The Allen-Bradley 1756-PSCA2 is a ControlLogix redundant power supply chassis adapter module engineered to enhance system uptime by enabling redundant power configurations. This passive interface module routes electrical power from one or two remotely mounted ControlLogix redundant power supplies directly into the backplane of a ControlLogix chassis.

Features

• Passive power distribution interface for high-reliability applications.
• Enables redundant power supply configurations using 1756-PA75R/A or 1756-PB75R/A power supplies.
• Supports automatic load sharing between dual power sources.
• Facilitates seamless failover protection; if one power supply fails, the remaining unit maintains the full chassis load.
• Designed for left-side mounting on standard ControlLogix chassis.

Applications

This adapter is essential for critical industrial control processes where power supply failure cannot result in system downtime. Typical applications include:

• Oil, gas, and petrochemical processing systems.
• Water and wastewater treatment facility control.
• Food and beverage production and mixing lines.
• Power generation and utility infrastructure management.

Technical Specifications

Installation Guidelines

• Ensure the ControlLogix chassis is properly grounded before installing the module.
• The 1756-PSCA2 must be installed in the designated power supply slot on the far left side of the chassis.
• Align the module circuit board with the chassis card guides and slide it in until it is flush with the front of the chassis.
• Secure the module by tightening the top and bottom retaining screws to ensure a solid electrical connection to the backplane.
• Use only compatible 1756-CPR2 cable assemblies for connecting the remote power supplies.
• Always power down the system before inserting or removing modules to prevent electrical arcing or damage to backplane pins.

FAQ

What is the primary purpose of the 1756-PSCA2?

It acts as a bridge to allow two remotely mounted, redundant power supplies to provide power to a single ControlLogix chassis, ensuring continuous operation during a power supply failure.

Can I mix AC and DC power supplies with this adapter?

Yes, the 1756-PSCA2 is designed to support both 1756-PA75R/A (AC) and 1756-PB75R/A (DC) power supplies in redundant configurations.

Does the module require external power?

No, the 1756-PSCA2 is a passive device. It receives power from the connected external power supplies and routes it to the chassis backplane.