ABB PSTX570-600-70 for Controlled Acceleration and Safer Operation

Starting large three-phase motors across the line creates significant mechanical and electrical stress on both the motor and the connected power distribution system. The ABB PSTX570-600-70 Soft Starter addresses these challenges through intelligent microprocessor-controlled motor starting, providing smooth acceleration and deceleration while minimizing the inrush current and mechanical shock associated with direct-on-line starting. This advanced soft starter represents ABB's PSTX series, offering best-in-class motor control for medium to large industrial applications.

Aeliya Marine Tech is your reliable source for this ABB PSTX570 soft starter. As specialists in industrial automation equipment, we provide genuine ABB motor control products along with the technical expertise to ensure successful application.

PSTX Series: The Evolution of Soft Starting Technology

The PSTX series represents ABB's most advanced soft starter platform, building on decades of experience in motor control and protection. Unlike conventional soft starters that simply ramp voltage during start, the PSTX570 employs sophisticated algorithms to control motor torque, pump flow, and mechanical stress. The built-in bypass contactor reduces power losses during running, while the detachable graphic display provides intuitive setup and monitoring.

The PSTX570-600-70 designation provides complete ordering information: the PSTX platform, 570A maximum operational current, 600V maximum operational voltage, and 70 suffix indicating 100-250V AC control voltage. The catalog number 1SFA898117R7000 uniquely identifies this specific configuration within ABB's global ordering system.

Comprehensive Technical Specifications

Power Circuit Ratings

The PSTX570-600-70 handles a rated operational current of 570A in inline connection, with an operating voltage range from 208 to 600V AC. For inside-delta connections, the rated operational current increases to 987A, providing even greater motor starting capacity. The rated operational power at 400V is 315 kW in inline connection and 540 kW in inside-delta connection, making this soft starter suitable for some of the largest motors found in industrial applications.

Control and Interface Specifications

The control supply voltage spans 100-250V AC at 50/60Hz, accommodating global power standards without external transformers. The rated control circuit voltage is 24V DC, compatible with standard PLC outputs and control relays. The detachable full graphic display carries an IP66 rating with 4X outdoor certification, allowing panel door mounting for convenient access without opening the enclosure.

Advanced Control Functions

The PSTX570 offers an extensive suite of control functions beyond basic soft starting. Torque control starting provides smooth, controlled acceleration that is particularly beneficial for high-inertia loads. Kickstart delivers a short burst of high torque to overcome static friction. Current limit prevents excessive inrush current that could disrupt other equipment on the same power system. The pump cleaning function periodically reverses pump rotation to clear impeller blockages, while the jog function enables precise mechanical positioning.

Communication and Connectivity

Built-in Modbus RTU communication provides seamless integration with industrial control systems without requiring additional communication modules. Optional ANYBUS fieldbus modules extend connectivity to Profinet, Profibus, Modbus TCP, EtherNet/IP, and other industrial protocols. Three programmable digital inputs plus standard Start/Stop/Reset inputs provide flexible control options, while relay outputs deliver RUN, TOR, and Event status signals.

Motor Protection Features

The PSTX570 incorporates comprehensive motor protection functions that eliminate the need for a separate overload relay. Built-in electronic overload protection tracks motor heating using thermal modeling, providing accurate protection across the full speed range including during starting. Additional protection functions include undercurrent detection (useful for pump dry-running protection), phase sequence monitoring, phase imbalance detection, and PT100 temperature input for direct motor winding temperature monitoring.

The end-of-line (EOL) protection function is particularly valuable for submersible pump applications, detecting when the pump is operating with reduced or no flow. The stand-still brake function applies DC braking current to quickly stop the motor when rapid deceleration is required. These integrated protection features maximize motor life while reducing the complexity and cost of the overall control system.

Energy Efficiency and Operational Cost Savings

The PSTX570 delivers tangible energy savings compared to traditional starting methods. By limiting inrush current during starting, the soft starter reduces demand charges that can significantly impact electricity bills for facilities with large motors. The built-in bypass contactor eliminates thyristor conduction losses during running, ensuring that energy efficiency is maintained throughout the motor's operational cycle.

Reduced mechanical stress during starting translates directly into extended equipment life and lower maintenance costs. Couplings last longer when not subjected to sudden torque spikes. Gearboxes experience less wear when loads accelerate smoothly. Belts on fan and pump applications slip less and require less frequent adjustment or replacement. Over the operational life of the motor and driven equipment, these savings often exceed the initial investment in the soft starter many times over.

Applications Across Industries

The PSTX570 serves a diverse range of industrial applications where smooth, controlled motor starting is essential. Centrifugal pumps benefit from the pump control algorithms that eliminate water hammer and reduce pressure surges in piping systems. Fans and blowers start smoothly without belt squeal or mechanical shock to bearings and couplings. Compressors start under reduced load, extending mechanical life and reducing peak power demand.

Conveyor systems start smoothly without belt slip or material spillage. Crushers and mills start under controlled torque to prevent mechanical overload during the initial breaking of material. In marine applications, the soft starter controls seawater pumps, ballast pumps, and ventilation fans. HVAC systems benefit from reduced mechanical and electrical stress on large chiller and air handling unit motors.

Installation and Setup

The PSTX570 features main circuit terminal bars with a tightening torque of 35 Nm, suitable for cable or busbar connections. The connecting capacity for control circuits accepts rigid conductors up to 2.5 mm squared. The main terminals carry an IP00 rating, requiring installation within a suitable enclosure that provides appropriate ingress protection for the application environment.

Setup is streamlined through the graphic display and intuitive menu structure. Application macros for common loads such as pumps, fans, and compressors automatically configure the optimal parameter set. Fine-tuning of start and stop ramps, current limits, and protection thresholds can be performed through the display or via the communication interface.

Frequently Asked Questions

What motor size can the PSTX570-600-70 start?

The PSTX570 handles 315 kW at 400V in inline connection and 540 kW at 400V in inside-delta connection, with a rated operational current of 570A inline or 987A inside-delta.

What is the difference between inline and inside-delta connections?

Inline connection places the soft starter in series with the motor supply cables. Inside-delta connection places the soft starter in the motor delta winding, reducing the current through the starter by a factor of 1.73, allowing a smaller starter to control a larger motor.

Does the PSTX570 include a built-in bypass?

Yes, the PSTX570 includes a built-in bypass contactor that automatically closes after the motor reaches full speed, eliminating thyristor power losses during continuous operation.

What communication protocols are supported?

The PSTX570 includes built-in Modbus RTU. Optional ANYBUS modules extend support to Profinet, Profibus, Modbus TCP, EtherNet/IP, EtherCAT, DeviceNet, CANopen, BACnet-IP, and BACnet-MSTP.

What protection functions are integrated?

The PSTX570 includes electronic motor overload protection, undercurrent detection, phase sequence monitoring, phase imbalance detection, PT100 temperature input, end-of-line protection, and pump cleaning function.