Description
‑ Power Supply: Powered by excitation rack back‑plane bus, 24 VDC auxiliary power
‑ Power Consumption: approx 7.6 W
‑ Mechanical Structure: Eurocard plug‑in board for UNITROL rack, metal front panel, back‑plane bus connector, multi‑channel spring‑type analog signal terminal block
‑ On‑board Resources: multi‑channel analog input conditioning circuit, analog output driving unit, surge‑suppression protection unit, 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 analog input‑output channels, isolation rating 2500 VAC
‑ Signal Types: 4‑20 mA analog input for external field measurement signals; 4‑20 mA analog output for generator active power, reactive power, generator voltage and other parameter transmission
‑ Conversion Performance: high‑precision analog‑digital and digital‑analog conversion, meets excitation system transmitting precision requirement
‑ Protection: input surge‑suppression, over‑range monitoring for analog channels
‑ Status LED Indicators: Power indicator, Module Fault indicator, per‑channel input‑output status LED
‑ Weight: approx 0.91 kg
‑ Collects on‑site 4‑20 mA analog signals from external measuring devices, after isolation and filtering conditioning, transmits measurement data to excitation main‑control board for logic processing.
‑ Receives operating‑parameter data from main‑control board, converts into standard 4‑20 mA analog output signals, sends generator voltage, active power, reactive power, excitation current and other values to DCS system and local field meters.
‑ Channel‑level diagnosis: monitors analog signal loss, over‑range, loop short‑circuit, detects channel hardware abnormality, reports fault information of each individual channel to main‑control board.
‑ Module self‑diagnosis monitors rack power‑supply, signal‑processing circuit and back‑plane bus communication; uploads module‑level fault‑alarm information. Conformal‑coating improves long‑term reliability under harsh power‑plant site condition.
‑ Cannot run independently; must be installed inside UNITROL excitation rack and cooperate with excitation main‑control board. HENF318736R1 is hardware revision variant of G3ESa series; pin‑compatible within G3ESa revision family, cannot directly interchange with other series excitation boards.
‑ Continuously monitors each analog I/O channel 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; analog measured values and fault codes are read via excitation commissioning tool or upper‑level HMI workstation.
‑ Module hardware failure will cause loss of analog input‑output function; excitation AVR regulation and protection logic keep normal running, but 4‑20 mA analog signals for DCS and local meters cannot be transmitted normally.
‑ Back‑plane connector: connects to excitation rack internal bus, receives control data, transmits channel status and diagnostic information to main‑control board.
‑ Analog signal terminal block: wiring terminals for field analog input‑output shielded 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)
- G3ESa analog input‑output interface board (HENF318736R1)
Complementary parts: UNITROL excitation rack and back‑plane, excitation main‑control board, shielded analog signal cables, excitation commissioning software.
‑ Power off the whole excitation rack before inserting or removing this board. Analog wiring must adopt shielded cable with single‑end shield grounding; strictly distinguish analog input loop and analog output loop, avoid wrong wiring causing board burnout.
‑ For spare‑part replacement: Verify complete part number HENF318736R1. After replacement, confirm back‑plane bus identification, verify signal acquisition, analog output precision and channel fault‑reporting function. Hardware revision mismatch will lead to analog measurement and output deviation.
‑ Module hardware fault will result in excitation system analog 4‑20mA signal interaction failure.
Thermal‑power and hydro‑power generator excitation cabinets; ABB UNITROL generator excitation system; industrial spare‑part replacement for excitation standard analog I/O signal‑processing unit.
- UNITROL excitation system dedicated G3ESa analog input‑output board, completes 4‑20mA analog signal collection and analog parameter output towards DCS and local meters, hardware variant HENF318736R1.
- Conformal‑coating processing, adapts to power‑plant high‑humidity and corrosive harsh site environment.
- All external analog channels adopt opto‑coupler galvanic isolation, strong anti‑interference capability for power‑plant strong electromagnetic‑interference scene.
- Independent channel‑by‑channel fault‑diagnosis function, convenient for on‑site analog‑loop fault location.
- Standard Eurocard rack‑mount plug‑in structure, convenient installation and on‑site maintenance.
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