Description
‑ Power Supply: Powered by excitation rack back‑plane bus, auxiliary 24 VDC field signal
‑ Power Consumption: approx 9.2 W
‑ Mechanical Structure: Eurocard plug‑in board, metal front panel, dual back‑plane bus connectors, multi‑row spring‑type external signal terminal block
‑ On‑board Resources: opto‑coupler isolation input circuit, relay output driving circuit, surge‑suppression protection unit, signal filtering circuit, per‑channel diagnosis logic, back‑plane bus controller, module self‑diagnosis circuit, conformal coating protection layer
‑ Communication Interface: Internal dedicated back‑plane bus for excitation main control board
‑ Galvanic Isolation: Galvanic isolation for all external signal channels, isolation rating 2500 VAC
‑ Signal configuration: multi‑channel binary digital input for interlock, trip feedback and auxiliary status; multi‑channel relay dry‑contact output for trip, alarm and interlock‑control commands
‑ Relay load characteristic: dry‑contact output, suitable for power‑plant cabinet auxiliary‑circuit load
‑ Status LED Indicators: Power indicator, Module Fault indicator, per‑channel input‑output status LED
‑ Weight: approx 0.98 kg
‑ Collects on‑site hard‑wire binary contact signals: cabinet door interlock, external protection trip feedback, cooling‑fan status, auxiliary‑relay contact feedback; after opto‑isolation and filtering, transmits signal state to excitation main‑control board for logic processing.
‑ Receives control instructions from main‑control board, drives onboard relay outputs, completes excitation trip output, fault alarm signal output and external equipment interlock control.
‑ Channel‑level diagnosis: monitors input signal loss, field‑loop short‑circuit, relay driving circuit abnormality, reports fault information of each individual channel to main‑control board.
‑ Module self‑diagnosis monitors rack power‑supply, internal circuit running state and back‑plane bus communication, uploads module‑level fault‑alarm information. Conformal‑coating treatment improves long‑term reliability under high‑humidity environment.
‑ Cannot run independently; must be installed inside UNITROL excitation rack and cooperate with excitation main‑control board. HNLP205879R1 is hardware revision variant of BDD110 series; pin‑compatible within BDD110 revision family, cannot directly interchange with other series excitation boards.
‑ Continuously monitors each I/O channel working status, module power‑supply and internal hardware health. Detected faults activate fault LED and send fault word to excitation main controller.
‑ No local numerical display; channel working status and fault codes are read via excitation commissioning tool or upper‑level HMI workstation.
‑ Module hardware failure will cause partial or total loss of hard‑wire binary input‑output channels; excitation AVR regulation logic keeps running normally, but hard‑wire trip, interlock and alarm signals cannot be transmitted normally.
‑ Back‑plane connectors: connects to excitation rack internal bus, receives control instruction, transmits channel status and diagnostic information to main‑control board.
‑ External spring‑type signal terminal block: wiring terminals for field interlock, trip feedback and relay output signal cables.
‑ Mounting: Plug‑in installation inside UNITROL excitation cabinet rack
‑ Operating Temperature: ‑20 °C ~ +60 °C
‑ Storage Temperature：−40 °C ~ +70 °C
‑ Relative Humidity: 5‑95 %RH, non‑condensing
‑ Protection Class: IP20 (cabinet internal)
- BDD110 binary digital input‑output board (HNLP205879R1)
Complementary parts: UNITROL excitation rack and back‑plane, excitation main‑control board, field shielded signal cables, excitation commissioning software.
‑ Power off the whole excitation rack before inserting or removing this board. Field wiring adopts shielded cables with single‑end shield grounding; strictly distinguish input signal loop and relay output power loop, avoid wrong wiring causing board burnout.
‑ For spare‑part replacement: Verify complete part number HNLP205879R1. After replacement, confirm back‑plane bus identification, verify signal acquisition, relay‑output action and channel fault‑reporting function. Hardware revision mismatch will lead to signal incompatibility.
‑ Module hardware fault will lead to failure of related hard‑wire interlock, trip and alarm signal channels.
Thermal‑power and hydro‑power generator excitation cabinets; ABB UNITROL generator excitation system; industrial spare‑part replacement for excitation binary hard‑wire I/O interface unit.
- UNITROL excitation system dedicated BDD110 binary I/O board, completes large‑quantity hard‑wire interlock‑signal acquisition and trip‑alarm relay output, hardware variant HNLP205879R1.
- Conformal‑coating processing, adapts to power‑plant high‑humidity and corrosive harsh site environment.
- Every external signal channel adopts opto‑coupler galvanic isolation, strong anti‑interference capability for strong electromagnetic‑interference scene of power plant.
- Independent channel‑by‑channel fault diagnosis function, convenient for on‑site hard‑wire loop fault location.
- Standard Eurocard rack‑mount plug‑in structure, convenient installation and on‑site maintenance.
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