Product Overview

The ABB 1SFB536171A1105 is a PSTX Softstarter Power Supply Board used within ABB PSTX softstarter assemblies. It belongs to the internal power-supply circuitry that supports the electronic control section and associated low-voltage functions required for softstarter operation.

Within a PSTX system, the power supply board works with the incoming control power and distributes the required supply to the relevant electronic circuits. Stable internal power is necessary for the control electronics, monitoring functions, communication interfaces, and other board-level functions to operate correctly.

The board is relevant to industrial motor-control applications using PSTX softstarters, including pump systems, fans, compressors, conveyors, and process machinery. Its function is associated with the internal electrical supply of the softstarter rather than directly switching the motor power circuit.

For maintenance engineers, a power-supply board fault can produce symptoms across several parts of the PSTX system. Troubleshooting should therefore include the incoming supply, internal connections, control board, protection circuitry, and other power-supply components before identifying the board itself as the source of a fault.

Technical Specifications

Product Features

• PSTX series internal power supply board
• Supports power distribution for the softstarter’s electronic circuitry
• Supplies associated control and monitoring functions
• Works with the PSTX control architecture
• Suitable for industrial motor-control assemblies
• Supports internal electrical operation of compatible PSTX softstarters
• Applicable to service and replacement of PSTX power-supply components

Working Principle

The 1SFB536171A1105 operates within the internal power-supply section of the PSTX softstarter. Incoming electrical power is processed by the power-supply circuitry and made available to the electronic circuits that require internal operating power.

The board supports the supply requirements of the PSTX control electronics and associated functions. Once the required internal supply conditions are established, the control system can initialize and perform functions such as command processing, monitoring, diagnostics, and communication.

Incoming Control Power → 1SFB536171A1105 Power Supply Board → Internal Electronic Circuits → PSTX Control System

A problem with the internal power supply can prevent the control electronics from initializing correctly or cause unstable operation. For this reason, power-supply troubleshooting should include input voltage, connections, protection components, and downstream electronic loads.

Role in an ABB PSTX Softstarter Control Architecture

The 1SFB536171A1105 belongs to the internal power-supply layer of the PSTX softstarter. It supports the electronic circuitry that processes motor-control commands and coordinates operation of the PSTX power section.

Incoming Supply → PSTX Power Supply Board → Control Electronics → Power-Control Section → Motor

The power supply board therefore supports the electronic control path that ultimately coordinates the motor-starting process.

Industrial Applications

Installation and Maintenance

1. Confirm that the 1SFB536171A1105 is the correct power-supply board for the installed PSTX assembly.
2. Isolate the softstarter from all hazardous electrical energy before accessing internal components.
3. Verify that the required discharge and electrical safety procedures have been completed.
4. Document existing board connections before removing the original power-supply board.
5. Use appropriate ESD precautions when handling the replacement electronic board.
6. Inspect connectors, terminals, and board interfaces for contamination or physical damage.
7. Check the incoming supply path and associated protection components before installing the replacement.
8. Install the board in the correct position and ensure all connectors are fully seated.
9. Verify internal wiring against the approved PSTX electrical documentation.
10. Restore power and check whether the PSTX control electronics initialize normally.
11. Check status indications, alarms, communication functions, and control responses after installation.
12. Perform a controlled motor-start and stopping test before returning the softstarter to normal service.

Compatible System Components

Recommended Related Models

Key Advantages

• Supports the internal electronic power requirements of PSTX softstarters.
• Provides the supply path required by associated control circuitry.
• Helps maintain stable operation of PSTX electronic functions.
• Useful for troubleshooting power-related softstarter faults.
• Suitable for replacement of compatible PSTX internal power-supply components.
• Works as part of the complete PSTX control and power architecture.

Technical FAQs

What function does the 1SFB536171A1105 perform in a PSTX softstarter?

It functions as an internal power-supply board, supporting the electrical supply required by the PSTX electronic control and associated internal circuitry.

What symptoms may indicate a problem with the power supply board?

Possible symptoms include failure of the PSTX control system to initialize, unexpected resets, missing electronic functions, abnormal diagnostic indications, or unstable operation. The incoming supply and related connections should also be checked.

Should the incoming supply be checked before replacing this board?

Yes. An incorrect or unstable incoming supply, damaged wiring, or a problem in the upstream protection circuit can produce symptoms similar to an internal power-supply fault.

What should be verified after replacing the power supply board?

Check all connections first, then verify normal PSTX initialization, status indications, alarms, communication, and control functions. A controlled motor-start and stopping test should be completed before returning the softstarter to service.