Description
The 3BDH000505R1 is a 24 V DC System Power Supply Module manufactured by ABB, commonly specified for use with ABB AC 800M / Freelance 800F DCS stations and S800 / S900 I/O racks (functionally equivalent to or cross-referenced with the SD822 / CP-C family in legacy documentation). It converts 100–240 V AC (or 110–300 V DC on select variants) into a stabilized 24 V DC output to power the backplane, I/O modules, communication cards, and field-device loop supplies within a DCS cabinet, and supports parallel operation for N+1 redundancy configurations.
Application Scenarios
Consider a pharmaceutical API plant running ABB System 800xA with S800 I/O in the reactor-control cabinet. One morning the cabinet’s 24 V DC bus drops and all I/O modules lose communication — traced to a failed internal switching supply. Replacing the entire DIN-rail assembly would mean disturbing adjacent terminal blocks and recertifying the panel. Instead, the site electrician isolates the AC input, unclips the failed unit from the DIN rail, snaps the new 3BDH000505R1 into place, reconnects the AC feed and 24 V DC output terminals, and powers up. The green “DC OK” LED illuminates, the I/O rack re-initializes, and batch data logging resumes — total intervention under 10 minutes with zero impact on field terminations. The 3BDH000505R1 directly solves the common pain point of aged DCS power supplies in live panels, letting plants refresh only the failed unit while preserving the certified panel layout and wiring.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3BDH000505R1 (Legacy / Cross to ABB SD822 / CP-C 24/10 family per application) |
| Manufacturer | ABB |
| Product Category | System Power Supply Module — DIN-Rail Mount, 24 V DC Output |
| Input Voltage | 100–240 V AC (85–264 V AC wide range) ± 10 %; 50/60 Hz Some variants also accept 110–300 V DC |
| Output Voltage | 24 V DC ± 1 % (adjustable ± 5 % via potentiometer on some revisions) |
| Rated Output Current | 10 A (240 W) @ 24 V DC, 45 °C ambient |
| Efficiency | ≥ 89–91 % (typical high-efficiency SMPS) |
| Ripple & Noise | < 50 mV p-p (20 MHz BW) |
| Parallel / Redundancy | Yes — up to N+1 parallel with OR-ing diode module (e.g., SD833 / CP-DRED) for 1+1 redundancy |
| Protection Features | Short-circuit (hiccup / fold-back), overload, overvoltage crowbar, overtemperature shutdown, inrush current limiting |
| Indicators | Green LED: DC OK / Output Healthy; Red / Yellow LED: Fault / Pre-alarm (per revision) |
| Operating Temp. | -25 °C to +60 °C (derating above 45 °C–50 °C depending on load) |
| Mounting | 35 mm DIN rail (EN 60715 / TS35), screw-terminal connections |
| Certifications | CE, UL 508 / UL 60950-1, cULus, GL (marine), IEC 61010-1 |
| Dimensions (Approx.) | 110 × 82 × 124 mm (H × W × D — typical for 240 W DIN unit) |
| Weight (Approx.) | 0.9–1.1 kg |
Technical Principles and Innovative Values
- Innovation Point 1 — Redundancy-Ready Parallel Operation with Diode OR-ing: The 3BDH000505R1 is designed to be paralleled with a second identical unit via an external OR-ing diode module (ABB SD833 / CP-DRED), creating a 1+1 redundant 24 V DC bus. If one supply fails, the other seamlessly carries the full load — no process interruption, no transfer switch, no voltage dip — critical for SIL-rated or continuous-process applications.
- Innovation Point 2 — Wide-Range Universal AC Input with Power-Factor Correction: Accepting 85–264 V AC without manual voltage selection and featuring active PFC (> 0.9), the same 3BDH000505R1 works on 110 V site power in North America or 230 V in Europe/Asia, and tolerates sags/swells that would trip lesser linear supplies — ideal for plants with unstable grids or generator-backed sections.
- Innovation Point 3 — Diagnostic DC-OK & Pre-Alarm LED with Dry-Contact Option (select revisions): The front-panel “DC OK” LED gives at-a-glance status; some revisions provide a transistor or relay-ready fault signal that can be wired to the DCS digital input to raise a “Power Supply Degraded” alarm before a full failure — enabling proactive spare replacement during a scheduled outage.
Application Cases and Industry Value
A European brewery running ABB Freelance 800F on its brewing & packaging lines experienced a weekend failure of the sole 24 V DC supply feeding the packaging-line I/O rack — causing a line stoppage. A redundant supply had not been installed originally. The site procured a ABB 3BDH000505R1 and — during the next planned stop — installed it as the primary unit, then added a second 3BDH000505R1 with an OR-ing diode module for 1+1 redundancy.Post-installation, the packaging line’s 24 V bus showed < 20 mV ripple, DC OK was solid green, and the DCS received a healthy pre-alarm contact. The brewery’s automation tech noted: “The 3BDH000505R1 snapped right onto the existing DIN rail, same terminals as the dead unit. Ten minutes and we were back. Adding the second one for redundancy was just as easy — now we won’t have another surprise Sunday morning call-out.”The intervention cost < 3 % of a full panel rebuild and eliminated the single-point-of-failure on a critical packing line.
