ABB DAPU100 3ASC25H204 Drive Auxiliary Processing Unit

DAPU100 with part number 3ASC25H204 is the auxiliary processing board matched with DAPC100 main control card for ABB Symphony ASTAT thyristor drive system. It undertakes auxiliary signal processing, logic judgment and peripheral I/O coordination tasks, sharing computing load from the main control board. It connects with DATX110 digital terminal boards via optical fiber bus to collect field switch and analog feedback signals for multi-motor coordinated speed regulation.

This obsolete auxiliary drive board is an essential maintenance spare for thermal power, metallurgy and papermaking ASTAT variable speed control cabinets. It adopts conformal coated PCB for anti-corrosion, supports hot-swap on standard Symphony rack, and equips front LED indicators to quickly locate fiber communication loss, power supply and signal loop faults during on-site maintenance.

Main Specifications

• Brand: ABB; Model: DAPU100; PN: 3ASC25H204; Matching System: Symphony DCS ASTAT Thyristor Drive
• Core Chip: High-speed 32-bit RISC processor, built-in 8MB program storage and data cache
• Communication Interfaces: 1Mbps fiber optical link with DAPC100; serial port X5 for PC debugging; signal terminals X7/X8
• Power Input: 24VDC control power, single standard rack slot installation
• Matched Hardware: DAPC100 main control board, DATX110 I/O terminal, DARA series thyristor power units
• Environment: Operating -10℃ ~ +60℃, storage -40℃ ~ +85℃, 5%–95% RH non-condensing, IP20 cabinet rating
• Diagnostics: Multi-status LED lights for power, fiber link, signal abnormal and hardware fault alarms
• Certifications: CE industrial EMC certification, anti-surge circuit design for heavy industrial environments

Core Functions

• Undertake auxiliary logic calculation, fault signal sorting and peripheral I/O data preprocessing to reduce operation burden of DAPC100 master control module.
• Optical fiber high-speed data transmission realizes real-time data interaction with the main control board, ensuring synchronous closed-loop speed and torque regulation of thyristor power units.
• Collect digital switch signals and auxiliary analog feedback from DATX110 terminal boards, filter interference and transmit standardized data to main controller.
• Execute drive system interlock protection logic, output fault trigger signals when overcurrent, overheat and loss of feedback occur to cut off thyristor pulse output.
• Hot-swappable modular design allows independent replacement without shutting down the whole drive system, shortening downtime of continuous production equipment.
• RS232 debugging port supports offline parameter configuration and firmware upgrade via ASTAT Tool software for drive parameter optimization.

Application Scenarios

• Auxiliary control board spare replacement for ABB Symphony ASTAT drive cabinets in thermal power plants, boiler fan and water pump speed regulation systems.
• Drive signal processing spare parts for metallurgical rolling mills, paper mill main drive and chemical reactor large motor variable frequency control systems.
• Maintenance backup inventory for coal chemical, cement plant and pipeline large fan thyristor speed regulation control cabinets.
• Matching auxiliary processing accessory paired with DAPC100 main control board, DARA thyristor power modules and DATX110 I/O terminals.
• Retrofit replacement components for aging drive systems suffering fiber communication interruption, auxiliary logic failure and signal acquisition drift faults.

• Global aftermarket spare stock for automation maintenance teams managing legacy ABB Symphony DCS ASTAT variable speed drive equipment worldwide.