Product Overview

• Part No: DTDX991A, alternative code:61430001-UW
• Brand: ABB

• Category: Fiber Optic Communication Interface BoardDTDX991A is a dual-channel fiber signal transmission board developed for ABB UNITROL excitation system and AC800PEC control platform. It realizes galvanic isolation and high-speed real-time data transmission between main control unit and trigger boards via optical fiber. The module transmits control trigger commands and feeds back equipment operating status and fault signals. Optical communication effectively eliminates electromagnetic interference between low-voltage control circuits and high-power power loops, ensuring reliable synchronous signal transmission for thyristor rectifier bridges. It is a critical spare component for maintenance of power station generator excitation cabinets.

• 
  

Core Features

• Dual fiber channel design, support bidirectional high-speed synchronous signal transmission
• Complete electrical isolation via optical fiber, outstanding anti-interference capability in high-voltage cabinet environment
• Standard optical interface, stable connection and convenient field wiring
• Onboard signal status indicators for rapid communication fault diagnosis
• Compact plug-in PCB structure, easy disassembly and direct replacement during overhaul
• Optimized industrial PCB layout, conformal coating optional for humid and dusty power plant sites

• Passed strict EMC and thermal aging tests, stable long-term continuous operation

• 
  

Technical Specifications

• Supply Voltage: 24VDC
• Interface Type: Dual fiber optic port
• Operating Temperature: -20°C ~ +70°C
• Storage Temperature: -40°C ~ +85°C
• Installation: Rack slot mounting inside UNITROL excitation cabinet

• Protection Class: IP20

• 
  

Compatibility & Application

• Compatible with ABB UNITROL series generator excitation equipment, matched with DTCC901B trigger board and UCD224 main control board
• Widely applied in thermal power, hydropower and distributed power station generator excitation system maintenance projects