A-B 1768-PB3 CompactLogix Power Supply Module

Product Overview

Core Electrical Specifications

Input Parameters

• Input type: Wide-range DC input
• Input voltage range: 16.8–31.2 VDC (nominal 24VDC)Rockwell Automation
• Max input power: 112 W
• Max inrush current: 50 A
• Typical efficiency: 80% @ 24VDC full load

Output Capacity

1. Backplane 24VDC power: 3.5 A continuous (90 W total system power)
2. Front-panel auxiliary 24VDC terminal: 0.25 A (6 W) for small field sensors/indicators
3. Hold-up time: ≥5 ms at full load, maintains system operation during brief DC bus dips
4. Built-in multi-layer protection: Overvoltage (OVP), overcurrent (OCP), short-circuit auto-shutdown, thermal cut-off

Isolation & Safety

• Input-to-backplane insulation: Basic insulation 150V rated
• Built-in internal fuse for circuit fault isolation
• Compliance: UL/cUL, CE industrial certification

Mechanical & Environmental

• Mounting: Standard 35mm DIN rail horizontal installation
• Dimension (H×W×D): 118 × 70 × 87 mm
• Net weight: ~630 g
• Enclosure: Open vented metal housing, IP20 (must install inside control cabinet)
• Operating temperature: 0 ℃ ~ +60 ℃
• Storage temperature: -40 ℃ ~ +85 ℃
• Humidity: 5%–95% non-condensing
• Status indicators: Power OK, fault diagnostic LED on front panel

Compatibility

• Main system: All 1768 CompactLogix L43/L45/L48 controllers
• Expansion I/O: Powers all 1769 digital/analog/relay I/O expansion racks connected via expansion cables
• System rule: A 1768 controller must be installed on the rack to activate power supply outputRockwell Automation

Main Functions

1. Full Rack Backplane Power Distribution

    

   Deliver stabilized 24VDC power to the 1768 CPU, communication modules, and all connected 1769 remote/local I/O modules, providing core operating power for the entire CompactLogix automation system.
2. Auxiliary 24VDC Field Power Tap

    

   Front terminal block provides low-current 24VDC output for powering proximity sensors, small indicator lights without an extra standalone power supply.
3. Power Failure & Fault Diagnosis

    

   LED status light displays normal operation, overheating, short-circuit or input under-voltage faults; system triggers PLC fault alarms when power supply abnormality occurs.
4. Transient Voltage Stabilization

    

   Suppress DC bus voltage fluctuations from battery power, UPS or DC power cabinets, ensuring stable CPU and I/O operation without scan dropouts or module resets.
5. System Power Hold-Up Support

    

   5ms minimum hold-up time avoids sudden PLC program crash during brief power flicker, protecting production data and process logic.
6. Modular Rack Hot-Swap Maintenance

    

   Standard rack slot design allows independent replacement of power supply without removing all I/O wiring (system shutdown required for replacement).

Key Advantages

• DC-only input design matches battery/UPS powered industrial sites, mobile machinery and vehicle-mounted control panels
• Compact single-slot rack form factor saves cabinet space vs separate external power supplies
• Built-in auxiliary 0.25A 24V output reduces auxiliary power supply quantity for small machine control
• Wide 16.8–31.2VDC input tolerates voltage drift of industrial DC bus systems
• Integrated complete overcurrent/short-circuit/thermal protection to safeguard expensive PLC and I/O modules
• Unified 1768 rack architecture, plug-and-play installation with no extra wiring adapters
• Direct replacement spare for legacy 1768 L4x equipment retrofits and maintenance

Typical Applications

• Mobile machinery control panels (battery 24VDC powered)
• UPS-backed critical process control skids (water treatment, chemical batch systems)
• Packaging, injection molding small machine CompactLogix control racks
• Material handling conveyor DC-powered automation cabinets
• Mining, off-road equipment 24V DC bus PLC systems
• Factory equipment retrofit of discontinued 1768 CompactLogix platforms