Product Overview

The Schneider ATS22D17S6U is an Altistart 22 soft starter designed for controlled starting and stopping of three-phase asynchronous motors. With a 17 A starter rating and a 110 V AC control circuit, it is intended for industrial motor applications where smoother acceleration, reduced starting stress, and reliable motor control are required.

Direct-on-line motor starting can produce a high inrush current and a sudden increase in mechanical torque. Depending on the motor size and connected load, this can place additional stress on electrical distribution systems as well as shafts, couplings, gearboxes, belts, pumps, fans, and other mechanical components.

The ATS22D17S6U provides a controlled motor-starting process that allows the motor to accelerate progressively. Rather than applying the complete starting impact immediately, the soft starter manages the starting torque and limits the starting current according to the configured application parameters.

The ATS22D17S6U belongs to Schneider Electric’s Altistart 22 product family. It is designed for three-phase asynchronous motors and is particularly suitable for applications such as pumps, fans, compressors, material-handling equipment, and other industrial machines.

The model supports a three-phase supply in the approximately 208…600 V AC range and has an IcL starter rating of 17 A when connected in the motor supply line for standard applications. Its control circuit uses 110 V AC, which is an important identification characteristic when selecting the correct model for installation or replacement.

The supplied physical dimensions are approximately 265 × 130 × 169 mm, with a supplied weight of approximately 7 kg. These dimensions should be considered when designing an electrical cabinet, selecting mounting hardware, routing cables, and providing sufficient maintenance clearance.

Technical Specifications

What Is the Schneider ATS22D17S6U?

The Schneider ATS22D17S6U is a 17 A Altistart 22 soft starter used to manage the acceleration and stopping of compatible three-phase asynchronous motors.

A soft starter is installed between the electrical supply and the motor to control the motor’s starting behavior. Unlike direct-on-line starting, where the motor is immediately exposed to the full line voltage and can draw a high starting current, the ATS22D17S6U provides a controlled starting sequence.

The purpose is not simply to reduce electrical current. Controlled acceleration can also reduce mechanical shock within the driven machine. This can be particularly important for pumps, fans, compressors, conveyors, and other machines where sudden acceleration can affect mechanical components or process stability.

The ATS22D17S6U is also different from a variable frequency drive. A VFD is normally used when continuous motor-speed adjustment is required. The ATS22D17S6U is primarily intended for controlled starting and stopping while allowing the motor to operate normally at line frequency during its running condition.

For fixed-speed applications where the primary requirement is smoother starting rather than continuous speed regulation, a soft starter can be an efficient and practical solution.

Function and Working Principle

The basic motor-control arrangement can be represented as:

Three-Phase AC Supply → Protection Equipment → ATS22D17S6U → Three-Phase Motor → Mechanical Load

When a start command is received, the ATS22D17S6U begins its configured acceleration sequence. The soft starter controls the starting conditions applied to the motor so that acceleration occurs progressively.

The Altistart 22 uses torque-controlled starting with current limitation. The starting current can be limited to approximately 3.5 times the configured motor current, depending on the selected settings and application conditions.

This controlled starting process can reduce the sudden electrical demand associated with direct-on-line starting. It can also reduce the abrupt torque transfer to mechanical components.

As the motor accelerates, the starter moves the motor toward its normal running condition. The exact acceleration time depends on the motor, load inertia, required starting torque, current limitation, configured parameters, and operating environment.

After the motor reaches normal operation, the integrated bypass function can establish the normal operating path. This helps reduce heat dissipation and power losses in the starting stage during continuous running.

The ATS22D17S6U can also provide controlled stopping. This can be useful in applications where an abrupt stop may cause mechanical shock or undesirable process conditions.

For example, a pump may benefit from a controlled stopping process because sudden changes in motor operation can affect the hydraulic system. Similarly, a conveyor can benefit from controlled stopping when the transported material or mechanical drive system requires a smoother deceleration.

ATS22D17S6U Control Voltage and Model Identification

One of the most important characteristics of the ATS22D17S6U is its 110 V AC control circuit.

The model designation should be checked carefully when selecting a replacement because other ATS22 products with similar current ratings may use different control voltages.

For example, the ATS22D17S6U belongs to the 17 A class but is specifically designed around a 110 V AC control supply. This makes the complete part number important during maintenance and spare-parts procurement.

When replacing an existing unit, engineers should compare the original model number, motor current, motor supply voltage, control voltage, input and output wiring, communication requirements, mounting dimensions, and application duty.

Role in Industrial Control Systems

The ATS22D17S6U can function as the motor-starting component within a larger industrial automation architecture. It can work alongside PLC controllers, HMIs, circuit breakers, motor protection equipment, contactors, process sensors, and industrial communication networks.

A typical system may contain:

• PLC controller
• HMI operator interface
• ATS22D17S6U soft starter
• Three-phase asynchronous motor
• Incoming circuit breaker
• Motor protection device
• Contactor or isolation device
• Emergency stop circuit
• Pressure sensors
• Flow sensors
• Temperature sensors
• Modbus RS485 communication network
• 110 V AC control power supply

The PLC can manage the overall process sequence while the ATS22D17S6U controls the motor acceleration and stopping characteristics.

For example, in an automated pumping system, the PLC may monitor pressure or tank level. When a pump needs to start, the PLC sends the appropriate control command to the soft starter. The ATS22D17S6U then manages the motor acceleration while the control system continues monitoring process conditions.

This division of responsibilities makes the system easier to understand and maintain. The PLC focuses on machine logic and process control, while the soft starter focuses on the electrical starting behavior of the motor.

Industrial Applications

Pump Systems

Pumps are common applications for the ATS22D17S6U. Controlled acceleration can help reduce sudden motor current and mechanical impact during startup.

Suitable applications can include water circulation pumps, industrial process pumps, cooling-water systems, utility pumps, and other fixed-speed pumping equipment.

Fans and Blowers

Fans and blowers can have significant rotating inertia. Direct-on-line starting may create a sudden torque demand on the motor shaft and mechanical transmission.

The ATS22D17S6U can provide progressive acceleration for compatible fan and blower applications where continuous speed control is not required.

Compressors

Screw compressors and other compatible compressor systems can require controlled motor starting. A soft starter can help manage the initial electrical and mechanical demand when the motor and compressor are properly matched to the starter.

Material Handling Equipment

Material-handling systems can contain conveyors, rollers, gearboxes, and belts. Controlled acceleration can reduce sudden torque transfer and provide smoother movement during startup.

Conveyors

Conveyor systems may benefit from progressive acceleration because sudden motor torque can create unnecessary stress on belts, couplings, gearboxes, and transported materials.

Industrial Machinery

Other potential applications include mixers, ventilation equipment, process machinery, and utility systems using compatible fixed-speed asynchronous motors.

Installation and System Integration

Proper installation is essential for reliable operation of the ATS22D17S6U. The motor, electrical supply, protection system, cabinet environment, control circuit, and communication network should all be evaluated before commissioning.

Verify Motor Nameplate Data

The motor nameplate should be checked for rated voltage, rated current, frequency, power, connection type, and application duty.

The ATS22D17S6U should be selected according to the motor’s actual current and starting requirements. Motor horsepower alone should not be used as the only selection criterion.

Verify Supply Voltage

The ATS22D17S6U supports three-phase supply applications in the approximately 208…600 V AC range, with supply voltage limits of approximately 177…660 V.

The actual site voltage should be measured and verified before energizing the system.

Verify the 110 V Control Supply

The control circuit of the ATS22D17S6U requires approximately 110 V AC at 50/60 Hz.

This should be checked carefully during commissioning because the control voltage is an important distinction between different ATS22 model variants.

Install Suitable Protection

The complete installation should include appropriate short-circuit protection, isolation, grounding, and motor protection.

Protection equipment should be selected according to the motor, soft starter, electrical distribution system, installation environment, and applicable engineering requirements.

Mechanical Mounting

The supplied dimensions of the ATS22D17S6U are approximately 265 × 130 × 169 mm, and the supplied weight is approximately 7 kg.

The cabinet or mounting structure should be capable of safely supporting the equipment. Adequate clearance should also be provided for power cables, control cables, ventilation, inspection, and maintenance.

Cooling and Ventilation

The ATS22D17S6U uses forced-convection cooling. Cabinet airflow should therefore be considered during system design.

Other heat-generating devices installed near the soft starter should be included in the cabinet thermal calculation. Excessive ambient temperature can affect equipment performance and may require application-specific derating.

Power Wiring

The incoming three-phase supply and motor output cables should be correctly sized according to the motor current, installation method, cable length, ambient conditions, and applicable electrical requirements.

Before energizing the system, verify phase connections, grounding, cable terminations, insulation condition, and terminal tightness.

Control Wiring

The ATS22D17S6U provides three logic inputs and two relay outputs. These interfaces can be integrated into the machine control system for start commands, operating status, alarm indication, and fault monitoring.

Control wiring should be routed appropriately and kept separated from high-current motor cables where necessary to reduce electrical interference.

Modbus Communication

The ATS22D17S6U provides a Modbus communication interface using RS485 multidrop communication and an RJ45 connector.

The communication address, transmission rate, and other network parameters should be configured consistently with the PLC or other Modbus master device.

Commissioning

Commissioning should include verification of incoming voltage, 110 V control power, motor wiring, motor rotation, acceleration behavior, motor current, stopping characteristics, alarm status, and communication functions.

The first startup should be performed under controlled conditions. After the motor and load have been verified, the system can be returned to normal production operation.

Compatible System Components

Recommended Alternative Models

When selecting an alternative to the ATS22D17S6U, the motor current, motor voltage, control voltage, starting duty, load characteristics, cabinet dimensions, cooling requirements, and communication configuration should all be compared.

The control voltage is particularly important. The ATS22D17S6U uses 110 V AC control, while some other ATS22 variants use different control configurations. A similar current rating does not automatically mean that two models are direct electrical replacements.

Key Advantages

• Part of the Schneider Altistart 22 soft starter family
• 17 A starter rating
• Designed for three-phase asynchronous motors
• 208…600 V AC rated supply range
• 110 V AC control circuit
• Torque-controlled starting
• Starting current limitation to approximately 3.5 × In
• Internal bypass function
• Modbus communication capability
• RS485 multidrop communication
• RJ45 communication connection
• Three logic inputs
• Two relay outputs
• 750 Ω PTC probe input
• IP20 protection rating
• Forced-convection cooling
• Suitable for PLC-based motor-control systems
• Suitable for pumps and fans
• Suitable for compressors and conveyors
• Suitable for material-handling equipment
• Compact cabinet-mounted design
• Dimensions of approximately 265 × 130 × 169 mm
• Weight of approximately 7 kg

Technical FAQs

What is the Schneider ATS22D17S6U?

The Schneider ATS22D17S6U is a 17 A Altistart 22 soft starter designed to control the starting and stopping of compatible three-phase asynchronous motors.

What is the main function of the ATS22D17S6U?

Its main function is to provide controlled motor acceleration and stopping, helping reduce the electrical and mechanical impact associated with direct-on-line motor starting.

What is the current rating of the ATS22D17S6U?

The ATS22D17S6U has an IcL starter rating of 17 A for standard connection in the motor supply line.

What is the control voltage of the ATS22D17S6U?

The ATS22D17S6U uses a 110 V AC control circuit at 50/60 Hz.

What supply voltage does the ATS22D17S6U support?

The model is designed for three-phase AC supply applications in the approximately 208…600 V range, with supply voltage limits of approximately 177…660 V.

What motor power range is associated with the ATS22D17S6U?

Typical motor power references include approximately 3 hp at 208 V, 5 hp at 230 V, 10 hp at 460 V, and 15 hp at 575 V. Actual selection should always be based on the motor nameplate current and application duty.

What is the difference between ATS22D17S6U and ATS22D17S6?

The key identification difference is the control circuit configuration. The ATS22D17S6U uses 110 V AC control, while the ATS22D17S6 uses a different control configuration. The complete model number should therefore be verified before replacement.

Does the ATS22D17S6U have an internal bypass?

Yes. The ATS22D17S6U includes an internal bypass function that can reduce heat dissipation during normal motor operation after starting.

Does the ATS22D17S6U support Modbus?

Yes. The ATS22D17S6U supports Modbus communication through an RS485 multidrop interface with an RJ45 connection.

Can the ATS22D17S6U be connected to a PLC?

Yes. The soft starter can be integrated into PLC-based industrial control systems through its logic inputs, relay outputs, and Modbus communication interface.

What are the typical applications of the ATS22D17S6U?

Typical applications include centrifugal and piston pumps, fans, screw compressors, conveyors, material-handling equipment, and other compatible industrial machines.

Is the ATS22D17S6U a variable frequency drive?

No. The ATS22D17S6U is a soft starter. It is primarily designed to control motor acceleration and stopping rather than provide continuous variable-speed operation.

What are the dimensions of the ATS22D17S6U?

The supplied dimensions are approximately 265 × 130 × 169 mm.

How much does the ATS22D17S6U weigh?

The supplied product weight is approximately 7 kg.

What cooling method does the ATS22D17S6U use?

The ATS22D17S6U uses forced convection cooling. Appropriate cabinet ventilation and thermal management should therefore be considered during installation.

What should be checked before replacing an ATS22D17S6U?

The motor rated current, supply voltage, control voltage, starting duty, load characteristics, protection arrangement, cabinet dimensions, cooling conditions, control wiring, communication configuration, and mounting requirements should all be checked before selecting a replacement.

Conclusion

The Schneider ATS22D17S6U Soft Starter is a 17 A Altistart 22 motor-control device designed for controlled starting and stopping of compatible three-phase asynchronous motors. It is particularly useful for applications where direct-on-line starting could create excessive electrical current, sudden mechanical torque, or undesirable process effects.

With a rated supply range of approximately 208…600 V AC and a 110 V AC control circuit, the ATS22D17S6U can be incorporated into a variety of industrial motor-control systems. Its torque-controlled starting method and current limitation provide a smoother transition from motor standstill to normal operation.

The integrated bypass, Modbus RS485 communication, three logic inputs, two relay outputs, and PTC probe input allow the ATS22D17S6U to operate as part of a broader automation architecture. PLCs, HMIs, circuit breakers, motor protection devices, contactors, and process sensors can all be incorporated into the overall control system.

The ATS22D17S6U is especially relevant to pump, fan, compressor, conveyor, material-handling, and other fixed-speed motor applications. The correct application should always be confirmed using the motor’s actual nameplate current, voltage, starting duty, mechanical load, and operating environment.

The supplied dimensions of approximately 265 × 130 × 169 mm and weight of approximately 7 kg should be included when planning cabinet space and mounting arrangements. Because the unit uses forced-convection cooling, adequate ventilation and thermal management are also important.

For industrial automation engineers, machine builders, OEMs, system integrators, and maintenance teams, the Schneider ATS22D17S6U provides a practical solution for improving the starting and stopping characteristics of compatible motors. When correctly selected, installed, configured, and commissioned, it can provide reliable motor control while reducing the impact of starting on both the electrical system and connected mechanical equipment.