Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Product Overview
XVC768101 (3BHB007211R101) is a plug‑in interface circuit card for legacy ABB UNITROL generator excitation control systems. It handles analog measurement signal conditioning, field‑circuit feedback acquisition, and internal backplane data exchange between power‑stage hardware and the main exciter controller. This board converts raw generator‑side measurement signals into conditioned, noise‑supplied data for regulation logic, widely deployed on thermal, hydro‑electric and combined‑cycle power‑plant synchronous generator units. OEM original manufacturing has been discontinued; spare‑part stock is sourced via global procurement portals as new‑surplus or professionally refurbished units for outage‑driven maintenance and retrofitting projects.
Core Technical Specifications
- Manufacturer Part Number: XVC768101 / 3BHB007211R101
- Product Category: Excitation System Interface Circuit Card
- Applicable System: Legacy ABB UNITROL excitation rack‑based hardware
- Operating Supply: 24 VDC nominal rack‑supply power
- Signal Handling: Analog signal conditioning for generator voltage, field‑current feedback; galvanic isolation for measurement inputs to suppress ground‑loop noise
- Mechanical Form: Standard rack‑mount plug‑in PCB card, edge‑connector backplane interface
- Environmental Ratings: Operating temperature 0 °C ~ +60 °C; storage −40 °C ~ +85 °C; humidity 5‑95 % non‑condensing; cabinet‑mount IP20 rating; meets power‑plant EMC requirements
- Weight: Approx. 0.30 kg
Key Features
- Conditions raw field‑measurement signals for generator excitation closed‑loop regulation; delivers cleaned signals to the main exciter control module.
- Galvanically isolated input circuits improve noise immunity in high‑EMI power‑station cabinet environments.
- Standard plug‑in rack‑mount form factor supports fast card swap‑out during scheduled plant shutdown windows.
- Provides status feedback paths for upper‑level DCS event logging and excitation‑fault alarm reporting.
- Critical spare for ageing UNITROL installations, eliminates forced‑outage risk caused by original‑card component degradation.
Incoming Quality‑Check Procedure
- Visual inspection: Inspect PCB for burn traces, bulging electrolytic capacitors, cracked solder joints, component damage and edge‑connector contact wear.
- Label validation: Cross‑check hardware marking for XVC768101 / 3BHB007211R101, verify no label overlay or tampering.
- Edge‑connector inspection: Check gold‑plated contact fingers for corrosion, bent pins or oxidation.
- Firmware & hardware cross‑reference: Confirm this card revision matches the target UNITROL rack hardware and controller firmware version.
- Bench power‑on test: Install within matching test rack, apply 24 VDC supply; verify self‑diagnostic status without hardware fault flags.
Critical Technical Warnings & Procurement Notes
- This is a legacy UNITROL‑specific interface card; physical similarity to other XVC‑series boards does not guarantee interchangeability. Confirm exact part number and system revision before placing orders.
- Firmware mismatch between the main exciter controller and XVC768101 will trigger measurement deviation, false excitation alarms or improper voltage regulation.
- Hot‑swap is strictly prohibited. Execute full lock‑out‑tag‑out, de‑energize excitation rack and generator‑field circuits before card insertion or removal. Live‑card removal can lead to generator trip events.
- The most common failure mode for aged units is degraded electrolytic capacitors on the PCB; pay special attention when evaluating refurbished hardware.
- OEM production is ended. Lead‑times fluctuate according to global stock availability; allocate sufficient time for customs databases import clearance and logistics arrangements.
Frequently Asked Questions
Q: Can XVC768101 work with any UNITROL cabinet?A: No. It is compatible with specific legacy UNITROL hardware generations. Both rack slot mechanical fit and matching system revision must be validated against site documentation.
Q: What typical failure symptoms appear on a faulty XVC768101?A: Fluctuating generator voltage readings, false field‑current alarms, loss of measurement feedback, and excitation‑system self‑test failure after power‑on.
Q: Does 3BHB007211R101 have alternate OEM part numbers?A: = 3BHB007211R101; this is the complete official material designation for this interface card.
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