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Product Overview

The Schneider Electric ATS48D22Q Altistart 48 Soft Starter is an industrial electronic motor-control device designed to provide controlled starting and stopping of three-phase asynchronous motors. It is intended for applications where direct-on-line starting may create excessive starting current, mechanical shock, belt or coupling stress, hydraulic disturbances, or unnecessary loading of the motor and driven machine.

The ATS48D22Q belongs to the Altistart 48 family and is installed within the motor power circuit. Its primary purpose is to manage motor acceleration and deceleration rather than provide continuous variable-speed control. This makes it particularly appropriate for fixed-speed industrial machinery that requires a smoother start and, where applicable, a controlled stop.

The supplied dimensions of the ATS48D22Q are 275 × 160 × 190 mm, with a supplied weight of 4.9 kg. These compact dimensions allow the unit to be incorporated into a variety of industrial electrical cabinets, provided adequate clearance, ventilation, cable access, and maintenance space are provided.

Typical applications include pumps, fans, conveyors, compressors, blowers, mixers, and other motor-driven equipment. Correct application should always consider the actual motor nameplate data, starting duty, load characteristics, number of starts, acceleration requirements, ambient conditions, and cabinet thermal design.

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Product Identification

Parameter	Specification
Manufacturer	Schneider Electric
Product Family	Altistart 48
Model	ATS48D22Q
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	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

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Technical Specifications

Technical Item	Specification
Brand	Schneider Electric
Series	Altistart 48
Catalog Number	ATS48D22Q
Product Category	Electronic Soft Starter
Motor Application	Three-Phase AC Motor
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 Requirement	Adequate Cabinet Ventilation
Maintenance	Electrical, Thermal, and Mechanical Inspection

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What Is the Schneider ATS48D22Q?

The ATS48D22Q is installed between the incoming three-phase electrical supply and the motor.

A simplified motor-control architecture is:

Three-Phase Power Supply

↓

Disconnect and Protection

↓

ATS48D22Q Soft Starter

↓

Three-Phase Motor

↓

Mechanical Load

When the motor receives a start command, the starter manages the acceleration process instead of allowing an uncontrolled direct start.

For applications requiring controlled stopping, the starter can also manage the motor’s deceleration behavior.

This approach helps create a smoother transition between stopped and running conditions.

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Operating Principle

Three-phase induction motors normally require significantly higher current during startup than during steady-state operation. Direct-on-line starting can therefore cause high electrical demand and sudden mechanical torque.

The ATS48D22Q uses electronic power control to manage the motor during this transition.

A simplified sequence is:

Motor Stopped

↓

Start Command

↓

Controlled Electrical Application

↓

Progressive Acceleration

↓

Normal Motor Operation

When controlled stopping is required:

Stop Command

↓

Controlled Deceleration

↓

Motor Stops

The actual starting and stopping characteristics should be selected according to the motor and mechanical load.

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Why Use ATS48D22Q?

Controlled Starting

The starter provides a more progressive motor acceleration process than a conventional direct-on-line start.

This can be useful for machinery with:

• High inertia
• Gearboxes
• Belt drives
• Couplings
• Large fans
• Pumps
• Conveyors

Reduced Mechanical Shock

A controlled acceleration profile can reduce sudden loading on:

• Motor shafts
• Bearings
• Couplings
• Gearboxes
• Belts
• Conveyor structures

Controlled Stopping

Controlled deceleration can be useful when abrupt motor shutdown could disturb the process or create excessive mechanical stress.

Industrial Automation Integration

The ATS48D22Q can be incorporated into hardwired motor-control systems or PLC-based automation architectures.

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Soft Starter vs. Variable Frequency Drive

The ATS48D22Q is not intended to function as a continuous variable-speed drive.

Feature	ATS48D22Q Soft Starter	Variable Frequency Drive
Controlled Starting	Yes	Yes
Controlled Stopping	Yes	Yes
Continuous Speed Control	No	Yes
Variable Frequency	No	Yes
Fixed-Speed Applications	Excellent	Suitable
Variable-Speed Applications	Not Primary	Excellent
Starting Current Management	Yes	Yes
Main Function	Start / Stop Control	Speed / Torque Control

If the machine normally operates at one speed and the main objective is to improve the starting and stopping process, a soft starter may be a practical choice.

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Industrial Applications

1. Pump Systems

Pumps can experience hydraulic disturbances when motors are started or stopped abruptly.

Controlled starting and stopping can help make the motor transition more gradual.

Potential applications include:

• Industrial water circulation
• Cooling-water systems
• Water treatment
• Process pumping
• Fluid transfer
• Utility pumping

Pump-specific hydraulic conditions should always be considered during commissioning.

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2. Conveyor Systems

Conveyors may have substantial mechanical inertia, particularly when transporting heavy materials.

Direct starting can produce:

• Belt shock
• Coupling stress
• Gearbox loading
• Material movement
• Mechanical vibration

Controlled acceleration can reduce the severity of these effects.

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3. Fans and Blowers

Fans and blowers can require considerable starting effort because of rotating inertia.

Typical applications include:

• Industrial ventilation
• Exhaust systems
• Dust collection
• Cooling systems
• Air-handling equipment

The starter should be selected according to actual motor current and operating duty.

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4. Compressor Systems

Compressors can present demanding starting conditions.

Before commissioning, evaluate:

• Motor current
• Compressor load
• Starting conditions
• Mechanical resistance
• Acceleration requirements
• Starting frequency
• System pressure

The complete compressor system should be evaluated rather than selecting the starter based solely on motor power.

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5. Mixers and Agitators

Mixers may require substantial starting torque, particularly when starting with material already inside the process vessel.

Controlled acceleration can reduce sudden stress on:

• Motor
• Gearbox
• Coupling
• Shaft
• Bearings

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Installation Guide

1. Confirm the Product

Verify the model:

Schneider Electric ATS48D22Q

Compare the unit against:

• Electrical drawings
• Motor nameplate
• Machine documentation
• Existing system configuration
• Replacement records

A similar-looking model should not automatically be considered electrically interchangeable.

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2. Inspect Before Installation

Check the starter for:

• Physical damage
• Cracked housing
• Damaged terminals
• Corrosion
• Moisture
• Contamination
• Loose hardware
• Signs of overheating

Do not proceed with installation if the equipment has obvious damage requiring further evaluation.

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3. Cabinet Space

The supplied product dimensions are:

275 × 160 × 190 mm

These dimensions represent the equipment envelope.

The cabinet should provide additional space for:

• Incoming power cables
• Motor cables
• Control wiring
• Ventilation
• Maintenance
• Terminal access
• Inspection

Do not install the starter directly against other heat-producing equipment unless the complete thermal design permits it.

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4. Mechanical Mounting

The supplied weight is:

4.9 kg

The cabinet mounting structure should safely support the starter and connected cabling.

Verify:

• Mounting surface
• Fasteners
• Cabinet rigidity
• Mechanical stability
• Cable routing

Avoid placing excessive mechanical force on electrical terminals.

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5. Thermal Management

The ATS48D22Q generates heat during operation.

Cabinet thermal calculations should consider:

• Motor current
• Starting frequency
• Ambient temperature
• Cabinet volume
• Other heat-generating equipment
• Cooling fans
• Airflow
• Filter condition

Poor ventilation can lead to thermal protection or reduced component life.

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6. Environmental Conditions

Evaluate:

• Ambient temperature
• Humidity
• Dust
• Oil
• Chemical exposure
• Condensation
• Vibration
• Altitude
• Cabinet ventilation

A clean, dry, and appropriately ventilated cabinet helps maintain reliable operation.

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7. Grounding

Connect the ATS48D22Q to the appropriate protective grounding system.

Verify:

• Starter grounding
• Cabinet grounding
• Motor grounding
• Ground conductor continuity
• Electrical bonding

Grounding should be confirmed before energization.

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8. Incoming Power

Connect the incoming three-phase supply according to the approved electrical schematic.

Before energization, verify:

• Supply voltage
• Phase arrangement
• Protection
• Disconnect equipment
• Cable sizing
• Terminal identification
• Terminal tightness

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9. Motor Connection

Connect the motor according to the actual motor nameplate and approved wiring design.

Verify:

• Rated motor voltage
• Rated motor current
• Frequency
• Phase configuration
• Motor grounding
• Cable insulation
• Terminal condition

Incorrect motor connections can produce excessive current or poor acceleration.

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10. Control Wiring

The control circuit may contain:

• Start
• Stop
• Fault reset
• Run feedback
• Fault feedback
• Interlocks
• PLC commands
• Emergency-stop logic

The actual control architecture must follow the machine’s approved electrical design.

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PLC Integration

The ATS48D22Q can be integrated into an industrial PLC-based motor-control system.

A simplified arrangement is:

PLC

↓

Start / Stop Logic

↓

ATS48D22Q

↓

Three-Phase Motor

↓

Machine Process

The PLC controls the machine sequence while the soft starter performs the controlled motor-starting function.

Possible monitoring signals include:

• Ready
• Running
• Fault
• Interlock
• Process status

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Commissioning Procedure

Step 1 — Mechanical Inspection

Verify:

• Mounting
• Cabinet clearance
• Ventilation
• Cable routing
• Grounding
• Mechanical stability

---

Step 2 — Electrical Inspection

Check:

• Incoming power
• Motor connections
• Protection
• Grounding
• Control wiring

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Step 3 — Verify Motor Information

Confirm:

• Motor voltage
• Motor current
• Motor power
• Frequency
• Speed
• Connection
• Duty

The actual motor nameplate should be used for configuration and application verification.

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Step 4 — Configure Starting Parameters

Starting behavior should correspond to the mechanical application.

Evaluate:

• Motor current
• Load inertia
• Starting torque
• Acceleration time
• Number of starts
• Process requirements

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Step 5 — Initial Start

Perform the first motor start under controlled conditions.

Monitor:

• Motor current
• Acceleration
• Starter status
• Vibration
• Noise
• Motor temperature

If the motor does not accelerate normally, stop the test and investigate.

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Step 6 — Verify Rotation

Confirm correct motor rotation.

This is especially important for:

• Pumps
• Fans
• Compressors
• Conveyors
• Mixers

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Step 7 — Test Stopping

Verify:

• Stop command
• Motor response
• Mechanical behavior
• Process response
• Fault status

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Step 8 — Full Load Test

Gradually introduce normal process load.

Monitor:

• Motor current
• Starter temperature
• Motor temperature
• Vibration
• Acceleration
• Stopping behavior
• Process stability

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Troubleshooting Guide

ATS48D22Q Does Not Start

Check:

1. Incoming power
2. Start command
3. Stop circuit
4. Interlocks
5. Control wiring
6. Starter status
7. Motor wiring
8. Configuration
9. Mechanical load

A PLC interlock or external stop circuit can prevent starting even when the starter is healthy.

---

No Incoming Power

Possible causes:

• Open disconnect
• Tripped protective device
• Missing phase
• Incorrect wiring
• Loose terminal
• Upstream electrical problem

Trace the supply from the source to the starter.

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Motor Does Not Accelerate

Possible causes include:

• Excessive mechanical load
• Insufficient starting torque
• Incorrect motor wiring
• Incorrect configuration
• Motor fault
• Mechanical obstruction
• Incorrect starter selection

Inspect both the electrical and mechanical systems.

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Motor Accelerates Too Slowly

Check:

• Starting parameters
• Motor current
• Load inertia
• Mechanical friction
• Motor condition
• Starting duty
• Starter suitability

A slow start can result from excessive mechanical resistance rather than an electronic fault.

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Excessive Starting Current

Potential causes include:

• Heavy mechanical load
• Incorrect starting configuration
• Motor fault
• Incorrect motor data
• Incorrect starter sizing
• Supply limitations

Measure actual motor current during startup whenever possible.

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Motor Starts Abruptly

If the motor does not show the expected controlled acceleration, inspect:

• Starting configuration
• Control mode
• Bypass arrangement
• Contactors
• Control wiring
• Start command

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Motor Stops Abruptly

Check:

• Stopping configuration
• Stop signal
• External switching devices
• PLC logic
• Mechanical load

Determine whether the starter or an external contactor is actually controlling the motor shutdown.

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Starter Overheats

Possible causes:

• Excessive motor current
• Frequent starting
• High ambient temperature
• Poor cabinet ventilation
• Blocked airflow
• Dirty filters
• Incorrect application sizing

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Motor Overheats

Potential causes:

• Excessive mechanical load
• Frequent starts
• Excessively long acceleration
• Mechanical friction
• Poor motor cooling
• Incorrect configuration
• Motor deterioration

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Phase-Loss Condition

Possible symptoms:

• Poor acceleration
• Excessive current
• Motor heating
• Protective trips
• Abnormal motor operation

Inspect:

• Incoming power
• Terminals
• Motor cables
• Starter connections
• Motor terminals

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Pump Pressure Fluctuation

If a pump system develops excessive pressure variation:

• Review acceleration.
• Review stopping behavior.
• Inspect valves.
• Check piping.
• Inspect pump condition.
• Evaluate the hydraulic system.

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Conveyor Starting Shock

If mechanical shock remains excessive:

• Review acceleration.
• Check belt tension.
• Inspect couplings.
• Check gearbox condition.
• Verify alignment.
• Evaluate load distribution.

Starter settings cannot compensate for mechanical defects.

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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 output through the complete control circuit.

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Intermittent Faults

Record:

• Fault occurrence time
• Motor current
• Ambient temperature
• Motor temperature
• Number of starts
• Process load
• Supply conditions
• Cabinet temperature

Comparing operating conditions can help identify thermal, electrical, mechanical, or process-related problems.

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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 increase operating temperature.

---

Motor Maintenance

Inspect:

• Bearings
• Couplings
• Shaft
• Cooling
• Vibration
• Insulation
• Operating current

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Mechanical Load Maintenance

Inspect the driven equipment for:

• Bearing wear
• Gearbox problems
• Belt problems
• Coupling wear
• Pump resistance
• Fan obstruction
• Shaft misalignment
• Mechanical blockage

Increasing mechanical resistance can raise motor current and starter thermal loading.

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Configuration Backup

After successful commissioning, maintain a record of the final system configuration.

Recommended documentation includes:

• ATS48D22Q model
• Motor nameplate information
• Starting parameters
• Stopping parameters
• Control wiring
• PLC interface
• Application type
• Commissioning date
• Maintenance records

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Replacement Selection Guide

When replacing an ATS48D22Q, 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.

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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 component selection depends on the machine architecture.

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Key Advantages

Controlled Acceleration

The ATS48D22Q provides a controlled motor-starting process that can reduce abrupt electrical and mechanical loading.

Reduced Mechanical Stress

Controlled acceleration can reduce stress on:

• Couplings
• Gearboxes
• Belts
• Shafts
• Bearings
• Conveyor mechanisms

Controlled Stopping

Controlled deceleration can help reduce abrupt mechanical and process transitions where the application requires it.

Compact Cabinet Integration

With supplied dimensions of 275 × 160 × 190 mm and a supplied weight of 4.9 kg, the ATS48D22Q can be integrated into compact industrial control cabinets when appropriate clearances and thermal management are provided.

Fixed-Speed Motor Control

The soft starter is well suited to applications where the motor normally runs at a fixed speed and controlled starting is the primary requirement.

PLC Compatibility

The ATS48D22Q can form part of PLC-based industrial automation systems using the appropriate control architecture.

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Technical FAQs

What is Schneider ATS48D22Q?

The ATS48D22Q is a Schneider Electric Altistart 48 electronic soft starter for three-phase asynchronous motor applications.

What is the main function of ATS48D22Q?

Its main function is to provide controlled motor acceleration and stopping instead of an abrupt direct-on-line start.

What are the dimensions of ATS48D22Q?

The supplied dimensions are:

275 × 160 × 190 mm

What is the weight of ATS48D22Q?

The supplied weight is:

4.9 kg

Is ATS48D22Q a variable frequency drive?

No. It is a soft starter. Its primary purpose is controlled starting and stopping rather than continuous motor-speed regulation.

Can ATS48D22Q be used for pumps?

Yes. Pump systems can benefit from controlled motor starting and stopping when the starter is correctly matched to the motor and hydraulic load.

Can ATS48D22Q be used for conveyors?

Yes. Controlled acceleration can reduce mechanical shock in suitable conveyor applications.

Why does the motor fail to start?

Check the incoming power, start and stop 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?

Potential causes include excessive mechanical load, frequent starts, long acceleration, mechanical friction, poor cooling, incorrect configuration, or motor degradation.

Can ATS48D22Q be integrated with a PLC?

Yes. It can be incorporated into a PLC-based motor-control system through the appropriate control interface.

What should be checked before replacing ATS48D22Q?

Verify motor voltage, current, power, starting duty, number of starts, acceleration requirements, control architecture, cabinet dimensions, thermal conditions, and environmental requirements.

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Installation Checklist

Item	Verification
Manufacturer	Schneider Electric
Product Family	Altistart 48
Model	ATS48D22Q
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

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Troubleshooting Decision Flow

For systematic diagnosis, use the following sequence:

Incoming Power

↓

Start / Stop Signals

↓

Interlocks

↓

Starter Status

↓

Motor Wiring

↓

Motor Current

↓

Starting Configuration

↓

Mechanical Load

↓

Cabinet Cooling

↓

Motor Condition

↓

Controlled Retest

This sequence helps distinguish faults originating from the soft starter from problems involving the power supply, PLC, motor, control circuit, or mechanical equipment.

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Conclusion

The Schneider Electric ATS48D22Q Altistart 48 Soft Starter is an industrial motor-control solution designed to provide controlled starting and stopping for appropriately selected three-phase asynchronous motors. It is particularly useful in fixed-speed applications where direct-on-line starting can create excessive current, mechanical shock, vibration, or process disturbances.

The supplied 275 × 160 × 190 mm dimensions and 4.9 kg weight make the ATS48D22Q a relatively compact industrial soft-starter unit. Even with its compact form, correct cabinet clearance, ventilation, electrical protection, grounding, and maintenance access remain essential for reliable operation.

Installation should begin with verification of the actual motor and load requirements. Motor voltage, rated current, starting duty, acceleration requirements, number of starts, mechanical inertia, environmental conditions, and cabinet thermal characteristics should be evaluated before commissioning.

When troubleshooting, the ATS48D22Q should be considered as one component within the complete motor-control system. Starting failures, excessive current, overheating, phase-loss conditions, slow acceleration, and intermittent faults may result from the power supply, control circuit, PLC, motor, starter configuration, or mechanical load.

With appropriate selection, installation, commissioning, thermal management, and preventive maintenance, the ATS48D22Q can provide dependable controlled motor starting and stopping for industrial automation equipment and fixed-speed motor-driven machinery.