WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Product Model: UAA326A02
Product Brand: ABB
Product Series / Reference: HIEE300024R2
Product Features:
- Control board module used in generator excitation / automatic voltage regulation systems — core component of exciter control.
- Designed for industrial generator sets and power-system control panels, offering voltage/current monitoring and control logic.
- Recognized in aftermarket listings as a genuine replacement board for ABB excitation systems, with 12-month warranty noted by suppliers.
- Suitable for integration in heavy-duty environments (power plants, utility systems, OEM generator sets).
Applications & Industry Context
Modern power generation operations—whether thermal plants, hydro-electric stations, or large industrial motor-generator sets—rely on a robust excitation system to regulate generator output voltage, respond to load changes, and maintain stability. The ABB UAA326A02 board sits at the heart of such excitation systems. When a generator is brought into service or loaded, the exciter must adjust field current to regulate terminal voltage and power factor. A failure in the excitation control board can lead to voltage collapse, generator trip or instability.
In a typical scenario, this board will be installed inside the generator control cabinet, often next to the AVR, in applications where reliability is critical and downtime is costly. For example, in a steel mill with an on-site generator, or in a utility’s start-up generator facility, the UAA326A02 ensures the excitation system responds correctly to commands and feedback loops.
Because many plants operate legacy equipment, this module is also used during retrofit or spare-parts strategies. Suppliers list the UAA326A02 as “replacement” or “original” for ABB excitation systems (HIEE300024R2). XiongBa 工控+1 For engineers planning maintenance windows, keeping a UAA326A02 on the shelf is a wise strategy to reduce mean time to repair when excitation board failures occur.
Product Role & System Fit
The UAA326A02 board functions as the control brain of a generator excitation system. It receives inputs such as generator terminal voltage, field current feedback, perhaps speed/frequency signals, and issues control outputs to the exciter field circuit (through power electronics or governors). The board monitors protection conditions (over-voltage, under-voltage, overcurrent in field circuit) and communicates with other control modules or the plant DCS.
In system architectures, this board replaces or corresponds to older modules in ABB’s exciter equipment. The reference “HIEE300024R2” indicates the particular revision. When integrating, it must fit the correct slot, backplane or connector interface of the original control panel. Engineers must ensure compatibility of connector pinouts, firmware (if applicable), and revision level.
Given its role, the UAA326A02 is a critical spare in generator control panels. During maintenance, if the existing excitation board shows instability, drift, or error flags, replacing with a known good module such as UAA326A02 can restore system stability without redesigning the panel or re-wiring.
- UAA326A02
Technical Features & Benefits
Though a full factory datasheet is not publicly available, supplier descriptions and field commentary reveal the following features and benefits:
Voltage & Field Current Monitoring Logic
The board supports the measurement of generator terminal voltage and field current (and likely other signals) and applies control algorithms to maintain set voltage under load or excitation changes. Suppliers describe it as “excitation control board… adjust magnitude and phase of excitation current… monitor operating status of generator.”
Benefit: Ensures stable generator output regardless of load variation, maintaining reliability in power generation.
Protection & Diagnostics
Descriptions mention built-in protection functions: overcurrent, overvoltage, under-voltage, frequency deviation, as well as fault diagnosis.
Benefit: Minimizes risk of damage to generator, exciter or field windings; supports preventative maintenance via diagnostics.
OEM Compatibility & Spare Availability
As an ABB board, the UAA326A02 enjoys availability in aftermarket channels; suppliers list 12-month warranties and confirm original board status.
Benefit: Easier procurement, fewer integration surprises, and confidence in spare stock.
Industrial Grade Construction
Though specific environment ratings are limited, the board is used in generator control cabinets (industrial, heavy duty). Supplier listings show storage/operation temperature ranges (–20-70 °C) and mounting suitable for power-generation panels. zzfyplc.com+1
Benefit: Fits demanding environments, supports long service life.
In the field, engineers note that replacing a suspect excitation board with a UAA326A02 often eliminates erratic voltage drift or forced trips. Because the board aligns with original OEM architecture, commissioning time is shorter and system behaviour returns to normal swiftly.
Technical Specifications Table
| Specification | Detail / Value |
|---|---|
| Model / Designation | UAA326A02 |
| ABB Ordering / Type | HIEE300024R2 (also listed as U/A 326 A02) |
| Module Function | Generator Excitation Control Board |
| Application Domain | Generator control panels, excitation systems |
| Typical Operating Temp. | –20 °C to +70 °C (supplier listing) |
| Warranty (Supplier) | 12 months (from specialist sellers) |
| Common Use Industries | Power generation, utilities, heavy industrial |
| Protective Functions | Over‐current, over/under voltage, frequency deviation |
| Manufacturer | ABB |
Related Models
Here are some modules you might encounter when managing spares or upgrading excitation systems:
- UAC326AE01 / HIEE401481R1 – a related exciter board in ABB’s excitation system lineup.
- UAC389AE01 / HIEE300888R0001 – another variant board in the exciter module family.
- Older or similar generator exciter modules – when replacing systems, check your cabinet’s part list to match correct revision.
Installation & Maintenance Insights
Drawing on hands-on automation engineering experience, here are key tips for installing or maintaining a UAA326A02 board:
- Pre-check revision and compatibility: Before inserting the board, verify it is the correct revision (HIEE300024R2) and that connector pinouts and logic match your control panel. Do not assume older part numbers fit.
- Power down and isolate: Always disconnect excitation power and control supply before swapping the board to avoid field winding or control circuit damage.
- Check field wiring & sensors: Because the board interfaces to generator voltage, current and perhaps speed signals, inspect all sensor wiring (VTs, CTs) for correct polarity, integrity and grounding.
- Monitor bias and control loops post-installation: After swapping, monitor generator terminal voltage response during load changes, step changes and excursions to validate board behaviour.
- Spare strategy: Maintain at least one UAA326A02 in stock, pre-labelled, and stored under appropriate conditions (dry, static safe). Since this board is critical in generator control, stocking a compatible module can significantly shorten downtime.
- Record installation details: Log board serial number, revision, installation date, and system parameters. Having this information aids future diagnostics or warranty claims.
- Environmental inspection: Periodically inspect the control cabinet for dust, humidity or corrosion, especially in heavy-duty power generation environments. Even if the board is robust, poor cabinet conditions shorten service life.
