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The ABB SD834 is a high-efficiency, 480W switching power supply module designed specifically for ABB's AC 800M controller systems and S800 I/O distributed I/O systems. As a critical component in ABB's System 800xA automation platform, the SD834 provides reliable, regulated 24V DC power with advanced features including soft-start capability, wide input voltage range, and redundant configuration support .

The ABB SD834 serves as the primary power source for AC 800M processor units, communication interfaces, and S800 I/O modules in demanding industrial automation applications. The SD834 can be deployed in both non-redundant single-supply configurations and N+1 redundant architectures using ABB's SS823 or SS832 voting units, ensuring maximum system availability for critical control applications .

Model Number SD834 (3BSC610067R1)

Product Type Switch-Mode Power Supply Unit

Input Voltage Range 100–240V AC (47–63 Hz) / 110–300V DC

Rated Output 24V DC ±1% (20A continuous, 480W)

Peak Current 25A (≤5 seconds)

Efficiency 93% @ full load (AC input)

Holdup Time 230V/20A: 36ms min (51ms typ)

Isolation Strength 2500V AC (input-output)

Overvoltage Protection Auto-cutoff >37V

Output Voltage Regulation<10 mV / <100 mV

Ripple<100 mV

Operating Temperature -20°C to +55°C (derate 2%/°C >40°C)

Cooling Method Natural convection (10mm clearance required)

Protection Rating IP20 (control cabinet installation)

MTBF 500,000 hours (IEC 61709)

Redundancy Support Via SS823/SS832 voting unit (N+1 architecture)

Dimensions 127 × 124 × 82 mm (L × H × W)

Weight 1.35 kg (1.2 kg net)

Compliance Standards EN 50178, UL 508, IEC 61131-2, EN 60664-1, ISA-S71.04 G2

The SD834 offers extensive functionality for industrial power supply applications:

High Efficiency Operation: 93% efficiency at full load reduces energy consumption and heat generation, contributing to lower operational costs and extended component life

Wide Input Range: Accepts both AC (100-240V) and DC (110-300V) inputs, providing flexibility for global deployment and battery-backed installations

Soft-Start Capability: Controlled power-on prevents nuisance tripping of upstream fuses or earth-fault circuit breakers during startup—no external mains filter required

SELV/PELV Compliance: Secondary output circuitry meets Safety Extra-Low Voltage (SELV) and Protected Extra-Low Voltage (PELV) requirements per EN 50178

Redundancy Ready: Designed for N+1 redundant configurations when paired with SS823 or SS832 voting units, providing automatic failover for critical applications

Natural Convection Cooling: Fanless design eliminates moving parts, enhancing reliability and reducing maintenance; requires only 10mm clearance for airflow

Comprehensive Protection: Overvoltage protection (>37V auto-cutoff), overload protection, and short-circuit protection ensure safe operation and protect downstream equipment 

Configuration Steps

Mounting Installation: Mount ABB SD834 horizontally on standard 35mm DIN rail (NS 35/7.5 per EN 50022) in clean, dry control cabinet environment. Ensure 10mm clearance above and below for natural convection cooling

Input Connection: Connect 100-240V AC (47-63 Hz) or 110-300V DC to input terminals with appropriate wire sizing and fuse protection per local electrical codes

Output Configuration: Configure 24V DC output for AC 800M controller and S800 I/O power requirements. Maximum continuous output: 20A (480W)

Redundancy Setup (if applicable): For redundant operation, connect two SD834 units to SS823 or SS832 voting unit. Connect voting unit output to common load distribution

Status Monitoring: Connect SA/SB supervision signals to AC 800M diagnostic inputs for remote monitoring of power supply health and redundancy status

Daily Operation

Monitor SD834 operation via status LEDs (if equipped) or through AC 800M system diagnostics

Verify output voltage stability at 24V DC ±1% under varying load conditions

For redundant configurations, monitor voting unit status to ensure both power supplies operational

Review system event logs for any power supply alarms or switchover events

DIN Rail Mounting: Snap SD834 horizontally onto 35mm DIN rail ensuring secure retention and proper grounding through rail connection. The unit must be mounted horizontally for proper thermal management

Input Wiring:

AC Input: Connect L, N, and PE terminals with appropriate wire size (minimum per local code)

DC Input: Connect + and - terminals observing correct polarity

Output Wiring: Connect 24V DC output (+24V, 0V) to load distribution terminals. Use adequate wire sizing for 20A continuous current

Redundant Configuration (if applicable):

Install two SD834 units

Connect outputs to SS823 (up to 10A) or SS832 (up to 20A) voting unit

Connect voting unit output to AC 800M and S800 I/O power distribution

Wire SA/SB supervision signals to processor unit for fault detection

Grounding: Ensure PE terminal connected to control cabinet earth bar for safety and EMC compliance

Pre-Energization Checks

Verify all terminal connections for tightness and correct polarity

Confirm input voltage within 100-240V AC or 110-300V DC range

Check that load current will not exceed 20A continuous (25A peak ≤5s)

Validate 10mm clearance above and below unit for airflow

For redundant systems, verify both SD834 units and voting unit properly wired 

Initial Power-Up: Apply input power and verify output voltage at 24V DC ±1%

Load Testing: Gradually apply load while monitoring output voltage stability and thermal performance

Redundancy Testing (if applicable):

Simulate primary power supply failure by disconnecting one SD834

Verify seamless transfer to standby supply via voting unit

Confirm SA/SB alarm signals generated and received by AC 800M

Restore primary supply and verify automatic return to normal operation

Holdup Time Verification: Verify minimum 36ms holdup time at full load (230V AC input) to ensure ride-through of brief power interruptions

Documentation: Record final configuration, output voltage measurements, and redundancy test results

Routine Inspection (Quarterly)

Inspect ABB SD834 for dust accumulation; clean with dry compressed air if necessary—maintain natural convection airflow paths

Verify all terminal connections remain tight and free from corrosion

Check for abnormal heating or discoloration of casing

Monitor output voltage via system diagnostics for drift beyond ±1%

Annual Maintenance

Verify output voltage regulation (<10 mV / <100 mV) and ripple (<100 mV) specifications

Test overvoltage protection by simulated fault (if safe test method available)

For redundant systems, test automatic switchover functionality

Update firmware if applicable (via AC 800M system updates)

Verify holdup time meets specification (36ms min, 51ms typ at 230V/20A)

Long-Term Maintenance

MTBF Based: With 500,000-hour MTBF, plan replacement based on operational hours and environmental conditions

Capacitor Life: Fanless design extends electrolytic capacitor life; however, consider replacement after 5-7 years in high-temperature environments

No Battery Required: Settings stored in non-volatile memory; no battery backup needed

Redundancy Maintenance: For N+1 configurations, replace one SD834 at a time while system operates on remaining supply

Condition Monitoring

The SD834 provides monitoring capabilities:

Output voltage monitoring via system diagnostics

SA/SB status signals for redundancy supervision (when used with voting units)

Thermal monitoring through cabinet temperature sensors

Load current estimation via AC 800M power consumption calculations

Event logging of power supply alarms and switchover events

Electrical Safety: The SD834 operates at mains voltage (100-240V AC) on input and SELV (24V DC) on output. Qualified personnel must perform installation and maintenance

SELV/PELV Compliance: Output meets Safety Extra-Low Voltage requirements; suitable for direct connection to AC 800M and S800 I/O without additional isolation in most configurations

EMC Compliance: No external mains filter required; meets EMC Directive for industrial environments. Maintain proper grounding and shielding practices

Thermal Management: Natural convection cooling requires 10mm clearance; do not obstruct ventilation slots or install in sealed enclosures without airflow

Redundancy Safety: SS823/SS832 voting units provide decoupling between redundant SD834 units; ensure proper wiring to prevent back-feeding

Overvoltage Protection: Auto-cutoff at >37V protects downstream equipment; unit automatically recovers when fault cleared