1. Basic Information

ABB SA168 (Part No. 3BSE003389R1) is a high-power industrial switching power supply unit dedicated for ABB Advant OCS / AC450 DCS control systems. As the core power supply device for complete ABB AC450 DCS systems, it converts industrial 230V AC to stable 24V DC power, providing high-power, low-ripple and high-purity power for system controllers, CPU cards, I/O modules, communication units and field auxiliary equipment. It is an essential basic unit to ensure long-term uninterrupted operation of large-scale ABB DCS control systems.

2. Technical Specifications

2.1 Core Input Electrical Parameters

• Input Voltage: Single-phase AC 230V standard industrial mains
• Voltage Fluctuation Range: AC 207V～253V (±10% wide tolerance) for industrial grid fluctuation adaptation
• Input Frequency: 50Hz/60Hz universal industrial frequency, automatic adaptation without code setting
• Input Characteristics: Built-in EMI filter circuit to suppress grid clutter, surge and high-frequency interference and purify input power quality
• Power-on Mode: Soft-start mechanism to eliminate instantaneous inrush current and protect backend cards and controllers

2.2 Core Output Electrical Parameters

• Output Voltage: Stable DC 24V industrial standard voltage, compatible with full series ABB DCS cards and industrial equipment
• Rated Output Current: 25A super-large continuous output current, meeting high-power centralized power supply demand of high-density I/O cabinets
• Voltage Regulation Accuracy: Minimal voltage drift under no-load, half-load and full-load conditions with high stability
• Output Ripple: Ultra-low ripple output, avoiding signal drift, inaccurate sampling and communication error of weak-current cards
• Conversion Efficiency: High-efficiency high-frequency switching design with low power consumption and low heat generation for stable long-term full-load operation

2.3 Protection & Diagnosis Specifications

• Multi-hardware Protection: Integrated over-voltage, under-voltage, over-current, short-circuit and over-temperature self-locking protection to cut off output instantly and protect backend control systems
• Overload Fault Tolerance: Reasonable short-time overload capacity to adapt to transient load fluctuation and simultaneous multi-module power-on impact
• Fault Self-recovery: Automatic reset for minor transient faults and self-locking for severe faults to avoid repeated equipment impact
• Status Indication: Built-in operation and fault indicator lights for intuitive working status judgment and convenient operation and maintenance

2.4 Environmental & Physical Specifications

• Operating Temperature: -20℃～+60℃ industrial wide temperature range, adapting to closed high-temperature and low-temperature cabinet conditions
• Storage Temperature: -40℃～+85℃ with excellent temperature shock resistance and anti-aging performance
• Humidity Range: 5%～95%RH (non-condensing), dust-proof and moisture-proof for high-humidity cabinet environments
• Protection Grade: IP20, suitable for standard industrial control cabinet closed installation
• EMC Performance: Compliant with industrial EMC standards with strong resistance to frequency conversion interference, electromagnetic radiation and ground crosstalk
• Installation Mode: Standard rack mounting, compatible with original ABB DCS cabinet layout, stable and anti-vibration
• Dimensions & Weight: 482mm×177mm×255mm (W×H×D), weight 26.6kg

2.5 Certification & Compatibility Specifications

• Certification: CE, UL, RoHS industrial compliance certifications, meeting international industrial equipment safety standards
• System Compatibility: Fully compatible with ABB Advant Controller 450 (AC450) complete DCS control system
• Device Adaptation: Supports centralized power supply for ABB full-series DCS CPU cards, AI/AO/DI/DO signal cards, communication cards and relay modules

3. Working Principle

1. Input Filtering & Soft Start: The input 230V AC is purified by the built-in EMI filter circuit to eliminate grid clutter and surge interference. The soft-start circuit gently builds up input voltage to avoid instantaneous inrush current impact on backend equipment.
2. High-frequency Rectification & Conversion: The purified AC power enters the high-frequency switching inverter loop, completing rectification, voltage transformation and high-frequency conversion to convert high-voltage AC to low-voltage DC bus power via efficient energy conversion.
3. Precise Voltage Regulation & Ripple Suppression: The closed-loop voltage regulation algorithm corrects output voltage deviation in real time. Multi-stage high and low-frequency filtering circuits eliminate switching ripples and noise to output pure and stable 24V DC power.
4. High-power Constant Output: It continuously outputs power at 25A rated current to supply stable uninterrupted power for cabinet controllers, various I/O cards, communication modules and relay loops, meeting high-density multi-device simultaneous operation load demands.
5. Real-time Monitoring & Protection: The module continuously monitors core parameters such as output voltage, load current and internal temperature. Once abnormalities including over-voltage, under-voltage, over-current, short-circuit and over-temperature are detected, it triggers hardware self-locking protection, cuts off output and lights the fault indicator to prevent large-area damage of backend DCS equipment.
6. Fault Reset & Self-healing Operation: Minor transient faults can be automatically reset to resume normal power supply after elimination; permanent faults remain self-locked to prevent repeated start-stop impact and ensure controllable safety of the entire DCS system.

4. Application Scenarios

4.1 Dedicated Power Supply for ABB AC450 DCS System

4.2 Centralized Power Supply for Large Process Industry Cabinets

4.3 Redundant Power Supply System for Key Industrial Control Equipment

4.4 Renovation & Replacement of Old DCS System Power Supplies