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Product Overview

The Schneider ATS48C11Q Soft Starter is an industrial motor-control device from the Altistart 48 family, designed for controlled starting and stopping of three-phase asynchronous motors. It is intended to reduce the electrical and mechanical impact that can occur when a large motor is started directly across the line.

Instead of allowing the motor to experience an abrupt transition from standstill to full operating conditions, the soft starter progressively controls the starting process. This can help reduce mechanical shock, limit starting disturbances, and provide smoother operation for connected equipment.

The ATS48C11Q is suitable for a variety of industrial applications, including pumps, fans, compressors, conveyors, mixers, blowers, and other rotating machinery. It can also be incorporated into automation systems where motor status, start/stop commands, fault information, and communication are required.

For the product specified in this article, the physical dimensions are 290 × 190 × 235 mm, with a weight of 8.3 kg.

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Product Identification

Parameter	Specification
Manufacturer	Schneider Electric
Product Family	Altistart 48
Model	ATS48C11Q
Product Type	Soft Starter
Motor Type	Three-Phase Asynchronous Motor
Control Function	Motor Starting and Stopping
Communication	Modbus RS-485
Installation Position	Vertical
Dimensions	290 × 190 × 235 mm
Weight	8.3 kg
Typical Applications	Pumps, Fans, Compressors, Conveyors, Mixers
Installation Environment	Industrial Control Cabinet

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Technical Specifications

Technical Item	ATS48C11Q
Manufacturer	Schneider Electric
Series	Altistart 48
Model	ATS48C11Q
Product Category	Soft Starter
Motor Application	Three-Phase Asynchronous Motor
Main Function	Controlled Motor Starting and Stopping
Communication Interface	RS-485
Communication Protocol	Modbus
Physical Connector	RJ45
Installation	Vertical
Height	290 mm
Width	190 mm
Depth	235 mm
Weight	8.3 kg
Typical Load Types	Pumps, Fans, Compressors, Conveyors, Mixers
Control System Integration	PLC / HMI / Industrial Automation

The ATS48C11Q uses forced-air cooling and provides control and protection functions intended for industrial motor-starting applications.

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How the ATS48C11Q Works

A conventional direct-on-line starter applies the supply voltage to the motor almost immediately. Depending on the motor and mechanical load, this can produce a substantial starting current and a sudden torque increase.

The ATS48C11Q introduces controlled starting between the electrical supply and the motor:

Three-Phase Power Supply

↓

ATS48C11Q Soft Starter

↓

Three-Phase Motor

↓

Mechanical Load

During acceleration, the soft starter manages the electrical conditions applied to the motor. This allows the motor to accelerate progressively toward normal operating speed.

During stopping, the soft starter can also provide controlled deceleration where the application requires it.

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Main Functions

Controlled Motor Starting

The primary purpose of the ATS48C11Q is to provide a controlled motor-starting process.

This can help reduce:

• Starting shock
• Mechanical stress
• Belt tension changes
• Coupling stress
• Gearbox shock
• Process disturbances

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Controlled Stopping

Some industrial machines require a gradual reduction in speed rather than an immediate motor stop.

Controlled stopping can be useful for:

• Pump systems
• Conveyors
• Fans
• Process machinery
• High-inertia rotating equipment

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Motor Protection

The ATS48 platform incorporates protection functions intended to monitor motor and starter operating conditions.

Protection functions can help identify abnormal conditions such as:

• Motor thermal overload
• Starter overheating
• Phase-related faults
• Abnormal operating conditions

Protection parameters should always be configured according to the actual motor and application.

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Modbus Communication

The ATS48C11Q provides a communication interface for industrial automation integration.

A typical architecture can be:

PLC

↓

Modbus RS-485

↓

ATS48C11Q

↓

Motor

This allows the soft starter to participate in a larger control system.

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Industrial Applications

Pump Systems

The ATS48C11Q can be used with suitable industrial pumping equipment.

Typical applications include:

• Water circulation
• Cooling systems
• Process pumps
• Industrial transfer pumps
• Wastewater systems

A controlled starting and stopping process can help reduce sudden changes in the mechanical and fluid system.

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Fan and Blower Systems

Large fans and blowers can contain considerable rotating inertia.

Applications include:

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

Controlled acceleration can reduce sudden mechanical loading on the fan and transmission system.

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Compressor Systems

Compressors can place substantial demands on the motor during startup.

The ATS48C11Q can be considered for suitable compressor applications where the motor and soft-starter ratings are properly matched.

Before commissioning, engineers should consider:

• Motor rated current
• Compressor loading
• Starting time
• Starting frequency
• Mechanical resistance
• Ambient temperature

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Conveyor Systems

Conveyors can experience significant mechanical shock when large motors are started abruptly.

A controlled acceleration sequence can help reduce:

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

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Mixer Applications

Mixers may have high starting resistance, particularly when processing heavy or viscous materials.

A soft starter can provide a more controlled transition from standstill to normal operating speed.

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Industrial Blowers

Industrial blowers can have large rotating masses and may require a controlled acceleration profile.

The ATS48C11Q can be incorporated into suitable blower systems where the motor current and application duty are within the required operating range.

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Installation Guide

1. Verify the Model

Before installation, confirm the equipment identification:

Schneider ATS48C11Q

Check the physical condition of the unit.

Inspect for:

• Cracked housing
• Damaged terminals
• Bent mounting points
• Loose components
• Moisture
• Contamination
• Signs of impact damage

Do not install equipment with obvious physical damage until it has been inspected.

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2. Verify Motor Compatibility

Before configuring the soft starter, collect the motor nameplate information.

Important parameters include:

• Motor voltage
• Rated current
• Rated frequency
• Rated power
• Motor connection
• Motor speed
• Duty cycle
• Starting requirements

The soft starter should be selected and configured according to the actual motor current and application duty.

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3. Plan the Cabinet

The specified ATS48C11Q dimensions are:

290 × 190 × 235 mm

The cabinet should not be designed around these dimensions alone.

Additional space is required for:

• Incoming cables
• Motor cables
• Control wiring
• Protective devices
• Ventilation
• Cable bending
• Maintenance
• Inspection

The equipment should have adequate airflow around the cooling path.

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4. Mounting Orientation

Install the ATS48C11Q in the recommended vertical position.

Verify:

• Stable mounting
• Correct orientation
• Adequate ventilation
• Clearance from heat-producing equipment
• Accessibility of terminals
• Adequate maintenance space

Avoid mounting the soft starter immediately above another major heat source.

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5. Environmental Conditions

Install the soft starter inside a suitable industrial enclosure.

Protect it from:

• Water
• Condensation
• Excessive dust
• Conductive contamination
• Oil mist
• Corrosive gases
• Excessive vibration
• Excessive ambient heat

The cabinet should be designed to maintain an appropriate operating environment.

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6. Electrical Safety

Before wiring:

1. Disconnect the incoming power.
2. Apply lockout/tagout procedures.
3. Verify the absence of hazardous voltage.
4. Isolate the motor.
5. Confirm stored electrical energy has been discharged where applicable.
6. Verify the circuit is safe.
7. Use appropriate electrical PPE.

Never work on energized power terminals.

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7. Mechanical Installation

Secure the ATS48C11Q to the control-panel mounting structure.

The supplied weight is:

8.3 kg

The mounting hardware and panel structure must therefore be capable of supporting the equipment under normal operating conditions.

Check that the unit cannot move or vibrate excessively after installation.

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8. Power Wiring

Connect the incoming three-phase supply and motor circuit according to the engineered electrical design.

Before energizing, verify:

• Phase wiring
• Motor connections
• Cable sizing
• Protective devices
• Grounding
• Terminal tightness
• Cable insulation

A complete visual inspection should be performed before power is applied.

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9. Control Wiring

Typical control signals can include:

• Start
• Stop
• Reset
• Run status
• Fault status
• External interlocks
• PLC commands
• Emergency-stop logic

Separate control wiring appropriately from high-current power conductors to reduce electrical interference.

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10. Communication Wiring

The ATS48C11Q can be integrated into automation systems through its Modbus communication interface.

A typical system can include:

PLC → RS-485 Network → ATS48C11Q

Before commissioning communication, verify:

• Network wiring
• Device address
• Communication speed
• Communication parameters
• PLC configuration
• Control permissions
• Status monitoring

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11. Configure Motor Parameters

Enter the actual motor information into the soft starter.

Typical configuration areas include:

• Motor rated current
• Starting parameters
• Acceleration time
• Deceleration time
• Current limitation
• Protection settings
• Stop mode
• Control source

Do not simply copy parameters from another motor application.

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12. Inspect the Mechanical Load

Before starting the motor, inspect the connected machinery.

Check:

• Shaft alignment
• Coupling
• Bearings
• Gearbox
• Belts
• Pump
• Fan
• Conveyor
• Mechanical guards

Make sure the load can rotate normally without unexpected resistance.

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Commissioning Procedure

Pre-Energization Inspection

Before applying power:

1. Verify motor data.
2. Inspect power wiring.
3. Inspect control wiring.
4. Check protective grounding.
5. Verify circuit protection.
6. Check mechanical installation.
7. Verify ventilation.
8. Confirm soft-starter settings.
9. Check interlocks.
10. Verify emergency-stop functions.

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Initial Power-Up

After completing the inspection:

1. Energize the system.
2. Observe the ATS48C11Q status.
3. Check for fault indications.
4. Verify control signals.
5. Check communication if applicable.
6. Confirm the expected control mode.

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First Motor Start

Perform the first motor start under controlled conditions.

Monitor:

• Motor current
• Acceleration time
• Motor noise
• Vibration
• Soft-starter status
• Mechanical movement
• Process response

If abnormal behavior is observed, stop the motor and investigate before attempting another start.

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Troubleshooting Guide

Problem 1 – ATS48C11Q Does Not Power Up

Possible Causes

• Incoming power unavailable
• Circuit protection open
• Incorrect wiring
• Control supply problem
• Internal equipment fault

Diagnostic Procedure

Check:

1. Incoming supply
2. Circuit protection
3. Power wiring
4. Control supply
5. Soft-starter status

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Problem 2 – Motor Does Not Start

Possible Causes

• No start command
• Incorrect control wiring
• Active interlock
• Incorrect configuration
• Motor fault
• Mechanical obstruction

Recommended Action

Trace the start command from the PLC, HMI, relay, or external control circuit.

Then verify the motor power circuit and mechanical load.

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Problem 3 – Motor Starts but Does Not Accelerate Normally

Possible Causes

• Excessive mechanical load
• Incorrect acceleration settings
• Current limitation too restrictive
• Incorrect motor parameters
• Mechanical obstruction

Corrective Action

Check the configured motor parameters first.

Then inspect the mechanical equipment for excessive resistance or loading.

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Problem 4 – Excessive Starting Current

Possible Causes

• Acceleration time too short
• Current limitation incorrectly configured
• Heavy mechanical load
• Incorrect motor parameters
• Motor condition

Diagnostic Procedure

Compare the configured motor information with the actual motor nameplate.

Inspect the mechanical load at the same time.

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Problem 5 – Soft Starter Trips During Startup

Possible Causes

• Motor overload
• Phase problem
• Wiring error
• Incorrect configuration
• Excessive mechanical load
• Mechanical obstruction

Avoid repeatedly resetting the starter without identifying the root cause.

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Problem 6 – ATS48C11Q Overheats

Possible Causes

• Insufficient ventilation
• Blocked airflow
• High cabinet temperature
• Excessive starting frequency
• Motor overload
• Cooling problem
• Dust contamination

Corrective Action

Inspect the cabinet’s complete thermal environment.

Make sure ventilation paths are clear and that nearby equipment is not creating excessive heat.

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Problem 7 – Motor Vibrates During Startup

Possible Causes

• Shaft misalignment
• Loose coupling
• Bearing deterioration
• Mechanical imbalance
• Incorrect acceleration profile
• Mechanical resonance

A motor vibration problem should be investigated from both electrical and mechanical perspectives.

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Problem 8 – Motor Stops Too Abruptly

Possible Causes

• Incorrect stopping configuration
• Incorrect deceleration parameters
• External stop command
• PLC logic problem
• High-inertia load

Review the entire stopping sequence.

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Problem 9 – Motor Does Not Stop

Possible Causes

• Stop signal missing
• Control wiring problem
• PLC logic issue
• External interlock
• Configuration problem

Trace the stop command from the automation system to the soft starter.

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Problem 10 – Modbus Communication Failure

Possible Causes

• Incorrect device address
• Incorrect communication speed
• Incorrect serial configuration
• Damaged RS-485 wiring
• PLC configuration problem
• Network termination problem
• Communication interface fault

Diagnostic Procedure

Check the physical communication wiring first.

Then verify:

• Device address
• Baud rate
• Communication parameters
• PLC configuration
• Network topology

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Problem 11 – Repeated Overload Faults

Possible Causes

• Excessive mechanical load
• Bearing problems
• Mechanical obstruction
• Incorrect motor parameters
• Excessive starting frequency
• Incorrect soft-starter settings
• Abnormal process conditions

Repeated overload faults normally indicate an underlying application or configuration problem.

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Fault Diagnosis Flow

A structured diagnostic process can follow this sequence:

Incoming Power

↓

Circuit Protection

↓

ATS48C11Q Status

↓

Control Signals

↓

Modbus Communication

↓

Power Connections

↓

Motor

↓

Mechanical Load

↓

Configuration

↓

Controlled Restart

This method helps separate electrical, control, communication, motor, configuration, and mechanical problems.

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Preventive Maintenance

Electrical Inspection

Regularly inspect:

• Power terminals
• Control terminals
• Grounding
• Cable insulation
• Signs of overheating
• Loose connections

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Cooling Inspection

Check:

• Cabinet ventilation
• Airflow
• Cooling path
• Filters
• Dust accumulation
• Ambient temperature

Keep the airflow path unobstructed.

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Mechanical Inspection

Inspect:

• Mounting hardware
• Cable supports
• Motor alignment
• Couplings
• Bearings
• Gearboxes
• Mechanical vibration

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Operational Monitoring

Monitor:

• Motor current
• Starting time
• Operating temperature
• Fault history
• Starting frequency
• Vibration
• Abnormal noise

Comparing current operating behavior with historical performance can help identify developing problems.

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Preventive Maintenance Table

Maintenance Item	Recommended Action
Power Terminals	Inspect for looseness and heating
Control Wiring	Check connection integrity
Grounding	Verify continuity
Modbus Wiring	Inspect RS-485 connections
Cooling System	Inspect and clean
Ventilation	Keep airflow unobstructed
Cabinet Filters	Clean or replace when required
Motor Current	Monitor operating values
Fault History	Review regularly
Mounting Hardware	Inspect periodically
Cable Insulation	Check for deterioration
Cabinet Interior	Remove dust and contamination
Mechanical Equipment	Inspect alignment and vibration

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Common Installation Errors

Incorrect Motor Data

Incorrect motor current, voltage, or frequency information can cause poor starting performance and unnecessary protection trips.

Insufficient Ventilation

Poor cabinet ventilation can increase internal temperature and shorten equipment life.

Loose Power Terminals

Loose connections can create localized heating and intermittent operation.

Incorrect Control Wiring

An incorrectly wired start or stop circuit can make a correctly functioning soft starter appear defective.

Incorrect Communication Settings

Communication failures can be caused by incorrect addressing, baud rate, wiring, or PLC configuration.

Poor Grounding

Improper grounding can create safety and electrical-performance problems.

Mechanical Overload

A motor may fail to accelerate correctly because of a mechanical problem rather than a soft-starter failure.

Repeated Fault Resets

Repeatedly resetting faults without identifying the cause can increase downtime and potentially worsen equipment problems.

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Industrial Automation Integration

The ATS48C11Q can function as part of a larger industrial motor-control architecture.

A typical arrangement is:

PLC / DCS / HMI

↓

Start / Stop / Interlock Commands

↓

ATS48C11Q

↓

Three-Phase Motor

↓

Pump / Fan / Compressor / Conveyor

↓

Process

The Modbus interface can be used to exchange selected control and monitoring information with an automation controller.

Typical information exchanged in an automation system may include:

• Start command
• Stop command
• Motor status
• Starter status
• Fault status
• Operating information
• Diagnostic information

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Supporting Components

A complete ATS48C11Q installation may contain:

• Circuit breaker
• Disconnect switch
• Fuses
• Contactors
• Motor protection devices
• PLC
• HMI
• Control relays
• RS-485 communication equipment
• Emergency-stop circuitry
• Current-monitoring equipment
• Motor sensors
• Process sensors

Component selection should be based on the actual motor, electrical supply, load characteristics, safety requirements, and control architecture.

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Related Altistart 48 Models

Model	Typical Application Position
ATS48D62Q	Medium-current motor applications
ATS48D75Q	Medium-current motor applications
ATS48D88Q	Higher-current motor applications
ATS48C11Q	Higher-current industrial motor applications
ATS48C14Q	Larger motor applications
ATS48C17Q	Larger motor applications
ATS48C21Q	Higher-power motor applications

The correct model should be selected according to actual motor current, motor voltage, starting duty, mechanical load, ambient conditions, and application requirements.

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Key Advantages

• Industrial Altistart 48 soft-starting solution
• Designed for three-phase asynchronous motors
• Controlled acceleration
• Controlled stopping
• Motor protection functions
• Starter protection functions
• Modbus communication
• RS-485 communication interface
• Suitable for PLC integration
• Suitable for pumps, fans, compressors, conveyors, and mixers
• Forced-air cooling
• Vertical installation
• Dimensions: 290 × 190 × 235 mm
• Weight: 8.3 kg

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Technical FAQs

What is the Schneider ATS48C11Q?

The ATS48C11Q is an Altistart 48 industrial soft starter designed for controlled starting and stopping of three-phase asynchronous motors.

What are the dimensions of the ATS48C11Q?

The specified dimensions are 290 × 190 × 235 mm.

What is the weight of the ATS48C11Q?

The specified weight is 8.3 kg.

What is the purpose of a soft starter?

A soft starter controls the motor-starting process to reduce sudden electrical and mechanical stress associated with direct motor starting.

What applications can use the ATS48C11Q?

Typical applications include pumps, fans, compressors, conveyors, blowers, mixers, and other industrial motor-driven equipment.

Does the ATS48C11Q support Modbus?

Yes. The ATS48C11Q provides a Modbus communication interface using an RS-485 serial network.

Why does the motor fail to start?

Possible causes include a missing start command, active interlock, incorrect configuration, motor wiring problems, motor faults, or mechanical obstruction.

Why does the soft starter overheat?

Possible causes include inadequate ventilation, blocked airflow, high cabinet temperature, excessive starting frequency, motor overload, or contamination.

Why does the ATS48C11Q trip during acceleration?

Possible causes include excessive load, incorrect motor parameters, phase-related problems, unsuitable starting settings, wiring problems, or mechanical resistance.

What should be checked before commissioning?

Check motor nameplate data, power wiring, control wiring, grounding, protective equipment, ventilation, communication settings, soft-starter parameters, and the mechanical load.

Can the ATS48C11Q be connected to a PLC?

Yes. Its Modbus communication capability allows it to be incorporated into suitable PLC and industrial automation architectures.

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Conclusion

The Schneider ATS48C11Q Soft Starter is an industrial motor-control device designed to provide controlled acceleration and stopping for three-phase asynchronous motors. It can be used in applications where reducing mechanical shock, improving starting behavior, and integrating motor control into an automation system are important.

The specified physical dimensions are 290 × 190 × 235 mm, and the weight is 8.3 kg. Proper cabinet planning should provide additional space around the unit for wiring, ventilation, inspection, and maintenance.

Successful installation depends on correct motor selection, appropriate parameter configuration, properly designed power and control circuits, adequate grounding, suitable ventilation, and careful commissioning.

For troubleshooting, technicians should follow a structured process beginning with the incoming power and circuit protection, then checking the ATS48C11Q status, control signals, communication, motor circuit, motor condition, configuration, and mechanical load.

Regular preventive maintenance of electrical connections, cooling conditions, communication wiring, motor performance, fault history, and mechanical equipment can help reduce unexpected downtime and maintain reliable operation of the ATS48C11Q in industrial automation systems.