Product Overview

The Schneider ATS22C25S6U Soft Starter for Asynchronous Motor is an Altistart 22 motor-control unit used to manage the starting and stopping of asynchronous motors in industrial equipment.

In a conventional direct-start arrangement, a motor can draw a substantial starting current and transfer torque to the mechanical load very quickly. For equipment with belts, couplings, pumps, compressors, fans, or conveyors, that sudden transition may result in mechanical stress or an undesirable process response. The ATS22C25S6U is used to make the motor’s transition into operation more gradual.

A typical installation places the soft starter between the incoming power supply and the motor. It is suitable for applications where controlled starting and stopping are required, while continuous variable-speed operation is not the primary requirement.

Technical Specifications

Product Features

The ATS22C25S6U is intended for motor applications where the startup and stopping process needs to be managed rather than switched abruptly.

• Altistart 22 soft starter
• Suitable for asynchronous motor applications
• Controls motor acceleration during startup
• Supports controlled stopping
• Helps reduce sudden torque transmission to the mechanical load
• Suitable for industrial motor-control cabinets
• Applicable to pumps, fans, compressors, and conveyors
• Suitable for general machinery applications
• Dimensions of 425 × 206 × 299 mm
• Stated weight of 33 kg

Working Principle

The ATS22C25S6U is installed in the motor power circuit and controls the electrical conditions applied to the asynchronous motor during starting.

The basic arrangement can be represented as:

Incoming Power → ATS22C25S6U → Asynchronous Motor → Mechanical Load

Instead of allowing the motor to transition immediately into its normal operating condition, the soft starter manages the startup process so that acceleration occurs progressively.

This is useful when the mechanical load is sensitive to sudden torque. A conveyor, for example, may benefit from a more gradual belt acceleration, while a pump installation may require a controlled transition to avoid an abrupt change in the driven system.

When the application requires a controlled stop, the starter can also manage the motor’s transition toward a stopped state.

Unlike a variable-frequency drive, the ATS22C25S6U is primarily concerned with motor starting and stopping, not continuous speed regulation.

Industrial Applications

The ATS22C25S6U can be applied to industrial equipment driven by asynchronous motors where controlled starting is required.

The actual selection should consider the motor characteristics and the mechanical behavior of the connected load.

Compatible System Components

The ATS22C25S6U is normally integrated with several other components in a motor-control system.

When commissioning the system, the soft starter should be evaluated together with the motor, protection equipment, control circuit, and driven load.

Installation and Maintenance

The ATS22C25S6U is intended for installation in an appropriate electrical enclosure. Its stated 33 kg weight and physical dimensions should be considered when planning cabinet mounting and mechanical support.

Before installation or replacement, verify the complete model number and the requirements of the motor-control application.

Recommended checks include:

• Confirm the complete ATS22C25S6U model number.
• Verify motor and incoming supply requirements.
• Check power-terminal connections.
• Inspect motor cables and terminals.
• Verify control wiring.
• Check grounding arrangements.
• Confirm adequate cabinet ventilation.
• Inspect terminals for looseness or overheating.
• Review the starter configuration after replacement.
• Check the mechanical load if the motor accelerates abnormally.
• Inspect the motor if starting problems persist.
• Perform a controlled test run after installation.

If the motor fails to start or accelerate correctly, the investigation should include the electrical supply, motor, wiring, mechanical load, protection devices, and starter configuration.

Recommended Related Models

The following Altistart 22 models can be considered for related motor-control applications, with final selection based on the actual motor and system requirements.

A replacement should be selected using the complete model number and actual application requirements rather than physical dimensions alone.

Key Advantages

• Altistart 22 soft starter
• Intended for asynchronous motors
• Controlled motor acceleration
• Controlled stopping capability
• Suitable for industrial motor-control applications
• Applicable to pumps, fans, compressors, and conveyors
• Suitable for larger motor-control installations
• Dimensions of 425 × 206 × 299 mm
• Stated weight of 33 kg

Technical FAQs

What is the ATS22C25S6U used for in an industrial motor circuit?

It is used to manage the starting and stopping process of an asynchronous motor. The unit is appropriate when a controlled motor transition is preferred over direct starting.

What is the difference between ATS22C25S6U and a variable-frequency drive?

The ATS22C25S6U is a soft starter focused on starting and stopping. A variable-frequency drive can additionally regulate motor speed during normal operation by changing the electrical frequency supplied to the motor.

Why should the mechanical load be considered when selecting this soft starter?

The load determines the torque and acceleration behavior required during startup. Pumps, conveyors, compressors, and high-inertia machinery can place very different demands on the motor during acceleration.

What should be inspected if the motor does not accelerate normally?

Check the incoming supply, motor connections, control wiring, starter configuration, protection devices, and mechanical load. Excessive load or an electrical connection problem can produce starting symptoms that are not caused by the soft starter itself.