ABB UAD215A104 (3BHE026284R0104) – Excitation Control Board for UNITROL Systems

• 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

• 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.

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

• 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.

• 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.

• 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

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.