ABB 3ASC25H203 Main Control Board

Description

Hardware and Performance Specifications Auxiliary supply: 24 V DC, 18‑30 V DC wide‑range input Power consumption: ≤12 W Binary I/O: Galvanic‑isolated digital inputs, relay outputs for interlock, alarm and status feedback Communication interfaces: Internal rack back‑plane bus; RS485 field‑bus interface supporting Modbus‑RTU protocol Mounting mode: Subrack plug‑in control board for ASTAT soft‑starter cabinet Protection class: IP20 Operating temperature: ‑25 ℃ ~ +70 ℃ Storage temperature: ‑40 ℃ ~ +85 ℃ Humidity: 5‑95 %RH non‑condensing EMC compliance: Comply with IEC 61000‑4 series industrial electromagnetic‑compatibility standards Dimension & weight: 205 × 170 × 40 mm, weight approx. 0.37 kg Certifications: CE approval

Main Functions Real‑time sampling of motor current and voltage signals, execute medium‑voltage motor soft‑start and soft‑stop control algorithms. Support multiple start‑up modes including current‑limit start, voltage‑ramp start and kick‑start for heavy‑load conditions. Built‑in complete motor‑protection functions: overload protection, phase‑unbalance protection, phase‑loss protection, thyristor fault monitoring. Process external interlock binary‑input signals; output relay‑contact signals for fault alarm and protection blocking. Event logging and fault‑code storage for post‑fault troubleshooting. Realize data exchange with upper‑level PLC and monitoring system via Modbus‑RTU field‑bus. Hardware self‑diagnosis detects internal circuit, measuring‑loop and trigger‑circuit faults, upload fault codes. Parameter configuration, debugging and firmware upgrade are completed by ABB soft‑starter commissioning tool.

Installation Requirement Plug‑in installation inside ASTAT soft‑starter rack. High‑power main‑circuit cables and weak‑signal control cables shall be routed separately. Ensure reliable protective grounding of cabinet. Auxiliary 24 V DC power supply shall stay within rated operating range. After board replacement, confirm full part‑number 3ASC25H203 matches original soft‑starter configuration, restore complete parameter settings. Perform power‑on self‑test, motor start‑up simulation test, I/O loop test and communication verification. Different hardware revisions cannot be directly interchanged without parameter adaptation. Do not put into service until no hardware self‑diagnosis fault alarm exists.

Typical Application Scenarios Main control board for ABB ASTAT series medium‑voltage soft‑starters, widely used for large‑power fan, pump and compressor motor control in power plants, mining, cement plants and petrochemical industries; used for soft‑starter‑system maintenance and spare‑part replacement.

Key Features

1. Core main‑control PCB for ASTAT medium‑voltage soft‑starter, realizes full‑range soft‑start‑stop and motor‑protection functions.
2. Multiple optional start‑stop modes, adaptable to various heavy‑load industrial working conditions.
3. Abundant self‑diagnosis and fault‑recording functions for convenient on‑site fault location.
4. Support Modbus‑RTU field‑bus communication, easy to integrate with plant automation system.
5. Plug‑in rack‑mount structure, convenient for on‑site replacement and maintenance; strict full‑part‑number matching shall be observed during spare‑part replacement.