ABB SD831

The SD831 is part of a broader power supply family (including SD832, SD833, and SD834), offering scalability for different current requirements while maintaining a unified footprint and electrical interface.

Technical Specifications

The specifications below define the electrical and physical parameters of the standard SD831 module configuration:

• Input Voltage Range:
  • AC: 100–240 V AC (±10% tolerance).
  • DC: 110–300 V DC (-20% / +25% tolerance).
• Output Specifications:
  • Voltage: 24 V DC (regulated).
  • Current: 3 A (maximum continuous).
  • Power: 72 W (at 24V/3A).
• Electrical Performance:
  • Ripple and Noise: < 50 mV peak-to-peak (typical).
  • Efficiency: > 88% (typical at full load).
  • Hold-up Time: 29 ms (AC input) to 120 ms (DC input) to maintain output during power loss.
  • Inrush Current: < 28 A (AC) / < 54 A (DC) at cold start.
• Physical Characteristics:
  • Dimensions: 32 mm (Width) x 102 mm (Depth) x 124 mm (Height).
  • Weight: Approximately 430 grams.
  • Mounting: 35 mm DIN rail (EN 60715 standard).
  • Cooling: Natural convection (no fan required), allowing for dense packing in control cabinets.
• Environmental Parameters:
  • Operating Temperature: -25°C to +70°C (derating required above 60°C).
  • Protection Class: IP20 (finger-safe).
  • Certifications: CE, UL 508, IEC 61131-2, EN 50178, cULus.
• Protection Features:
  • Overload Protection (OL).
  • Overvoltage Protection (OVP).
  • Overtemperature Protection (OTP).
  • Short Circuit Protection (automatic recovery/hiccup mode).

Functional Features

• Wide Input Flexibility: The module accepts a broad spectrum of input sources (100-240V AC or 110-300V DC), making it adaptable to global power grids and unstable industrial power environments without requiring external transformers.
• High Reliability and Redundancy:
  • The SD831 can be paired with the SS822 Voting Module to create a hot-swappable redundant power system. If one SD831 fails, the other takes over immediately without interrupting the CPU or field devices.
  • Supports RNRP (Redundant Network Routing Protocol), enabling fast detection of network faults and immediate traffic redirection to ensure communication stability.
• Advanced Diagnostics and Monitoring:
  • Equipped with LED status indicators (Green for normal, Amber for overload, Red for overtemperature).
  • Includes a monitoring relay for remote alarm signaling to the control system.
  • Allows for real-time health monitoring of the power supply status.
• Robust Industrial Design:
  • Designed to withstand high vibration, shock, and electromagnetic interference (EMI) typical in heavy industry.
  • The sealed construction protects internal electronics from dust and conductive contaminants.
  • No moving parts (fanless design) significantly increases Mean Time Between Failures (MTBF).
• Efficient Thermal Management: Even at full load, the module’s internal temperature rise is kept below 25 K, ensuring long-term component stability without the need for external cooling gaps or forced air.

Application Scenarios

The ABB SD831 is deployed across a wide spectrum of industrial sectors where power stability is paramount:

• Process Control and DCS Systems:
  • Primary power source for ABB Freelance, System 800xA, and AC 800M controller cabinets.
  • Powers distributed I/O racks (e.g., S800 I/O series) in chemical plants, refineries, and pulp & paper mills.
• PLC and Automation:
  • Provides 24V DC to CPUs and expansion modules in ABB Advant controllers and PLCs.
  • Used in OEM (Original Equipment Manufacturer) skids and machine control panels where space is limited.
• Critical Infrastructure:
  • Power Generation: Turbine control systems, generator excitation, and substation automation.
  • Oil & Gas: Offshore platforms (handling bridge generator conversions), pipeline monitoring, and drilling rig control systems.
  • Water/Wastewater: Pumping stations, filtration control, and desalination plants.
• Specialized Environments:
  • Marine and Transportation: Shipboard power management systems where voltage fluctuations are common.
  • Pharmaceuticals and Food: Applications requiring high hygiene standards where fan-cooled supplies are prohibited to prevent dust circulation.
• Infrastructure and Building Automation:
  • HVAC control systems, security access control, and fire alarm panels requiring high availability.