ABB PST105-600-70 1SFA894009R7000 Soft Starter

Applications

The ABB PST105-600-70 Soft Starter is a high-performance motor starting and stopping solution designed for industrial three-phase asynchronous motors. As part of ABB's PST series, it combines controlled motor acceleration, current limitation and integrated motor protection functions to help reduce electrical and mechanical stress during startup.

With advanced motor control capabilities and flexible configuration options, the PST105-600-70 is suitable for industrial installations where reliable motor operation, reduced starting current and improved equipment protection are essential.

Typical applications include:

• Water and Wastewater Treatment: Controls pump acceleration and deceleration to help reduce pressure surges in pipeline systems.

• HVAC Systems: Supports smooth starting of industrial fans, ventilation equipment and large air-handling motors.

• Conveyor Systems: Reduces mechanical shock during motor startup, helping protect belts, gears and connected machinery.

• Industrial Compressors: Provides controlled acceleration for compressor motors and helps reduce electrical demand during startup.

• Mining and Material Handling: Supports reliable motor starting in demanding industrial production environments.

• Chemical and Process Industries: Provides controlled motor operation for pumps, mixers and other process equipment.

• Manufacturing Facilities: Helps improve motor starting performance across production machinery and automated equipment.

Advantages

1. Reduced Starting Current

The PST105-600-70 uses controlled voltage ramping and current limitation to reduce the high inrush current associated with direct-on-line motor starting. This helps minimize electrical disturbances and reduce stress on the power distribution network.

2. Smooth Motor Acceleration and Deceleration

Adjustable starting and stopping parameters allow the motor to accelerate and decelerate more gradually. This is particularly beneficial for pumping applications where sudden pressure changes can damage pipelines and mechanical components.

3. Integrated Motor Protection

The PST series incorporates electronic motor protection functions designed to help protect connected motors against abnormal operating conditions, including overload and phase-related faults.

4. Flexible Configuration

The control interface and parameter settings allow technicians to configure motor starting characteristics according to application requirements, making the unit suitable for different industrial operating conditions.

5. Improved Equipment Service Life

By reducing mechanical shock during startup and stopping, the soft starter helps limit unnecessary wear on motors, couplings, belts, pumps and other connected machinery.

6. Industrial Communication Capabilities

The PST platform supports fieldbus communication through compatible communication accessories, allowing integration into industrial automation and motor management systems.

7. Reduced Maintenance Requirements

Controlled motor starting can reduce mechanical stress on connected equipment, helping maintenance teams manage wear and improve the long-term reliability of industrial machinery.

8. Reliable Industrial Performance

The PST105-600-70 is designed for demanding motor control applications where consistent startup behavior, electrical protection and operational stability are important.

Technical FAQs

Q1: What is the main function of the ABB PST105-600-70 Soft Starter?

The PST105-600-70 controls the voltage supplied to a three-phase motor during startup and stopping. It reduces starting current and mechanical shock while providing integrated motor protection and monitoring functions.

Q2: What type of motors can the PST105-600-70 control?

It is designed for three-phase squirrel-cage asynchronous motors. Motor compatibility should be verified according to rated current, voltage, starting duty and the selected connection configuration.

Q3: How does the PST105-600-70 reduce motor starting current?

The soft starter gradually increases the voltage supplied to the motor during acceleration. By controlling the voltage ramp and current limit, it reduces the high inrush current associated with direct-on-line starting.

Q4: What is the difference between a soft starter and a variable frequency drive?

A soft starter primarily controls motor voltage during startup and stopping. A variable frequency drive controls both voltage and frequency, allowing continuous motor speed adjustment. The PST105-600-70 is intended for controlled starting and stopping rather than full-time variable-speed operation.

Q5: Does the PST105-600-70 support soft stopping?

Yes. The PST series supports controlled motor stopping through adjustable voltage reduction. This function is especially useful for pumps and other applications where sudden stopping can create hydraulic or mechanical disturbances.

Q6: What motor protection functions are available?

The PST series provides electronic motor protection features, including overload protection and phase-related monitoring. The specific protection configuration should be selected according to the motor characteristics and application requirements.

Q7: Can the PST105-600-70 communicate with a PLC?

Yes. The PST platform supports industrial fieldbus communication through compatible communication accessories. The required interface and protocol depend on the PLC network and the installed communication option.

Q8: What should be checked if the motor fails to start?

Check the incoming three-phase supply, control voltage, motor connections, protection settings and active fault indications. Also verify that the selected motor current parameters and starting configuration are appropriate for the connected motor.

Q9: Why does a soft starter trip during motor acceleration?

Possible causes include excessive starting current, incorrect motor rated-current settings, an unsuitable current limit, excessive mechanical load, phase loss or inadequate starting time. Review the fault indication and operating parameters before restarting the equipment.

Q10: What maintenance is recommended for the PST105-600-70?

Regular maintenance should include inspecting power and control terminals, checking electrical connections, cleaning ventilation paths, reviewing  fault history and verifying protection settings. Maintenance should be performed by qualified personnel with the equipment isolated from its power supply.