Product Overview

The ABB PST142-600-70 1SFA894010R7000 Soft Starter is an advanced electronic motor starting device designed to control the acceleration and deceleration of three-phase AC motors. As part of ABB’s PST soft starter family, it provides adjustable starting characteristics, motor protection functions, and control features for industrial applications where direct-on-line starting may create excessive electrical or mechanical stress.

When a large motor starts directly across the supply, it can draw a high inrush current and produce a sudden increase in mechanical torque. These effects may cause voltage disturbances, stress on couplings and belts, and unnecessary wear on connected equipment. A soft starter helps manage this process by controlling the voltage applied to the motor during startup.

The PST142-600-70 has a rated operational current of 142 A for in-line connection and supports a main circuit voltage range of 208–600 V AC. Its control supply voltage range is 100–250 V AC, with a rated frequency of 50/60 Hz. At 400 V, its published in-line motor power rating is 75 kW.

The unit belongs to ABB’s advanced PST range and provides configurable starting and stopping parameters, integrated electronic overload protection, and programmable control functions. It can be used in pumping systems, compressors, fans, conveyors, and other industrial motor-driven equipment when the motor and application requirements are within its rated operating limits.

The complete order code, 1SFA894010R7000, is important when identifying this product. Buyers should distinguish it from related PST142 variants, including coated versions and products from other ABB soft starter families. Similar model names do not necessarily indicate identical hardware or configuration.

Technical Specifications

Note: Motor power ratings depend on the connection method, supply voltage, operating conditions, and applicable duty requirements. Always use the manufacturer’s selection tables when sizing the soft starter.

Function and Working Principle

The ABB PST142-600-70 controls the voltage applied to an AC motor during starting and stopping. Unlike a direct-on-line starter, which applies the supply voltage immediately, a soft starter gradually changes the motor’s applied voltage according to configured parameters.

This controlled process helps reduce the electrical and mechanical impact associated with motor startup.

1. Controlled Motor Starting

When a start command is received, the PST142-600-70 begins applying voltage according to the configured initial voltage and ramp settings.

The initial voltage can be adjusted within the specified range of 30–70%. The starter then increases the motor voltage progressively to support a controlled acceleration process.

This function is useful for equipment where sudden acceleration may create mechanical stress or disrupt the production process.

2. Current Limitation

Motor starting current can be considerably higher than normal operating current. The PST soft starter provides an adjustable current-limit function that allows engineers to configure the starting-current behavior according to the motor and application.

Appropriate current settings can help reduce the impact of startup on the electrical distribution system. The selected limit must still provide sufficient starting torque to accelerate the connected load.

If the current limit is set too low, the motor may take too long to accelerate or may fail to reach its operating speed.

3. Soft Stopping

The PST142-600-70 supports controlled stopping through adjustable stopping parameters.

Instead of immediately disconnecting the motor, the soft starter can reduce the applied voltage over a configured period. This may help reduce abrupt mechanical changes in applications such as pumping systems and material-handling equipment.

The stopping method should be selected according to the load characteristics. A soft starter is not a variable frequency drive and does not provide continuous variable-speed operation.

4. Electronic Motor Overload Protection

The PST142-600-70 includes integrated electronic overload protection. This function monitors motor operating conditions and helps protect the motor against excessive thermal loading.

The motor’s rated current and protection parameters must be configured correctly. Incorrect settings may result in inadequate protection or unnecessary trips.

Electronic overload protection should be used together with an appropriately designed electrical protection system. It does not replace every form of short-circuit protection or the required upstream protective devices.

5. Programmable Control and Monitoring

The PST advanced range provides configurable control and monitoring functions for industrial motor applications. Depending on the selected settings and system architecture, operators and control equipment can use these functions to manage starting, stopping, and fault responses.

The specific terminal assignments, signal functions, and communication configuration should be confirmed against the exact product documentation before system integration.

Role in Industrial Automation Systems

The ABB PST142-600-70 can serve as the motor-starting component in an industrial automation system. It is typically installed between the electrical supply and the motor, with control signals provided by a PLC, relay logic, or another suitable control arrangement.

PLC-Based Motor Control

A PLC can coordinate the soft starter with sensors, process equipment, safety interlocks, and other motor-control devices.

For example, a PLC may issue a start command when a pump is required to operate and receive a fault signal if the soft starter detects an abnormal condition. This allows motor operation to be coordinated with the wider production sequence.

The control wiring and signal configuration must be checked against the starter’s terminal documentation.

HMI and Operator Interface

An HMI can provide operators with information about equipment status, alarms, and operating conditions. It may also be used to manage process commands through the PLC or an appropriate control interface.

The PST series supports operator-oriented configuration and monitoring features. The actual interface and available functions depend on the installed hardware and setup.

Motor Protection Coordination

The soft starter’s electronic overload function can form part of a wider motor-protection strategy. Circuit breakers, fuses, contactors, isolators, and other protective devices must be selected according to the motor, starter, installation, and applicable electrical standards.

A coordinated protection design helps prevent a fault in one part of the system from creating unnecessary damage elsewhere.

Industrial Applications

The ABB PST142-600-70 is designed for industrial three-phase motor applications requiring controlled starting and stopping. Its 142 A in-line rating makes it suitable for appropriately sized motors in medium- and larger-capacity equipment.

1. Industrial Pumping Systems

Pumps are widely used in water treatment, industrial processing, cooling systems, and fluid-transfer installations.

A soft starter can help reduce sudden torque changes during startup. Controlled stopping may also help reduce abrupt changes in fluid movement in suitable pumping applications.

The correct stopping method depends on the pump type, pipe layout, fluid characteristics, and system pressure. A soft starter does not automatically eliminate water hammer.

2. Industrial Compressors

Compressors often require substantial starting torque and may operate under changing load conditions. A soft starter can manage the initial motor acceleration and help reduce the electrical impact of starting.

Before selecting the PST142-600-70, engineers should check compressor starting requirements, unloading arrangements, motor current, and the permitted starting frequency.

3. Fans and Ventilation Equipment

Large ventilation fans and industrial blowers may experience significant mechanical inertia. Controlled starting can help reduce sudden stress on shafts, belts, bearings, and other mechanical components.

The starter should be selected according to the motor’s current rating, starting time, and load characteristics.

4. Conveyor Systems

Industrial conveyors often use motors that must accelerate heavy belts and transported materials. A soft starter can help reduce sudden mechanical loading during startup.

It is particularly useful where the process requires a controlled transition from a stopped condition to normal operating speed. For applications requiring continuous speed adjustment, a variable frequency drive may be more appropriate.

5. Industrial Processing Machinery

Mixers, material-handling equipment, and other motor-driven machines may benefit from controlled motor starting. The PST142-600-70 can help manage starting current and acceleration when correctly matched to the motor and machine.

The application must be evaluated for starting torque, inertia, duty cycle, and the number of starts per hour.

Installation and System Integration

Correct installation is essential for safe operation and reliable motor starting.

1. Verify the Electrical Supply

Confirm that the main circuit voltage is within the specified 208–600 V AC range. The control supply must also match the specified 100–250 V AC range.

Check the supply frequency, motor nameplate current, rated power, and connection method before installation.

Do not select a soft starter based only on the motor’s kilowatt rating. Current, starting time, load characteristics, ambient temperature, and starting frequency are also important.

2. Confirm Mounting and Cabinet Space

The supplied dimensions are 390 × 186 × 270 mm, with a weight of 13 kg.

Allow adequate cabinet space for mounting, wiring, ventilation, and maintenance access. The soft starter generates heat during operation, so the enclosure must provide suitable thermal management.

The main terminals have specific protection and installation requirements. Do not assume that the starter’s internal components and terminals provide complete protection against accidental contact.

3. Connect Main Circuit Wiring

Connect the incoming supply and motor conductors according to the manufacturer’s wiring diagram.

Cable size, terminal selection, tightening torque, protective devices, and grounding must be determined according to the installation requirements and applicable electrical codes.

All wiring work should be carried out by qualified personnel after the equipment has been isolated and verified safe.

4. Connect Control Wiring

Connect the start, stop, reset, and monitoring signals according to the control-system design.

If the starter is controlled by a PLC, confirm the electrical characteristics of the PLC outputs and the starter’s control inputs. Check signal references and interlocking requirements before energizing the system.

5. Configure Motor Parameters

Enter the motor’s rated current and configure the relevant starting and stopping parameters.

The initial voltage, acceleration ramp, current limit, overload protection, and stopping behavior should be selected according to the motor and driven equipment.

Incorrect settings may cause excessive starting current, insufficient starting torque, long acceleration periods, or unwanted protection trips.

6. Commission the Installation

Before normal operation, verify the power connections, control wiring, grounding, and protective-device arrangement.

Perform a controlled test start and observe motor acceleration, current behavior, and mechanical response. Check stop commands, fault signals, overload settings, and PLC interlocks.

Record the final parameter settings for future maintenance and replacement work.

Compatible System Components

The PST142-600-70 is normally installed as part of a complete motor-control system.

These components are examples of equipment used in a complete installation. They are not necessarily included with the PST142-600-70.

Alternative Models and Replacement Considerations

When replacing the PST142-600-70, engineers should compare electrical ratings, connection methods, control functions, and physical installation requirements.

A replacement should not be selected solely because it has a similar current rating. Verify:

• Main circuit voltage.
• Rated operational current.
• Motor power at the actual supply voltage.
• In-line or inside-delta connection.
• Control supply voltage.
• Starting and stopping requirements.
• Overload protection settings.
• Control terminals and PLC interface.
• Communication and monitoring functions.
• Physical dimensions and mounting arrangement.
• Required short-circuit protection and accessories.

For an existing installation, retaining the same catalog number may simplify replacement, but the condition and revision of the unit should still be checked.

Key Advantages

Controlled Motor Starting

The PST142-600-70 gradually increases motor voltage during startup, helping reduce the abrupt electrical and mechanical effects of direct-on-line starting.

Adjustable Starting Parameters

Configurable initial voltage, ramp time, and current-limit settings allow engineers to adapt motor starting behavior to the application.

Controlled Stopping

Adjustable stopping parameters support controlled motor deceleration in applications where an abrupt stop may affect the process or connected machinery.

Integrated Electronic Overload Protection

The built-in overload function helps protect the motor against excessive thermal loading when correctly configured.

Wide Main Circuit Voltage Range

The 208–600 V AC operating range supports a variety of industrial three-phase electrical systems.

Industrial Control Integration

The PST advanced range provides control and monitoring functions that can be incorporated into suitable PLC-based motor-control systems.

Established ABB Soft Starter Platform

The PST family has been used in industrial installations for motor starting and protection. Its product documentation and related models can assist maintenance teams with equipment identification and replacement planning.

Technical FAQs

1. What is the ABB PST142-600-70?

The ABB PST142-600-70 is an advanced electronic soft starter designed to control the starting and stopping of three-phase AC motors. Its rated operational current is 142 A for in-line connection.

2. What is the order number of this model?

The order number is 1SFA894010R7000. This complete number should be checked when purchasing or replacing the device.

3. What is its main circuit voltage range?

The rated operational voltage range is 208–600 V AC. The actual supply must be within the permitted range and compatible with the motor installation.

4. What control supply voltage does it require?

The rated control supply voltage is 100–250 V AC at 50/60 Hz.

5. What motor power can it support?

For in-line connection, the published motor power rating is 75 kW at 400 V and 90 kW at 500 V. Inside-delta ratings are different and must be assessed using the manufacturer’s selection information.

6. Does the PST142-600-70 provide motor overload protection?

Yes. It includes integrated electronic overload protection. The motor’s rated current and relevant protection settings must be configured correctly.

7. Can it be controlled by a PLC?

Yes. It can be incorporated into a PLC-based control system using compatible control signals and the appropriate wiring arrangement. Confirm the available terminals and signal characteristics before integration.

8. Is this soft starter suitable for variable-speed operation?

No. A soft starter controls motor acceleration and deceleration. It does not provide continuous variable-speed operation like a variable frequency drive.

9. What is the weight of the PST142-600-70?

The product weight is approximately 13 kg, consistent with the supplied listing information.

10. What should be checked before replacing this soft starter?

Verify the complete order number, main circuit voltage, rated current, motor power, connection method, control supply, wiring, protection settings, and mounting dimensions. Also check whether the replacement requires changes to the PLC program or control cabinet.

Procurement and Maintenance Recommendations

When sourcing the ABB PST142-600-70, verify both the model designation and the complete order number 1SFA894010R7000. This helps distinguish the standard version from related PST variants and other soft starter models with similar current ratings.

For new, surplus, or refurbished units, request clear photographs of the product label, terminals, and enclosure. Confirm the product’s physical condition, storage history where available, and whether it has been functionally tested. Check the supply package for any accessories required by the installation.

During routine maintenance, inspect power and control terminals, cable insulation, grounding, cabinet ventilation, and signs of overheating. Review fault records and motor protection settings as part of the maintenance schedule.

The soft starter should be selected and configured according to the motor’s actual operating conditions. Frequent starts, long acceleration periods, high ambient temperatures, and heavy loads can affect thermal performance. These conditions should be considered when planning the duty cycle and maintenance intervals.

For replacement projects, compare the original starter’s control wiring and parameter settings with the proposed replacement. Even when the current rating is similar, differences in control functions, terminals, protection behavior, and mounting dimensions may require changes to the installation.

Conclusion

The ABB PST142-600-70 1SFA894010R7000 Soft Starter is an advanced motor starting device with a 142 A in-line rated operational current and a main circuit voltage range of 208–600 V AC. It provides adjustable starting and stopping characteristics, current limitation, and integrated electronic overload protection for compatible three-phase industrial motors.

With a 75 kW in-line rating at 400 V and a 13 kg product weight, it is suitable for appropriately sized industrial motor applications, including pumps, compressors, fans, conveyors, and processing machinery.

For maintenance and replacement projects, confirming the complete order number, electrical ratings, connection method, and control requirements is essential to ensure correct system integration and reliable operation.