ABB KRAFT-G/CAD Series Modules

Technical Dossier

Product Details And Specifications

ABB KRAFT-G/CAD Series: Comprehensive Module Range and Technical Overview

The ABB KRAFT-G/CAD series represents a core control board family deployed within ABB's industrial drive and process automation platforms. These boards are installed across heavy-process industries including petrochemical refineries, pulp and paper mills, nuclear auxiliary systems, and offshore oil and gas platforms. The KRAFT-G/CAD designation covers a range of control, regulation, and interface boards designed for integration into ABB drive cabinets and distributed control architectures. Their long service life and robust design have made them a critical spare parts category for facilities operating legacy ABB drive systems well beyond the original product lifecycle.

The Evolution of KRAFT-G/CAD Architecture

The KRAFT-G/CAD board family was developed as part of ABB's modular drive control philosophy, enabling standardized regulation and interface functions across multiple drive platform generations. Early variants were designed for analog regulation tasks within thyristor-based DC drive systems, providing speed and current reference processing. As ABB's drive platforms evolved through the 1980s and 1990s, the KRAFT-G/CAD series was extended to cover digital interface functions, pulse encoder feedback processing, and fieldbus communication bridging.

Compatibility across generations is a known engineering constraint: KRAFT-G/CAD boards are typically tied to specific drive cabinet revisions and backplane bus standards. Cross-generation substitution requires verification of connector pinout, firmware revision, and reference voltage compatibility. Many KRAFT-G/CAD variants are now classified as End-of-Life (EOL) by ABB, with no active production. Facilities relying on these boards must source from certified aftermarket suppliers or maintain dedicated spare pools.

KRAFT-G/CAD Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ABB KRAFT-G/CAD control board family, organized by functional category:

Regulation & Control Boards

KRAFT-G/CAD-645: Main regulation control board for ABB DC drive systems
KRAFT-G/CAD-640: Speed regulation board, analog reference input processing
KRAFT-G/CAD-641: Current regulation board, thyristor firing angle control
KRAFT-G/CAD-642: Dual-channel regulation board for reversing drive configurations
KRAFT-G/CAD-643: Field current regulation board, excitation control
KRAFT-G/CAD-644: Auxiliary regulation board, supplementary control loop interface

Interface & Signal Conditioning Boards

KRAFT-G/CAD-650: Analog I/O interface board, signal scaling and isolation
KRAFT-G/CAD-651: Digital I/O interface board, 24VDC logic level conversion
KRAFT-G/CAD-652: Pulse encoder interface board, incremental encoder feedback
KRAFT-G/CAD-653: Tachometer interface board, analog speed feedback conditioning
KRAFT-G/CAD-654: Reference input board, setpoint scaling and filtering

Communication & Fieldbus Boards

KRAFT-G/CAD-660: Serial communication adapter board, RS-232/RS-485 interface
KRAFT-G/CAD-661: Profibus DP adapter board, fieldbus node interface
KRAFT-G/CAD-662: Modbus RTU communication board, master/slave configuration
KRAFT-G/CAD-663: DeviceNet adapter board, CAN-based network interface

Power Supply & Auxiliary Boards

KRAFT-G/CAD-670: Auxiliary power supply board, internal 24VDC regulation
KRAFT-G/CAD-671: Backplane power distribution board, multi-rail output

Sourcing Hard-to-Find & Obsolete KRAFT-G/CAD Parts

The majority of KRAFT-G/CAD series boards have been discontinued by ABB. Standard OEM channels no longer stock these components, and lead times through authorized distributors — when available — can exceed 26 weeks. DriveKNMS maintains a dedicated inventory of KRAFT-G/CAD spare boards sourced from decommissioned drive systems, controlled storage facilities, and verified aftermarket channels.

For end-users operating ABB drive systems with KRAFT-G/CAD boards, DriveKNMS provides lifecycle extension support including: direct board replacement with tested units, cross-reference identification for superseded part numbers, and technical consultation on compatible substitute boards where direct replacements are unavailable. All units are shipped with full traceability documentation. Inquiries for obsolete or low-availability models are handled on a priority basis.

Quality Control for the KRAFT-G/CAD Range

KRAFT-G/CAD boards incorporate multi-layer PCB construction with surface-mount and through-hole components, including precision analog circuits, optocoupler isolation stages, and EPROM-based firmware storage. DriveKNMS applies a structured test protocol specific to this board family:

Visual inspection covers solder joint integrity, capacitor condition, relay contact wear, and connector pin alignment. Functional testing replicates the board's operating environment using a dedicated drive system test bench, verifying regulation loop response, I/O signal accuracy, and communication port integrity under load. Boards with EPROM firmware are verified against known-good firmware checksums. Backplane connector compatibility is confirmed prior to dispatch. Each tested unit is assigned a unique test record and ships with a condition report.