Description
At-A-Glance Executive Brief
- Model: HIEE300888R0002, part designation UAC389AE02
- Brand: ABB
- Part Type: Generator excitation control PCB
- Lifecycle status: OEM obsolescent, stocked for power plant brownfield Unitrol excitation retrofits
- System compatibility: ABB Unitrol 5000 / Unitrol 6000 generator excitation systems
- Weight: 0.58 kg
Technical Introduction
Generator voltage regulation and reactive power control are lost immediately if this excitation control board fails, risking generator trip and plant instability. The UAC389AE02 (HIEE300888R0002) is a core processing board for ABB Unitrol generator excitation cubicles. It samples PT/CT secondary signals, executes voltage regulation logic and firing pulse generation for the thyristor power stack. It interfaces analog and discrete field signals, communicates status, setpoints and fault alarms to the plant DCS system. Onboard signal conditioning provides transient protection for measurement inputs. Power generation sites keep spare boards to reduce outage duration while planning legacy excitation system migration.
- Best Suited For
- Unitrol 5000 and Unitrol 6000 generator excitation cabinets
- Hydro and thermal generator voltage & reactive power regulation control
- Direct drop-in replacement for existing UAC389AE02 series excitation control hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | HIEE300888R0002 (UAC389AE02) |
| Platform | ABB Unitrol Excitation System |
| Function | Excitation regulation, signal acquisition, pulse generation |
| Signal Inputs | Generator PT/CT secondary, 4–20mA, ±10VDC analog signals |
| Onboard Protection | Transient suppression, RFI filtering, overvoltage clamping |
| Isolation | 2.5kV AC channel-to-ground isolation |
| Indicators | Power LED, fault and status diagnostic LEDs |
| Mounting | Rack mount inside Unitrol excitation cubicle |
| Operating Temp | -5°C ~ +70°C |
| Weight | 0.58 kg |
| Environmental Details | Please refer to the OEM datasheet for complete environmental tolerances. |
Field Engineer’s Tech Notes
- Backplane jumpers and hardware configuration must match the original board. Mismatched jumpers will alter regulation gains and cause unstable generator voltage control after replacement.
- The board connects directly to high voltage PT/CT secondary circuits. Perform lockout/tagout and verify zero energy before removing or swapping the PCB to prevent shock hazards.
Adaptive QA & Testing Protocol
Each board is bench tested using Unitrol excitation test hardware. We inject simulated PT and CT signals to validate measurement acquisition and regulation response. Analog 4–20mA and ±10V signals are applied to test I/O span. Fault alarm outputs and diagnostic LED behavior are verified under normal and simulated fault states. Backplane communication paths are checked for stable signal transfer. Full test reports or bench test video clips are available upon request.
Buyer’s FAQ
Q: What is the relationship between HIEE300888R0002 and UAC389AE02? A: UAC389AE02 is the board model name, HIEE300888R0002 is ABB’s drawing/part reference number; both refer to the identical Unitrol excitation control PCB.
Q: What warranty applies for refurbished and NSFP HIEE300888R0002? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes damage caused by high-voltage transients, incorrect jumper configuration or improper commissioning tuning.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory is depleted, lead time increases while we source surplus Unitrol excitation boards.
Q: Can this board work on ACS6000 medium voltage drives? A: No. This PCB is designed exclusively for Unitrol generator excitation systems, not MV drive control stacks.
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