Description

The UNS2880B-P (ABB order code 3BHE014967R0002) is a high-reliability, DIN-rail mounted power supply module engineered specifically for ABB’s AC 800M-based control systems and S800 I/O stations within the System 800xA architecture. Delivering a stable 24 VDC output at up to 20 A (480 W), this industrial-grade unit supports both standalone and redundant (N+1) configurations, featuring built-in diagnostics, wide input voltage tolerance, and fanless convection cooling—ensuring uninterrupted power for mission-critical automation in power, oil & gas, and heavy industry.

Application Scenarios

At a nuclear power plant undergoing digital I/O modernization, engineers needed a power solution that could guarantee 24/7 availability for safety-related S800 I/O racks—where even a brief brownout could trigger regulatory reporting. They deployed dual UNS2880B-P units in parallel redundancy mode across all critical cabinets. During a site-wide 200 ms voltage dip caused by a motor startup, the UNS2880B-P’s 20 ms hold-up time and seamless load-sharing prevented any disruption. The integrated “DC OK” relay provided real-time health status to the DCS, enabling predictive maintenance before capacitor aging became an issue. This silent resilience turned power from a utility into a strategic layer of system integrity.

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Technical Principles and Innovative Values

Innovation Point 1: True Hot-Swappable Redundancy Ready – The UNS2880B-P features current-sharing circuitry that enables safe insertion/removal under load when used with ABB’s URD2880 diode redundancy module—eliminating downtime during PSU replacement in live systems.

Innovation Point 2: Integrated “DC OK” Relay for Predictive Diagnostics – Unlike generic PSUs, the UNS2880B-P provides a dry contact that signals output health, enabling early detection of degradation (e.g., capacitor ESR rise) before failure occurs.

Innovation Point 3: Optimized for ABB S800 I/O Load Profiles – Designed with low output ripple (<100 mVpp) and high peak current capability to handle inrush from solenoid valves and relay coils without voltage sag—critical for discrete I/O reliability.

Innovation Point 4: Global Input Compatibility with Universal Safety Certs – A single UNS2880B-P unit operates worldwide without rewiring, simplifying spares management for multinational operators and OEMs.

Application Cases and Industry Value

In a Middle Eastern LNG export terminal, ambient temperatures regularly exceed 50°C—causing premature failure of standard power supplies in outdoor I/O shelters. After switching to UNS2880B-P units, which operate reliably up to 70°C with derating, the facility saw a 90% reduction in PSU-related work orders over 18 months. Maintenance teams leveraged the “DC OK” signal to integrate power health into their CMMS, scheduling replacements based on actual performance—not calendar time. One reliability engineer noted, “The UNS2880B-P doesn’t just survive the desert—it thrives in it.”

Related Product Combination Solutions

URD2880: ABB redundancy diode module – enables N+1 parallel operation of UNS2880B-P units.

TU840 / TU854: S800 I/O baseplates – directly powered by UNS2880B-P via TB820 terminal blocks.

TB820: Power distribution terminal – recommended for clean, fused connection between UNS2880B-P and I/O modules.

AC 800M PM866A / UAC326AE: Controllers – rely on stable 24V from UNS2880B-P for CPU and communication integrity.

UNS2880B: Non-P variant – legacy version; UNS2880B-P offers enhanced diagnostics and efficiency.

Phoenix Contact QUINT4-PS/3AC/24DC/20 – competitor alternative, but UNS2880B-P ensures native compatibility with ABB System 800xA diagnostics.

ABB Ability™ Asset Performance Management: Integrates “DC OK” and temperature data from UNS2880B-P for predictive maintenance dashboards.

Installation, Maintenance, and Full-Cycle Support

Installing the UNS2880B-P is straightforward: mount on DIN rail, connect L/N/PE (or DC±), and wire 24 VDC+/– to downstream loads via TB820 or fused terminals. For redundancy, install a URD2880 module and enable parallel mode per ABB guidelines. Ensure ≥20 mm clearance on both sides for convection cooling—especially in high-ambient environments.

Routine maintenance involves visual inspection of status LEDs (green = OK) and periodic verification of output voltage. The “DC OK” relay can be wired to a PLC or DCS for automated health logging. In redundant setups, failed units can be replaced without powering down the cabinet. We provide full lifecycle support, including firmware-free operation (no updates needed), long-term spare parts commitment, and technical validation for SIL-rated or classified area deployments.

Contact us for a customized solution—whether you’re designing a new DCS cabinet, hardening an existing plant against power vulnerabilities, or ensuring compliance in safety-critical infrastructure, the ABB UNS2880B-P(3BHE014967R0002) delivers industrial-grade power integrity with intelligent diagnostics and seamless ABB ecosystem integration.