starter status
- Motor temperature
If acceleration is abnormal, stop the test and investigate before repeated starts.
Step 6 — Verify Rotation
Confirm that the motor rotates in the correct direction.
This is particularly important for:
- Pumps
- Fans
- Compressors
- Conveyors
- Mixers
Step 7 — Test Stop Sequence
Verify:
- Stop command
- Motor response
- Mechanical behavior
- Process response
- Fault status
Step 8 — Full Load Test
Gradually apply the normal operating load.
Monitor:
- Motor current
- Starter temperature
- Motor temperature
- Vibration
- Acceleration
- Stopping behavior
- Process stability
Troubleshooting Guide
ATS48D17Q Does Not Start
Check:
- Incoming power
- Start command
- Stop circuit
- Interlocks
- Control wiring
- Starter status
- Motor wiring
- Configuration
- Mechanical load
A control interlock can prevent operation even when the starter itself is functional.
No Incoming Power
Possible causes include:
- Open disconnect
- Tripped protective device
- Missing phase
- Incorrect wiring
- Loose terminal
- Upstream electrical fault
Trace the power circuit systematically.
Motor Does Not Accelerate
Potential causes:
- Excessive load
- Insufficient starting torque
- Incorrect motor wiring
- Incorrect configuration
- Motor fault
- Mechanical obstruction
- Incorrect starter selection
Inspect both electrical and mechanical conditions.
Motor Accelerates Too Slowly
Check:
- Starting parameters
- Motor current
- Load inertia
- Mechanical friction
- Motor condition
- Starting duty
- Starter suitability
A slow acceleration problem may originate from the driven machine rather than the starter.
Excessive Starting Current
Possible causes include:
- Heavy mechanical load
- Incorrect starting configuration
- Motor fault
- Incorrect motor data
- Incorrect starter selection
- Supply limitations
Measure actual current during starting whenever possible.
Motor Starts Abruptly
If the expected soft-start behavior is not present, inspect:
- Starting configuration
- Control mode
- Bypass arrangement
- Contactors
- Control wiring
- Start command
Motor Stops Abruptly
Check:
- Stopping configuration
- Stop signal
- External contactor
- PLC logic
- Mechanical load
Determine whether the abrupt stop originates from the starter or an external switching device.
Starter Overheats
Potential causes:
- Excessive current
- Frequent starts
- High ambient temperature
- Poor ventilation
- Blocked airflow
- Dirty cabinet filters
- Incorrect application sizing
Motor Overheats
Possible causes include:
- Excessive load
- Frequent starts
- Long acceleration
- Mechanical friction
- Poor motor cooling
- Incorrect configuration
- Motor degradation
Phase-Loss Condition
Potential symptoms:
- Poor acceleration
- Excessive current
- Motor heating
- Protective trips
- Abnormal motor operation
Inspect:
- Incoming supply
- Power terminals
- Motor cables
- Starter connections
- Motor terminals
Pump Pressure Problems
If a pump system experiences pressure fluctuations:
- Review acceleration behavior.
- Review stopping behavior.
- Inspect valves.
- Check piping.
- Inspect pump condition.
- Evaluate hydraulic characteristics.
Conveyor Shock
If mechanical shock remains excessive:
- Review acceleration.
- Check belt tension.
- Inspect couplings.
- Check gearbox condition.
- Verify alignment.
- Evaluate load distribution.
The soft starter cannot correct mechanical defects.
PLC Start Command Failure
Check:
- PLC output
- Control voltage
- Start signal
- Stop signal
- Interlocks
- Fault status
- PLC logic
- Control wiring
Trace the command from the PLC to the starter.
Intermittent Faults
Record:
- Fault time
- Motor current
- Ambient temperature
- Motor temperature
- Number of starts
- Process load
- Supply conditions
- Cabinet temperature
Comparing these values can help identify thermal, electrical, mechanical, or process-related causes.
Preventive Maintenance
Electrical Maintenance
Inspect:
- Incoming power terminals
- Motor terminals
- Ground connections
- Control wiring
- Protective devices
Look for:
- Loose connections
- Heat discoloration
- Burn marks
- Corrosion
- Damaged insulation
Thermal Maintenance
Inspect:
- Cooling fans
- Ventilation openings
- Air filters
- Air passages
- Dust accumulation
- Cabinet temperature
Restricted airflow can gradually create thermal problems.
Motor Maintenance
Inspect:
- Bearings
- Couplings
- Shaft
- Cooling system
- Vibration
- Insulation
- Operating current
Mechanical Load Maintenance
Inspect the driven machine for:
- Bearing wear
- Gearbox problems
- Belt problems
- Coupling wear
- Pump resistance
- Fan obstruction
- Shaft misalignment
- Mechanical blockage
Increasing mechanical resistance can increase motor current and starter thermal loading.
Configuration Backup
After commissioning, document the final configuration.
Recommended information includes:
- ATS48D17Q model
- Motor nameplate information
- Starting parameters
- Stopping parameters
- Control wiring
- PLC interface
- Application
- Commissioning date
- Maintenance records
Keeping accurate records simplifies future troubleshooting and replacement.
Replacement Selection Guide
When replacing an ATS48D17Q, verify the complete 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 Requirements | Required |
| Communication | Required |
| Cabinet Dimensions | Required |
| Cooling | Required |
| Environmental Conditions | Required |
| Mounting | Required |
Physical dimensions alone do not establish electrical compatibility.
Compatible System Components
| Component | Typical 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 Device | Motor protection |
| Sensors | Process feedback |
| Control Relay | Interlocking |
| Industrial Cabinet | Equipment enclosure |
| Cooling Fan | Thermal management |
The exact components depend on the machine’s electrical architecture.
Key Advantages
Controlled Acceleration
The ATS48D17Q can provide progressive motor acceleration, helping reduce abrupt electrical and mechanical loading.
Reduced Mechanical Stress
Controlled starting can reduce stress on:
- Couplings
- Gearboxes
- Belts
- Shafts
- Bearings
- Conveyors
Controlled Stopping
Controlled deceleration can reduce abrupt transitions in appropriate applications.
Compact Industrial Installation
The supplied 275 × 160 × 190 mm dimensions and 4.9 kg weight make the ATS48D17Q suitable for compact industrial cabinet integration when its electrical rating matches the application.
Fixed-Speed Motor Applications
The soft starter is particularly useful where the motor normally operates at a fixed speed.
PLC Integration
The ATS48D17Q can be incorporated into PLC-controlled motor systems using the appropriate control architecture.
Technical FAQs
What is Schneider ATS48D17Q?
The ATS48D17Q is a Schneider Electric Altistart 48 electronic soft starter designed for three-phase asynchronous motor applications.
What is the purpose of ATS48D17Q?
It provides controlled motor starting and stopping to reduce abrupt electrical and mechanical transitions.
What are the dimensions of ATS48D17Q?
The supplied dimensions are:
275 × 160 × 190 mm
What is the weight of ATS48D17Q?
The supplied weight is:
4.9 kg
Is ATS48D17Q a variable frequency drive?
No. It is a soft starter designed primarily for controlled acceleration and deceleration rather than continuous speed control.
Can ATS48D17Q be used for pumps?
Yes. Pumps are a common type of application for soft starters when the motor and starter are correctly matched.
Can it be used for conveyors?
Yes. Controlled acceleration can help reduce mechanical shock in suitable conveyor applications.
Why does the motor not start?
Check incoming power, control signals, interlocks, motor wiring, starter status, configuration, motor condition, and mechanical load.
Why does the motor accelerate too slowly?
Possible causes include excessive load, insufficient starting torque, unsuitable starting parameters, mechanical friction, or incorrect starter selection.
Why does the starter overheat?
Check motor current, starting frequency, ambient temperature, cabinet ventilation, airflow, filters, and application sizing.
Why does the motor overheat?
Possible causes include excessive load, frequent starts, long acceleration, mechanical friction, poor cooling, incorrect configuration, or motor faults.
Can ATS48D17Q be integrated with a PLC?
Yes. The starter can be incorporated into a PLC-based industrial motor-control system using the appropriate control interface.
What should be checked before replacing ATS48D17Q?
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 | ATS48D17Q |
| Product Type | Soft Starter |
| Dimensions | 275 × 160 × 190 mm |
| Weight | 4.9 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 |
| Full Load Test | Completed |
| Configuration Backup | Completed |
Troubleshooting Decision Flow
Use the following sequence when diagnosing an ATS48D17Q installation:
Incoming Power
↓
Start / Stop Signals
↓
Interlocks
↓
Starter Status
↓
Motor Wiring
↓
Motor Current
↓
Starting Configuration
↓
Mechanical Load
↓
Cabinet Cooling
↓
Motor Condition
↓
Controlled Retest
This process helps determine whether a fault originates from the starter, power supply, PLC, motor, wiring, or driven machinery.
Conclusion
The Schneider Electric ATS48D17Q Altistart 48 Soft Starter is an industrial motor-control solution designed to provide controlled acceleration and stopping for appropriately selected three-phase asynchronous motors. It is particularly useful for fixed-speed machinery where direct-on-line starting can cause excessive current, mechanical shock, vibration, or process disturbances.
With supplied dimensions of 275 × 160 × 190 mm and a supplied weight of 4.9 kg, the ATS48D17Q offers a relatively compact installation footprint for industrial motor-control cabinets. Nevertheless, adequate clearance, ventilation, grounding, electrical protection, and maintenance access remain essential.
Successful installation begins with verifying the actual motor and load requirements. Motor voltage, rated current, starting duty, acceleration requirements, number of starts, environmental conditions, and cabinet thermal characteristics should all be evaluated before commissioning.
For troubleshooting, the ATS48D17Q should be considered as one part of the complete motor-control system. Starting failures, excessive current, overheating, phase-loss conditions, slow acceleration, or intermittent faults may originate from the power supply, control circuit, motor, starter configuration, PLC, or mechanical equipment.
With correct selection, installation, commissioning, thermal management, and preventive maintenance, the ATS48D17Q can provide reliable controlled motor starting and stopping for a wide range of industrial automation and fixed-speed motor applications.