ABB SD833 Power Supply Unit: Reliable 24V DC Power for Industrial Automation
When your control system demands a stable, efficient, and safe power source, the ABB SD833 Power Supply Unit delivers. Designed for both non-redundant and redundant applications, this switch-mode PSU converts mains voltage to 24 volts DC with a rated output current of 10 A and rated output power of 240 W. Its auto-select input (100-120 V a.c. or 200-240 V a.c.) simplifies installation and reduces inventory costs—you no longer need separate units for different mains voltages.
Technical Specifications: Performance That Saves You Money
Key parameters of the SD833 directly impact your operational costs:
- Rated Output Current: 10 A – sufficient for powering multiple I/O modules, sensors, and actuators without derating.
- Rated Output Power: 240 W – provides ample headroom for typical control cabinets.
- Efficiency: 91/91.6 % – higher efficiency means less energy wasted as heat, lowering your electricity bills and reducing cooling requirements.
- Heat Dissipation: 24/22 W – minimal thermal load on your enclosure, extending the life of nearby components.
- Output Voltage Regulation at Max. Current: < 70 mV / <100 mV – tight regulation ensures consistent voltage to sensitive electronics, preventing erratic behavior and downtime.
- Ripple (Peak to Peak): < 50 mV – clean DC output reduces noise interference, improving measurement accuracy.
- Primary Peak Inrush Current at Power On: <10 A – soft start feature prevents nuisance tripping of fuses or earth-fault circuit breakers, saving troubleshooting time.
These specs translate directly into cost savings: lower energy consumption, reduced cooling needs, fewer nuisance trips, and longer equipment life.
Industry Applications: Where the SD833 Excels
The SD833 is ideal for:
- Automotive Assembly Lines: Powering PLCs, remote I/O, and actuators in harsh factory environments. Its IP20 protection rating and compliance with IEC 61131-2 ensure reliable operation alongside standard industrial controllers.
- Water Treatment Plants: Supplying 24V DC to sensors, valves, and SCADA systems. The SELV/PELV approval means safe low-voltage operation even in wet or corrosive atmospheres (ISA-S71.04 G2).
- Material Handling Systems: Redundant power configurations using diode voting units SS823 or SS832 provide fault-tolerant power for critical conveyors and sorters, minimizing costly downtime.
Installation & Setup Guidance: Simple DIN-Rail Mounting
Mounting the SD833 is straightforward:
- Mounting: Snap onto a standard DIN rail. Allow 15 mm (0.59") spacing horizontally and 40 mm (1.57") vertically for ventilation.
- Wiring: Connect mains input (auto-select) to terminals L, N, and PE. Output is 24V DC (SELV/PELV). No external mains filter is required.
- Soft Start: Power-on will not trip fuses or earth-fault breakers, simplifying commissioning.
- Redundant Systems: For N+1 redundancy, add diode voting units SS823 or SS832.
Maintenance & Reliability: Long-Term Cost Efficiency
The SD833 requires minimal maintenance:
- Inspect Annually: Check for dust accumulation on ventilation slots; clean with a dry, low-pressure air stream.
- Verify Output Voltage: Measure at the load terminals to ensure regulation remains within <70 mV at max current.
- Monitor Ambient Temperature: Maximum ambient is 55 °C; above 45 °C, derate output current to 12 A max.
- Environmental Ratings: IP20, pollution degree 2, and corrosive atmosphere class G2 ensure long life in typical industrial settings.
By following these simple steps, you maximize uptime and avoid premature replacement costs.
Compatibility & Integration
The SD833 integrates seamlessly with ABB AC500, AC800M, and other 24V DC control systems. It also works with any brand of PLC, DCS, or I/O that accepts 24V DC power. The auto-select input makes it compatible with worldwide mains voltages (100-120 V a.c. or 200-240 V a.c., ±10%).
Selection Guide & Purchasing Advice
Before ordering, verify:
- Input Voltage: Your facility's mains matches the auto-select range.
- Output Current: Total load current does not exceed 10 A (or 12 A below 45 °C).
- Redundancy Needs: If required, order diode voting units SS823 or SS832 separately.
- Lifecycle Status: Please verify current lifecycle status and availability with SpareTechPLC before ordering.
SpareTechPLC stocks the ABB SD833 (3BSC610066R1) and offers competitive pricing, fast shipping, and expert support.
Troubleshooting & Common Issues
- No Output: Check input fuse (recommended external fuse 10-20 A primary side). Verify mains voltage is within range.
- Output Overvoltage: The unit protects against overvoltage (<39 V); if triggered, cycle input power.
- Overheating: Ensure ambient temperature is below 55 °C and ventilation spacing is maintained.
- Short Circuit: Output short-circuit protection activates at 14-18 A; remove fault and restart.
Frequently Asked Questions
Q: Can the SD833 be used for redundant power supplies?
A: Yes, for redundant applications, you need external diode voting units SS823 or SS832. The SD833 itself supports parallel operation when combined with these modules.
Q: What certifications does the SD833 hold?
A: It carries CE mark, complies with IEC 61131-2, UL 508, and EN 50178. It also has marine certification from DNV-GL and ABS.
Q: Does the SD833 require an external mains filter?
A: No, the SD833 does not require a mains filter. Its built-in EMC compliance (EN 61000-6-4 and EN 61000-6-2) ensures low conducted and radiated emissions.
Q: What is the holdup time during a mains blackout?
A: The secondary voltage holdup time is 46/47 ms, providing enough time for controlled shutdown or transfer to backup power.
Q: Is the SD833 suitable for use in hazardous locations?
A: No, it is not certified for ATEX Zone 2, IECEx Zone 2, or Class 1 Div 2 hazardous locations. It is designed for general industrial environments.
