Allen-Bradley 1756-CPR Redundant Power Supply Cable

The Allen-Bradley 1756-CPR, also cataloged as the 1756-CPR redundant power supply cable, serves as the primary power redundancy interconnect assembly utilized to execute failover power distribution across ControlLogix 1756 chassis architectures. It provides direct electrical linkage between dual redundant power supplies to maintain continuous backplane energization during supply transition events.

Suffix Breakdown & Model Matrix

• Base model: 1756-CPR redundant power supply cable

• No functional suffix segmentation is defined beyond core model designation

• Assembly is fixed-length variant family depending on production configuration

Hardware Specifications

Backplane Bus Power Redundancy and EtherNet/IP Control Continuity

The cable implements a direct DC/AC supervisory linkage between redundant 1756 power supply modules without signal processing or protocol conversion. Failover coordination is executed through supply-side detection logic, ensuring uninterrupted backplane voltage regulation.

Power continuity behavior is governed by supply internal switching logic, while the interconnect cable maintains reference synchronization between primary and backup modules. No buffering or isolation circuitry is embedded within the cable assembly.

Mechanical routing constraints ensure low impedance continuity across redundant supply terminals, supporting stable chassis backplane energization during dynamic load transfer conditions.

Frequently Asked Questions (FAQ)

Q: Does the 1756-CPR contain active electronics for power management?
A: No. The cable is a passive interconnect without signal conditioning or switching components.

Q: Is power transfer between redundant supplies handled inside the cable?
A: No. Switching logic resides within the redundant power supply modules, not the cable assembly.

Q: Can the cable be replaced while the system is energized?
A: No. Replacement requires controlled shutdown to avoid interruption of redundant supply synchronization.

Field Installation Guidelines

Install the cable only inside a fully enclosed ControlLogix 1756 chassis cabinet. Ensure both redundant power supply connectors are fully seated to maintain stable inter-module synchronization.

Route the cable away from high-frequency switching conductors and motor power lines to minimize induced coupling into the redundant supply control paths. Maintain consistent cabinet grounding and shielding continuity.

Verify compatibility between paired redundant supplies before energization. Confirm correct primary/backup assignment and perform controlled power cycling tests during commissioning.