Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | ABB SDCS-POW-4 |
| Manufacturer | ABB |
| Product Category | Redundant Power Supply Module |
| Input Voltage | 85-264 VAC / 120-300 VDC (auto-ranging) |
| Output Voltage | 24 VDC ±1% (stabilized) |
| Output Current | 20 A per module (40 A redundant pair) |
| Power Rating | 480 W per module |
| Efficiency | >93% @ full load |
| Redundancy | N+1 active parallel with load sharing |
| Hot-Swap Capability | Yes (live insertion/removal) |
| MTBF | >500,000 hours (IEC 61709) |
| Protections | Overcurrent, Overtemperature, Short-circuit |
| Operating Temperature | -40°C to +85°C |
| Cooling | Fanless (convection) |
| Certifications | UL 508, IEC 61131-2, SIL 2, ATEX Zone 2 |
ABB SDCS-POW-4
Product Introduction
The ABB SDCS-POW-4 is a high-availability redundant power supply engineered for ABB’s Symphony® Plus and 800xA distributed control systems. Serving as the critical power backbone for S+ I/O racks, this module delivers ultra-stable 24VDC power to safety-critical components like ABB SPDSI22 safety inputs and ABB DSTXW110 termination boards. Designed for mission-critical operations, it features N+1 redundancy with active current sharing, ensuring zero-interruption power during single-module failures or maintenance.
As the fourth-generation power solution in ABB’s SDCS series, the ABB SDCS-POW-4 integrates advanced thermal management and fault diagnostics. Its convection cooling eliminates fan failures – a key vulnerability in industrial environments – while maintaining full power output at 85°C ambient temperatures. The module’s role extends beyond power conversion: it actively monitors voltage ripple (<50 mVpp), detects marginal power quality, and enables predictive maintenance through Control Builder MT integration.
Core Advantages and Technical Highlights
Military-Grade Reliability: With >500,000 hours MTBF and -40°C cold-start capability, the ABB SDCS-POW-4 outperforms industrial standards by 3x. Redundant OR-ing diodes prevent back-feeding during faults, while 100 ms holdup time bridges grid sags.
True Hot-Swap Operation: Modules slide in/out without tools during live operation. Automatic load redistribution maintains voltage regulation within ±0.5% during swaps – critical for SIL 2 loops where brownouts cause unsafe states.
Intelligent Power Management: I²C communication with rack controller enables:
Real-time current balancing (±2% between modules)
Predictive failure alerts based on capacitor ESR drift
Remote soft-start sequencing to prevent inrush tripping
Energy consumption logging per I/O segment
Ultra-Low Noise Design: <25 mV output noise enables direct powering of sensitive analog modules (e.g., ABB AI825). EMI compliance exceeds CISPR 32 Class A by 10 dB, eliminating interference with HART® signals.
Explosion-Safe Construction: ATEX Zone 2 certification allows installation in hazardous areas without additional enclosures. Potting compound resists corrosive gases in refinery environments.
Scalable Power Architecture: Parallel up to 4 units (160A total) using ABB’s power busbar system. Automatic derating above 70°C prevents thermal shutdown.
Typical Application Scenarios
Nuclear Plant Safety Systems: Powers ABB SPDSI22 emergency shutdown chains. SIL 2 certification and seismic qualification (IEC 60980) ensure operation during earthquakes.
LNG Cryogenic Control: Maintains voltage stability at -40°C ambient in liquefaction trains. Fanless design prevents icing in cold boxes.
Offshore FPSO Power Distribution: ATEX compliance allows installation in classified zones. Withstands 5g vibration from compressor skids.
Pharmaceutical Batch Reactors: Powers SIL 2-rated interlocks. <1% current imbalance prevents ground loops in sensitive analog loops.
Data Center Backup Control: 300VDC input compatibility interfaces with UPS systems. Hot-swap enables maintenance during 24/7 operations.
Related Model Recommendations
ABB SDCS-POW-5: Next-gen 30A module with SIL 3 rating; upgrade path for SDCS-POW-4.
ABB HTTA-201: S+ I/O rack chassis; houses SDCS-POW-4 with integrated power bus.
ABB PFSK-142: Power distribution board; routes SDCS-POW-4 output to 32 I/O modules.
ABB DSTXW110: Termination board; receives protected power from SDCS-POW-4.
ABB CPS-1: Charger module; maintains SDCS-POW-4 backup supercapacitors.
ABB CI854: Communication interface; monitors SDCS-POW-4 via PROFIBUS.
Installation, Commissioning and Maintenance Instructions
Installation Preparation: Mount vertically with ≥50 mm side clearance. Verify input voltage stability (±10%). Use 6 AWG copper cables for input/output (torque 1.2 N·m). For redundancy:
Install identical modules in adjacent slots
Enable load sharing via jumper S1
Verify <5% current imbalance at full load
Maintenance Suggestions:
Quarterly: Clean heatsinks with dry air; check terminal tightness
Annually: Measure output ripple (<50 mVpp) with oscilloscope
Monitor MTBF counter in Control Builder MT – replace at 450,000 hours
Replace both modules in redundant pair after 5 years
Always use ABB-approved backup supercapacitors (BCP-48 series)
Service and Guarantee Commitment
ABB provides a 60-month warranty with lifetime technical support. Coverage includes:
Next-business-day advanced replacement for critical sites
On-site power quality audits by certified engineers
SIL 2 compliance documentation with FMEDA reports
24/7 access to ABB Ability™ Power Diagnostic Suite
Firmware updates with cybersecurity patches (IEC 62443-4-2 compliant)
15-year spare parts guarantee with traceable component history
All modules undergo 72-hour burn-in testing with thermal cycling. ATEX/IECEx certification files provided upon request.
