Product Description
UNS0881b‑P V2 (3BHE050077R0102) is an internal interface signal PCB for ABB UNITROL 1000 excitation regulator platform. It provides back‑plane bus signal conditioning, digital input‑output circuitry, galvanic isolation and level conversion. It interconnects main control unit, external field signals and MUB measurement board, handling discrete‑signal routing inside generator excitation cubicles. Revision V2 denotes updated hardware layout. It cannot operate standalone; must be mounted in UNITROL 1000 sub‑rack with CPU, power supply and measurement boards. Spare‑part replacement requires exact hardware revision matching.
Technical Data
表格
| Item | Specification |
|---|---|
| Full part number | 3BHE050077R0102 |
| Board marking | UNS0881b‑P V2 |
| System Platform | ABB UNITROL 1000 excitation system (UNITROL1010 /1020) |
| Hardware format | Eurocard plug‑in module for sub‑rack |
| Board power | 24 VDC supplied via sub‑rack back‑plane |
| Country of origin | Switzerland |
| Operating ambient temp | ‑10 ℃ ~ +60 ℃ (inside control cubicle) |
| Ingress protection | IP00 (bare PCB, cabinet‑mounted) |
| Communication | Internal UNITROL back‑plane bus; field signals via isolated I/O circuits |
| Functions | Digital I/O conditioning, galvanic isolation, level shifting, back‑plane signal routing |
| Weight | Approx. 0.45 kg |
| Lifecycle | Mature active platform, spares available; migration target UNITROL 1000 FLEX |
| Compatibility | Only for UNITROL 1000 rack; NOT compatible with UNITROL5000 / 6000 systems |
Product Performance
- Galvanic isolation on field‑signal circuits protects main DSP controller against surges and electromagnetic noise, improving excitation system immunity.
- Multi‑channel discrete input/output circuits route field signals: field‑on, field‑de‑excitation, external interlocks and fault alarms.
- On‑board hardware diagnostics with status LED indicators; fault events can be retrieved via CMT1000 commissioning tool for troubleshootingABB Group.
- Standard Eurocard mechanical design, plug‑in sub‑rack mounting for convenient maintenance & spare‑part swap.
- V2 hardware revision improves signal integrity and thermal behaviour; V1 and V2 hardware are not directly interchangeable. Always verify full part‑number + revision label on physical board before replacement.
- Pure interface I/O board without independent control algorithm; requires full set of controller, MUB measurement board and power supply to function.
Application Fields
- Internal signal interface for UNITROL 1000 (1010/1020) synchronous‑generator static excitation cubicles
- Spare‑part replacement & overhaul retrofit for thermal, hydro and gas‑turbine generator AVR systems
- Captive industrial power plants, medium‑small synchronous‑machine excitation regulation
- Discrete‑signal routing for excitation interlocks, alarm, field‑apply / field‑suppress functions
- Legacy excitation‑cubicle retrofit & spare‑part projects in power stations
Related UNITROL 1000 family boards
- UNS2881b‑P: MUB Measurement Unit Board for voltage & current sampling
- UNS0881b‑P V1: older‑revision interface board (non‑interchangeable with V2)
- UNS0881b‑P V2 3BHE050077R0102 (this item)
- UNS0900a‑P: UNITROL 1000 power‑supply module
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