Description
ABB UAD215A104 (3BHE026284R0104) – Excitation Control Board for UNITROL Systems
The ABB UAD215A104, part number 3BHE026284R0104, is a UAD-series control/measurement board used in ABB UNITROL excitation platforms for synchronous generators and large motors. From my experience, this variant appears most often in retrofit and maintenance programs where reliability and drop-in compatibility matter more than anything else. You might notice that plants running hydro or thermal units keep one of these on the shelf, because it typically restores excitation stability fast when a channel goes noisy or an I/O stage fails.
Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week for in-stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express options: FedEx, UPS, DHL
Key Features
- UNITROL platform compatibility – Designed for ABB excitation systems, helping keep legacy and current installations serviceable.
- Stable analog/digital conditioning – Typically handles measurement and I/O tasks critical to field control and protection.
- Industrial-grade build – Good EMC immunity and dependable operation in control cabinets found in power plants and heavy industry.
- Field service friendly – Plug-in, rack-mounted design; status indicators make basic diagnostics straightforward.
- Traceable part identity – Marked as UAD215A104 with 3BHE026284R0104 for exact matching during maintenance and spares audits.
- Procurement-ready – Frequently available from stock, shortening outage time when a board needs immediate replacement.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand / Model | ABB UAD215A104 (Part No. 3BHE026284R0104) |
| Product Type | Excitation system control/measurement board (UAD series), used within UNITROL platforms |
| HS Code | 8538.90 (Parts suitable for apparatus of heading 8535/8536/8537) |
| Power Requirements | 24 VDC nominal (typically 18–30 VDC), low power consumption |
| Dimensions & Weight | Board-level plug-in module; typical card size used in UNITROL racks; lightweight for easy handling |
| Operating Temperature | 0 to +55 °C operation; storage commonly down to -25 °C and up to +70 °C |
| Signal Input/Output Types | Analog measurement channels (voltage/current sensing) and 24 V digital I/O as used in excitation control |
| Communication Interfaces | Proprietary UNITROL rack backplane interface; service indicators for diagnostics |
| Installation Method | Plug-in card for UNITROL rack; front-panel retention hardware; wiring via rack/backplane connectors |
Application Fields
This board is typically used in excitation cabinets for:
- Power generation: hydro, steam, and gas turbine synchronous generator excitation
- Heavy industry: steel mills, mining, pulp & paper—synchronous motor drives and VAR compensation
- Utility and IPP plants needing long-term serviceability of ABB UNITROL systems
- Brownfield upgrades or maintenance spares where form-fit-function compatibility is required
Advantages & Value
- Reliability: Proven board family used in mission-critical excitation loops where uptime matters.
- Compatibility: Variant A104 aligns with ABB part code 3BHE026284R0104 for straightforward replacement.
- Cost control: Avoids full system replacements—target the failed module and minimize outage time.
- Supportability: Clear part identity and documentation trail streamline FAT/SAT records and audits.
- Logistics: Short lead options in many cases, reducing the window between fault and restart.
Installation & Maintenance
- Cabinet environment: Install in a clean, dry control cabinet with adequate ventilation; avoid conductive dust and condensation.
- Rack & wiring: Power down and follow LOTO procedures. Seat the board fully into the UNITROL backplane and secure the front fasteners.
- Grounding & EMC: Maintain cabinet grounding; route signal wiring away from high-current busbars to minimize noise.
- ESD handling: Use ESD wrist straps and antistatic packaging when removing/transporting the module.
- Commissioning: Verify firmware/parameter set as per your unit records; run excitation loop tests and record baselines.
- Routine care: Periodically check connector tightness, clean with dry air if needed, and review alarm logs for early signs of drift.
One thing I appreciate is how quickly technicians can swap this board during an outage. A maintenance lead at a hydro plant told us it dropped straight in and cleared an intermittent excitation fault that had been nagging them for weeks.
Quality & Certifications
- Conformity: Typically complies with CE requirements for industrial control equipment
- RoHS: Components generally supplied in RoHS-compliant builds unless otherwise specified
- Manufacturing: Produced under ISO 9001 quality management at ABB facilities
- Warranty: 12-month warranty (365 days) from shipment
Related/Supporting Components
If you’re planning a full maintenance window, it often makes sense to review companion modules used alongside the UAD-series boards in UNITROL racks (e.g., protection boards, power interface cards, and I/O expansion modules). Matching the exact variant code (like the A104 suffix) usually ensures the best plug-and-play result.
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