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Product Model: UFC911B104
Product Brand: ABB
Product Series / Reference: Excitation Control / Power-Supply Module (Order No. 3BHE037864R0104)
Product Features:
- Excitation control or high-voltage power-supply module for synchronous generator systems, designed for reliability in power plant and industrial applications.
- Input voltage range 100-240 VAC (per some supplier data) and maximum output current around 10 A according to component listings.
- Multiple protection features including short-circuit, overload, over-voltage and over-temperature protection built-in as per vendor description.
- OEM spare part availability and aftermarket listing with typical 12-month warranty from specialist suppliers.
- UFC911B104
- UFC911B104
Applications & Industry Context
In heavy industrial settings—such as power generation stations, large petrochemical plants, offshore platforms, or utility generator control rooms—the excitation system of a synchronous generator is critical. It regulates the field current of the generator, thereby maintaining its terminal voltage, reactive power output, stability under load changes and grid disturbances. In that context, the ABB UFC911B104 finds its place as a key module in the generator excitation or field-control subsystem.
When a generator is subject to sudden load changes (e.g., starting large motors, grid disturbances, switching events), the exciter’s ability to respond quickly and reliably can mean the difference between stable operation and a trip or voltage collapse. This module is positioned in that control chain—often inside the generator control panel or exciter cabinet—where it provides either power supply for field circuits or logic/control for field current modulation.
In retrofit scenarios, when legacy excitation boards are becoming obsolete or difficult to source, the UFC911B104 serves as a spare or replacement part. Suppliers list it under order number 3BHE037864R0104 and as “UFC911B104 Circuit Board Module”. For operators seeking to reduce downtime, selecting a known-good module like this and keeping it in their spare inventory makes operational sense.
Further, in utility scale or mission-critical plants where continuity is essential, the module’s built-in protections (overload, overvoltage, overtemperature) enhance reliability and reduce the risk that a minor fault in the field circuit will cascade into a generator shutdown.
Product Role & System Fit
Within a generator control architecture, the UFC911B104 plays the role of either a high-voltage supply unit for the exciter field or an excitation control board, depending on the system design. While public documentation is limited, vendor descriptions suggest that it is used to deliver or regulate excitation field current and/or manage logic in the field control loop.
In system fit, it will typically mount in the exciter rack or control cabinet, interfacing with field wiring (voltage transformer, current transformer, exciter field connections), control logic (AVR, power factor control, protective circuits) and supervisory systems (SCADA or DCS). It is not a standalone generator — rather a module in the excitation chain.
For maintenance engineers: when a generator I/O or control error occurs (e.g., field current drift, voltage regulation inability, or module alarm), you must check whether the logic/control board or the power supply module is at fault. The UFC911B104 is one of those modules where a failure may manifest as voltage regulation instability, so having the correct model (UFC911B104) matched to your system is key.
Technical Features & Benefits
Although the full ABB specification is not publicly available, aggregated supplier data reveal features and practical benefits:
Wide input voltage (100-240 VAC) and output capacity (~10 A)
Some listings note that the UFC911B104 accepts 100-240 VAC input and can deliver an output current up to 10 A.
Benefit: Flexibility for retrofit across different supply voltages and suitability for moderate exciter field currents in generator systems.
Robust protection features
Vendor pages state the unit includes short-circuit protection, overload, over-voltage, over-temperature protection.
Benefit: Increases system reliability by preventing module damage and cascading faults; reduces mean time to repair (MTTR).
OEM part number & aftermarket availability
Listed as 3BHE037864R0104 in many supply listings.
Benefit: Easier sourcing of spares, confidence in compatibility with existing ABB exciter systems.
Compact board-module format
Supplier data reference “Circuit Board Module UFC 911 B104”, suggesting a board module form factor.
Benefit: Easier installation or replacement in panel racks; less wiring disruption.
In the field, replacement of a failing excitation module often restores voltage regulation and stability more quickly than diagnosing wiring or exciter field failures alone. Having a known-good board like UFC911B104 significantly reduces troubleshooting time.
Technical Specifications Table
| Specification | Detail / Value |
|---|---|
| Model | UFC911B104 |
| Ordering / Type Number | 3BHE037864R0104 |
| Module Type | Excitation control / power-supply module for generator exciter systems |
| Input Voltage Range | 100-240 VAC (vendor listing) |
| Maximum Output Current | ~10 A (vendor listing) |
| Protection Features | Short-circuit, overload, over-voltage, over-temperature |
| Form Factor / Module Format | Circuit board module (“Board Module UFC 911 B104”) |
| Typical Warranty (supplier) | 12 months (from supply listings) |
| Common Application | Medium / large synchronous generator excitation systems, power plants, industrial gensets |
Related Models
Here are some related modules you may encounter when managing spares or system upgrades:
- UFC911B106 (3BHE037864R0106) – variant of the same board with different revision.
- UFC910B103 – another model in the UFC900 series, targeted at smaller generators (per some descriptions).
- UFC912A101 (3BHE039426R0101) – listed as a high-voltage fiber optic signal conversion module in ABB’s portfolio.
When stocking spares or upgrading, ensure you match revision codes, board layout, connector pinout and firmware (if applicable) to avoid compatibility issues.
Installation & Maintenance Insights
Based on practical field experience with generator excitation modules, here are some tips regarding installation and maintenance of the UFC911B104:
- Verify compatibility: Before replacement, check that your exciter cabinet uses the UFC911B104 (3BHE037864R0104) and not an earlier or different revision. Mismatches may lead to connector or functional issues.
- Power-down procedures: Excitation boards handle field current circuits—ensure you isolate the field winding, discharge residual energy, and follow safe startup procedures to avoid damage or injury.
- Check wiring & field feedback: After installing the module, verify all field wiring (voltage transformer, current transformer, exciter field leads) is clean, well-terminated and correct. Sometimes faults that appear as “board failure” are actually sensor or wiring issues.
- Keep a spare board: Given the criticality of generator excitation, having a known-good spare UFC911B104 module pre-configured and ready can reduce downtime significantly.
- Record installation details: Note the serial number, installation date, cabinet slot, revision, and any parameter settings. This helps future service or warranty claims.
- Periodic inspection: Every scheduled outage, inspect terminals for tarnish or overheating, check for dust or corrosion in the cabinet, verify module cooling if needed, and monitor for deviation in voltage regulation performance.
