ABB 500CPU05 1MRB150081R1/E Central Processing Unit module

The ABB 500CPU05 (Part Number: 1MRB150081R1/E) is the "brain" or Central Processing Unit module for the REB500 busbar protection system.

 It is responsible for executing the protection algorithms, managing the logic of the entire rack, and coordinating data flow between input/output modules and communication interfaces.

Introduction

The 500CPU05 is a high-performance processor module designed to handle the complex mathematical calculations required for differential protection.

 In the ABB REB500 system architecture, this module evaluates the current measurements and status signals from all connected bays to determine if a busbar fault exists, initiating a trip command in milliseconds.

Technical Parameter Table

Product Advantages and Features

Ultra-Fast Tripping: Optimized for sub-cycle fault detection to minimize damage to substation primary equipment.

Logic Flexibility: Supports complex user-defined logic for interlocking and station-wide automation.

High Stability: Designed with advanced error-correction and watch-dog timers to prevent system freezes.

Hardware Revision /E: Features improved thermal management and updated component longevity compared to earlier revisions (A-D).

Centralized Management: Stores the entire station configuration, making it the single point of reference for the protection scheme.

Application Cases

Centralized Busbar Protection: Acts as the primary decision-maker in a centralized REB500 rack.

Fault Recording: Captures and stores disturbance records (oscillography) for post-fault analysis in major power grids.

Complex Interlocking: Manages the logic that prevents disconnectors from opening under load across multiple bays.

Large Scale Substations: Capable of managing up to 60 bays (depending on the overall system configuration).

Installation and Maintenance

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Installation

Slot Positioning: Must be installed in the designated CPU slot (usually Slot 1 or a specific central slot) as defined by the subrack manual.

Firmware Matching: Ensure the version /E hardware is compatible with the firmware version currently loaded in your PCM600 or CAP500 toolsets.

Handling: Use ESD protection. Ensure the backplane pins are straight before insertion to avoid short circuits.

Maintenance

Battery Backup: Check the internal battery (if applicable) or capacitor health periodically to ensure settings are retained during power loss.

Heat Dissipation: Ensure the subrack filters are clean; as the CPU generates the most heat in the rack, airflow is critical.

Backup: Always keep a fresh backup of the configuration file (.pcmp or .dat) before attempting to replace or upgrade this module.

Related & Other Models in the Same Series

Model    Description

500CUM05    Central Unit Management Module (often works alongside the CPU)

500CIM05    Communication Interface Module (The "Messenger")

500BIO01    Binary Input/Output interface for physical signals

500CPU03    Legacy CPU version (Older hardware generation)

500PSM05    Power Supply for the CPU and surrounding modules

Peer Tip: If you are replacing a 500CPU05. the revision suffix (/E) is vital. 

Swapping a revision /E into a system designed for /B without verifying software compatibility can sometimes lead to "Inconsistent Configuration" errors.