ABB 500CPU03 1HDF700003R5122 Central Processing Unit module

The ABB 500CPU03 (Part Number: 1HDF700003R5122) is a legacy high-performance Central Processing Unit module, 

primarily used in earlier generations of the ABB REB500 busbar protection system and specialized BIVECTOR drive controllers. 

This specific order code often refers to a combined configuration or a replacement unit that incorporates communication capabilities (like the 500PB101) into the CPU's processing logic.

Introduction

The 500CPU03 serves as the primary intelligence of the protection rack. 

Its role is to execute protection algorithms (like differential current calculations) and manage the system's internal bus communication.

The variant 1HDF700003R5122 is typically a hardware-software bundle designed for high stability in high-voltage environments, 

often pre-configured to handle Profibus (PB) or similar fieldbus data streams alongside its core protection tasks.

Technical Parameter Table

Product Advantages and Features

High-Speed Fault Processing: Designed for sub-cycle tripping, essential for protecting expensive busbar assets from thermal and mechanical stress.

Deterministic Logic: Unlike standard industrial PLCs, the 500CPU03 uses a deterministic operating system to ensure protection commands are never delayed by communication tasks.

Backward Compatibility: Specifically designed to maintain compatibility with older peripheral units (Bay Units) in the REB500 system.

Robust Self-Diagnostics: Features a "Watchdog" timer that monitors CPU health; if a hardware failure is detected, the module fails safe and alerts the SCADA system.

Integrated Communication Support: Capable of managing the 500PB101 Profibus stack directly, reducing the need for separate gateway hardware.

Application Cases

Legacy Substation Retrofits: Used to maintain or slightly upgrade existing REB500 installations where the primary wiring remains intact.

BIVECTOR Drive Control: Providing the high-speed computational power needed for vector control in large industrial motor drives.

Generator Protection: Coordinating various protection functions (Overcurrent, Differential, Earth Fault) in medium-sized power plants.

Distributed Protection Schemes: Acting as the central coordinator for multiple 500-series bay units scattered across a substation yard.

Installation and Maintenance

Installation

Slot Sensitivity: The 500CPU03 must be installed in the "Central Unit" master slot. Incorrect placement can prevent the system from booting.

Firmware Matching: Before installation, ensure the firmware version loaded on the CPU matches the configuration created in HMI500 or CAP500 software.

Connector Care: The high-density backplane connector is fragile. Ensure the module is level with the guide rails before applying pressure.

Maintenance

Battery Replacement: Check the internal lithium battery (if present on your sub-board revision) every 5–8 years to prevent losing the system's internal clock and event logs during power outages.

Thermal Inspection: Check for dust buildup on the processor's heat sink or onboard components. Excess heat is the leading cause of "CPU Stall" errors in older modules.

Configuration Backup: Always download the current parameter set to a PC before swapping modules, as the 500CPU03 stores the "Site Configuration."

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Related & Other Models in the Same Series

Model    Description

500CPU05    Modern successor to the 03 (higher clock speed)

500PB101    Profibus-DP Communication Module (often paired with this CPU)

500BOM01    Binary Output Module for trip execution

500PSM01    Power Supply for the 500-series rack

500CIM05    Modern Ethernet/IEC 61850 interface

Peer Note: If you are replacing a 500CPU03 with the R5122 revision, pay close attention to the Jumper settings on the side of the board.

 These jumpers often define the hardware address and baud rate for the internal communication bus.