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ABB UAA326A02 Complete Kit UNITROL Excitation Field Current Isolation & Measurement PCB Board

ABB UAA326A02 complete kit is a turnkey DC field current signal conditioning PCB solution customized for ABB UNITROL digital excitation platforms, covering all supporting wiring and communication accessories required for rack installation and on-site commissioning. The core UAA326A02 board adopts multi-layer industrial-grade PCB with full polyurethane conformal coating, which effectively blocks dust, condensation, corrosive gas and coastal salt mist to extend long-term service life in harsh power station control cabinets.

This module integrates high-precision DC current sensing circuits and isolated signal conversion units. It receives raw DC field current signals from shunt resistors or DC current sensors installed on the thyristor rectifier output loop, linearly converts high-amplitude DC current into standard low-level analog signals compatible with UAD142A01 analog input boards. All measurement channels are equipped with independent surge suppression, low-pass filter and 2000V AC galvanic isolation circuits, completely isolating high-current power loops from low-voltage control circuits to prevent PCB burnout caused by DC short-circuit, rectifier breakdown and voltage transients.

An onboard independent DDCS fiber optical communication interface realizes bidirectional noise-free digital data transmission between UAA326A02 and UNITROL main control boards (UFC765AE102, UNITROL1000 core controllers). Optical fiber thoroughly eliminates electromagnetic interference from high-power rectifier bridges, guaranteeing undistorted real-time field current feedback for AVR, PSS and all generator limit protection algorithms. Embedded real-time self-diagnosis logic continuously monitors signal open-circuit, over-range current and fiber communication loss faults; front panel LED lights give intuitive visual alarms, and all fault events are stored with millisecond timestamps in local Flash memory without power loss.

The backplane plug-in modular design supports single-board hot-swap replacement without shutting down the entire excitation cabinet, drastically reducing power generation downtime during maintenance. Official CMT1000 PC commissioning software supports one-click current signal calibration, real-time field current waveform monitoring and fault log export analysis, greatly shortening on-site excitation system debugging cycles. The full kit includes original UAA326A02 main measurement PCB, matched signal isolation terminal blocks, DDCS fiber optical cables, backplane power connection accessories and printed operation & maintenance manual, ready for direct rack mounting without extra accessory procurement.

UAA326A02

Complete Technical Parameters:

DC Field Current Measurement Performance

Sensing Signal Type: DC analog signal from excitation shunt / DC current sensor
Measurement Range: Adaptable to 0–20A continuous field DC current (custom factory calibration)
Measurement Precision: ±0.1% full scale (FS) under rated operating conditions
Signal Conversion Mode: Linear isolated DC signal conditioning for 16-bit ADC sampling
Channel Isolation Grade: 2000V AC galvanic isolation between measurement circuit & control ground
Built-in Protection: Over-range current limiting, TVS surge suppression, multi-stage RC low-pass filter
Ripple Suppression Rate: ≥96% filtering efficiency for rectifier DC ripple noise
Signal Response Speed: ≤1.2ms fast tracking of field current transient changes

Communication Interfaces

DDCS Fiber Optical Port: Single independent optical channel for main control board data exchange
Internal Backplane Bus: Inter-board parameter synchronization and system status sharing
Fiber Transmission Delay: ≤18μs low-latency real-time data upload
Circuit Isolation: Communication loops fully separated from DC high-current measurement channels

Power & Storage

Auxiliary Operating Power Supply: DC 24V, fluctuation tolerance 18V ~ 32V
Typical Full-Load Power Consumption: 30W
Non-Volatile Flash Memory: Stores up to 1000 timestamped overcurrent, disconnection and communication fault logs
Data Retention: Historical fault records permanently stored without battery backup

Mechanical & Environmental Specifications

Installation Method: Standard UNITROL cabinet backplane plug-in modular structure
Overall Dimensions: 220mm × 165mm × 42mm
Single Board Net Weight: 0.34kg; Full Kit Total Weight: 0.70kg
Continuous Operating Temperature: -25℃ ~ +70℃
Storage Temperature Range: -40℃ ~ +85℃
Ambient Humidity: 5% ~ 95% non-condensing
PCB Surface Protection: Full conformal anti-moisture & anti-corrosion coating
EMC Compliance Standard: IEC 61000-6-2 industrial anti-electromagnetic interference standard
Safety Certifications: CE, UL, RoHS certified
Industrial MTBF: ≥93,000 hours stable continuous operation

Compatible Equipment & Matching Software

Applicable Excitation Systems: ABB UNITROL 1000, UNITROL 5000, UNITROL 6000 digital excitation series
Matched Sampling Board: UAD142A01 3BHE012551R0001 analog signal acquisition PCB
Matched Main Control Boards: UFC765AE102, UNITROL1000 3BHE014557R0003 core excitation controllers
Upper DCS Control Platforms: ABB Symphony Plus, AC800M, System 800xA
Official Commissioning Tool: ABB CMT1000 Excitation Parameter Configuration & Debug Software

UAA326A02

Main Features & Competitive Advantages:

Core Features

High-precision DC field current isolation measurement, provides core feedback signal for FCR constant current excitation control
2000V AC reinforced channel isolation design, effectively block high DC ripple and rectifier electromagnetic interference
DDCS fiber optical communication, zero noise transmission of real-time rotor current data to main control board
Full conformal coated PCB, stable long-term operation in high-humidity, dusty and coastal salt-mist power station environments
Multi-stage built-in filter and surge suppression circuits, eliminate rectifier harmonic and switching transient interference
Real-time self-diagnosis with front-panel LED fault indicators, fast positioning of wiring breakage or overcurrent faults
Non-volatile timestamped fault log storage, convenient post-failure excitation equipment operation analysis
Standard UNITROL rack plug-in module, support hot-swap single-board maintenance without cabinet power cut-off
One-click DC current signal calibration via CMT1000 software, drastically reduce field engineering debugging workload
Unified factory standard spare part, fully plug-and-play interchangeable with all batches of UAA326A02 modules

Key Advantages

All-in-one Complete Kit: Pre-equipped terminals, fiber cables and operation manuals, one-stop procurement avoids accessory matching errors
Ultra-Stable Excitation Control: Accurate field current feedback ensures reliable overload protection and constant current regulation performance
Low Equipment Failure Risk: Independent high-isolation design greatly reduce downstream sampling board burnout risks caused by rectifier faults
Ultra-Wide System Compatibility: Perfect matching with all mainstream UNITROL excitation systems, ideal for old power plant cabinet renovation and spare inventory
Extreme Environment Adaptability: Wide temperature working range and anti-corrosion coating suitable for northern cold hydropower stations, tropical offshore platforms and high-temperature thermal power plants
Global Grid Standard Compliance: Precise field current monitoring meets ENTSO-E grid code requirements for generator excitation overload protection and FRT logic
Global Export Qualified: CE & UL safety certification, satisfy technical standards of power generation projects in all overseas regions
Optimized Cabinet Layout: Integrated dedicated field current measurement module avoids additional external DC signal isolation transducers, saving cabinet internal space

Operational Steps：

Once installed, the ABB UAA326A02 executes the following operational functions:

Logic Execution: The module continuously scans inputs, executes the user-defined control program, and updates outputs in real-time.

Data Handling: The ABB UAA326A02 aggregates process data and transmits it to SCADA systems or cloud endpoints via its integrated communication stack.

Diagnostics: It performs self-checks on memory, I/O paths, and communication links. Any faults detected by the ABB UAA326A02 are logged and signaled via LED indicators or network alarms.

Redundancy Management: In dual-redundant setups, the ABB UAA326A02 synchronizes state information with its partner module to ensure bumpless transfer during failover events.

Remote Access: Authorized personnel can connect to the ABB UAA326A02 remotely for firmware updates, parameter tuning, and troubleshooting.

Application Fields:

Conventional Power Generation Industry

Thermal power plant UNITROL 5000/6000 excitation cabinet rotor field current monitoring module
Hydropower and pumped storage generator digital excitation DC current signal conditioning board
Gas turbine, biomass distributed power station excitation system upgrade replacement spare part

New Energy Power Equipment

Onshore & offshore wind turbine synchronous generator excitation front-end field current measurement unit
Grid-connected energy storage station generator rotor excitation parameter monitoring PCB

Heavy Industrial Self-Generating Power Stations

Steel mill large synchronous motor power factor control excitation DC current sampling board
Underground mine independent power plant generator excitation cabinet daily maintenance spare component

Offshore & Oil & Gas Engineering

Offshore drilling platform self-contained power generator UNITROL excitation field current isolation board
Coastal chemical plant anti-salt mist excitation cabinet high DC current signal safety barrier module

Automation Retrofit & Renovation Projects

Direct replacement of aging field current measurement boards of old ABB UNITROL excitation cabinets
Upgrade of un-isolated DC field current signal circuits to high-safety galvanically isolated measurement systems

Marine Onboard Power Systems

Vessel main synchronous generator digital excitation cabinet rotor field current sensing PCB

FAQ:

Q1: What accessories are contained in the ABB UAA326A02 full complete set?

A1: The full kit includes original UAA326A02 field current measurement main PCB, matched signal isolation terminal blocks, DDCS fiber optical jumpers, backplane power connecting accessories and printed official operation & commissioning manual, all parts ready for direct rack installation.

Q2: Which ABB excitation hardware is UAA326A02 compatible with?

A2: It is a dedicated DC field current measurement board for ABB UNITROL 1000, UNITROL 5000 and UNITROL 6000 digital excitation systems, perfectly matched with UAD142A01 analog sampling boards, UFC765AE102 and UNITROL1000 series main control boards.

Q3: What signal does UAA326A02 measure?

A3: It collects DC rotor field current signals from the generator excitation thyristor rectifier output loop, converts high-current raw signals into isolated low-level analog signals for system closed-loop control and overload protection.

Q4: What communication mode is adopted between UAA326A02 and excitation main control board?

A4: DDCS fiber optical communication is used for bidirectional digital measurement data transmission, which completely isolates low-voltage signal circuits from high-current rectifier power loops to eliminate electromagnetic interference.

Q5: Is the circuit board protected for harsh industrial environments?

A5: The whole PCB is covered with full polyurethane conformal coating, which can effectively resist dust, moisture, condensation and salt mist in coastal and offshore power station control cabinets.

Q6: Can UAA326A02 be replaced without shutting down the whole excitation cabinet?

A6: Yes, it adopts standard backplane plug-in modular design, supporting single-board hot-swap replacement to avoid complete unit shutdown and power generation loss during maintenance.

Q7: What software is used for DC current signal calibration and system debugging?

A7: Official ABB CMT1000 excitation commissioning software, supporting field current signal auto-calibration, real-time waveform monitoring and fault log export analysis.

Q8: What is the continuous stable operating temperature range of UAA326A02?

A8: Continuous stable operation temperature range: -25℃ ~ +70℃; storage temperature range: -40℃ ~ +85℃, adapting to various extreme power station operating environments.

Q9: Does this measurement board record abnormal field current data?

A9: Equipped with onboard non-volatile Flash memory, it stores up to 1000 timestamped fault records including field current over-range, signal open circuit and fiber communication loss; data will not be lost after power failure for post-failure equipment analysis.

Q10: Can UAA326A02 directly replace old batches of the same model board?

A10: 100% plug-and-play interchangeable. UAA326A02 is unified factory standard version, no wiring adjustment or current ratio calibration required during replacement.

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