Allen-Bradley 1768-PA3 CompactLogix AC Power Supply Module
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SKU: 1768-PA3
Allen-Bradley 1768-PA3 CompactLogix AC Power Supply Module
The Allen-Bradley 1768-PA3 is a high-performance 120/240V AC power supply for 1768 CompactLogix controllers. It delivers stable backplane power to L4x series processors and up to eight 1769 I/O modules, featuring a 120VA capacity and integrated LED diagnostics for industrial automation reliability.
The Allen-Bradley 1768-PA3 serves as the primary power source for the 1768 CompactLogix system, providing essential DC power to the backplane. This module converts standard industrial AC or DC input voltages into the specific levels required by the controller and its associated modules. Because the 1768 series utilizes a high-performance architecture, this power supply is specifically keyed to support the L4x and L4xS controller families. It features an open-style design that allows for versatile mounting on either a DIN rail or a flat panel within an industrial enclosure.
Technical Capabilities and Performance
Manufacturer: Allen-Bradley / Rockwell Automation
Module Type: System Power Supply
Catalog Number: 1768-PA3
Input Voltage (AC): 85–265V AC (nominal 120/240V AC)
Input Voltage (DC): 108–132V DC
Frequency Range: 47–63 Hz
Power Consumption: 120VA or 120W (Maximum)
Backplane Output Current: Supports 1768 controllers and up to eight 1769 I/O modules
Power Supply Efficiency: 75% typical at full load
Enclosure Rating: Open-type (IP20)
Operating Temperature: 0° to 60° C (32° to 140° F)
Isolation Voltage: 250V (continuous), Reinforced Insulation Type
Operational Applications
Engineers implement the 1768-PA3 in automation cells that utilize the 1768-L43 or 1768-L45 motion controllers. This power supply is mandatory for configurations involving Sercos interface modules or high-speed Ethernet/IP modules that reside on the 1768 backplane. Since the unit supports a wide input voltage range, it performs reliably in global manufacturing environments where power standards fluctuate between 120V and 240V. Its ruggedized construction makes it suitable for heavy-duty process control and safety-integrated machinery.
Core Features
The module provides high-capacity current to the backplane to drive both the processor and local I/O expansion banks.
An integrated LED status indicator provides immediate visual feedback regarding power health and fault conditions.
Internal overcurrent protection includes a non-replaceable fuse to safeguard the entire system from electrical surges.
The 1768-PA3 supports the attachment of up to eight 1769 I/O modules, provided they stay within the power supply’s distance rating.
Advanced isolation barriers protect the logic circuitry from line-side transients and industrial noise.
Selective input jumpers or auto-ranging capabilities allow the supply to adapt to various field power sources without complex reconfiguration.
The Allen Bradley 1606-XLS240E, also cataloged as the 1606-XLS240E Performance Power Supply, operates as a dedicated hardware component for power conversion and voltage regulation within industrial control networks.
Hardware Specifications
Parameter
Specification
Model
1606-XLS240E
Brand
Allen Bradley
Origin
USA
Weight
0.9 kg
Dimensions
6 x 12.3 x 13 cm
Operating Temp
-25 deg C to 70 deg C
Power Consumption
240 W output rating
Profinet and EtherNet/IP Deterministic Networks
The power supply unit maintains stable backplane bus communication velocity and supports firmware flash compatibility across integrated automation nodes. Operating within deterministic network environments, the module delivers consistent DC voltage distribution while managing transient loads. High-speed switching topologies and low EMI emissions ensure that control data streams across connected Profinet and EtherNet/IP architectures remain uncorrupted by electrical noise.
Frequently Asked Questions
Q: What are the input voltage tolerances for this power supply model?A: The unit accepts standard industrial AC input ranges and incorporates built-in surge voltage protection limits to safeguard internal rectification circuits against grid anomalies.Q: How is thermal dissipation handled during maximum continuous load operations?A: Thermal management relies on natural convection cooling, requiring adequate vertical clearance above and below the housing to maintain specified operating temperature profiles without forced airflow.
Field Installation Guidelines
Mount the unit securely onto a standard DIN-rail inside the control cabinet, ensuring sufficient clearance for convection cooling airflow. Connect incoming AC mains and protective earth conductors to the designated terminals in accordance with local electrical safety codes. Verify output voltage at the screw terminals using a calibrated multimeter before connecting downstream PLC loads.
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