Allen-Bradley 1756-PSCA2 ControlLogix Redundant Power Supply Chassis Adapter

Technical Specifications Breakdown

Key parameters for the 1756-PSCA2 are listed below for quick reference:

Industry Applications

This component is essential in process industries where power redundancy is mandatory. In oil and gas refineries, a single power supply failure could stop a distributed control system, risking safety and production. The 1756-PSCA2 allows engineers to build a redundant power system using two 1756-PA75R or 1756-PB75R supplies, minimizing unplanned downtime. Similarly, in water treatment plants, continuous operation is critical for meeting environmental regulations. By funneling power from redundant supplies, the adapter ensures the ControlLogix chassis remains powered even during supply maintenance.

Installation & Setup Guidance

Mount the 1756-PSCA2 horizontally on the left side of the chassis. Connect it to the power supply using a 1756-CPR2 cable, which has a bend radius of 5 inches (12.7 cm). Ensure at least this clearance for proper routing. Ground the device according to the application's grounding requirements. Some applications may need an additional protective earth-ground terminal stud to link the chassis to the ground bus. Keep wire lengths as short as possible to minimize resistance.

Maintenance & Reliability

As an open-type passive device, the 1756-PSCA2 requires minimal maintenance. Inspect the unit periodically for dust accumulation or loose connections. Operate within the specified temperature range of 32-140 Fahrenheit (0-60 Celsius) to ensure reliable performance. The module dissipates up to 25.7 Watts at 30 Celsius, so ensure adequate ventilation around the chassis.

Ensuring Uptime with Redundant Power

In critical industrial automation, a single power supply failure can halt production lines, causing costly downtime. The Allen-Bradley 1756-PSCA2 ControlLogix Redundant Power Supply Chassis Adapter solves this challenge by enabling a redundant power architecture. This passive device funnels power from one or two redundant power supplies into the single power connector on the chassis backplane, ensuring continuous operation even if one supply fails.

Compatibility & Integration

The 1756-PSCA2 is compatible with Bulletin 1756-PA75R and 1756-PB75R power supplies. The module comes with an Ex nA IIC T4 Gc protection type per EN 60079-15 and IECEx UL 14.0008X Hazardous Location Certificate, making it suitable for use in certain hazardous environments.

Selection Guide & Purchasing Advice

When building a redundant power system, verify that your chassis is a Standard Series B model. Only one 1756-PSCA2 is required per system. AutoDCSTech stocks this adapter and can confirm current lifecycle status and availability before ordering.