Westinghouse WDPF 3A99220G01

Technical Dossier

Product Details And Specifications

Westinghouse WDPF Series: Comprehensive Module Range and Technical Overview

The Westinghouse WDPF (Westinghouse Distributed Processing Family) is a distributed control system platform deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, fossil fuel power plants, and large-scale chemical processing facilities. First introduced in the 1980s, the WDPF architecture established a modular, redundant control framework that became a standard reference design for utility-scale DCS installations. Installed base estimates place WDPF systems in hundreds of power generation facilities across North America, Europe, and Asia-Pacific, many of which remain in active operation under long-term maintenance contracts. The platform's longevity is attributable to its deterministic scan cycle, robust backplane bus design, and the availability of a broad catalog of I/O, controller, communication, and power supply modules — including the 3A99220G01 Power Supply Card covered on this page.

The Evolution of WDPF Architecture

The WDPF platform evolved through three distinct architectural generations. The original WDPF I (circa 1983–1991) used a proprietary WEStation bus with parallel backplane addressing, supporting up to 32 I/O modules per drop. Compatibility between WDPF I and WDPF II modules is limited to specific bridge adapters; direct substitution is not supported without engineering review. WDPF II (1991–2002) introduced the WDPF Data Highway (W-DH) serial communication backbone, enabling multi-drop configurations across plant-wide networks. Power supply modules in this generation, including the 3A99220G01, were designed to deliver regulated DC bus voltage to the backplane with built-in over-current and over-voltage protection. WDPF+ (2002–2012) extended the platform with Ethernet gateway modules and OPC server integration, allowing WDPF field I/O to interface with modern SCADA and historian systems. Westinghouse's acquisition by Emerson and subsequent rebranding to Ovation DCS marked the formal end-of-life announcement for WDPF hardware production, though third-party MRO suppliers continue to support the installed base with tested surplus and refurbished modules.

WDPF Full Catalog & Functionalities (SKU List)

The following catalog covers verified WDPF module part numbers organized by functional category. Each entry reflects the module's primary role within the WDPF backplane architecture.

Power Supply Modules

• 3A99220G01: 24VDC regulated backplane power supply card, single-width, WDPF II compatible
• 3A99158G01: Redundant power supply input module, dual-feed configuration, field-replaceable fuse block
• 3A99161G01: 5VDC logic power converter card, supports up to 8 I/O module slots per drop
• 7379A06G01: AC/DC power entry module, 120/240VAC input, internal surge suppression

CPU / Controller Modules

• 1C31234G01: WDPF II process controller card, 32-bit CPU, 512KB RAM, dual-port backplane interface
• 1C31227G01: Drop controller module, handles local scan execution and W-DH communication arbitration
• 1C31238H01: Enhanced process controller, extended memory map, supports function block library v4.x
• 1C31233G03: Redundant controller pair interface card, bumpless transfer on primary fault

Analog Input (AI) Modules

• 1C31189G01: 16-channel 4–20mA analog input module, 12-bit resolution, field-side isolation
• 1C31166G01: 8-channel thermocouple input module, supports J/K/T/E/R/S/B types, CJC onboard
• 5X00070G04: High-speed analog input card, 8-channel, 14-bit ADC, 10ms scan rate

Digital Input / Output (DI/DO) Modules

• 1C31116G04: 32-channel 24VDC digital input module, optically isolated, group commons
• 1C31147G01: 16-channel relay output module, Form C contacts, 2A per channel, DIN rail mount
• 5X00241G02: 32-channel 120VAC digital input module, zero-crossing detection, surge-rated

Communication / Network Modules

• 5X00226G01: W-DH network interface card, coaxial bus termination, supports up to 64 drops
• 5X00106G01: Ethernet gateway module, 10BaseT, OPC DA 2.0 server, WDPF+ generation

Sourcing Hard-to-Find & Obsolete WDPF Parts

Westinghouse formally discontinued WDPF hardware production following the platform's end-of-life designation. OEM replacement parts are no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory of tested surplus WDPF modules sourced from decommissioned plant equipment, controlled storage facilities, and verified MRO suppliers. All units undergo functional verification prior to listing. For critical spares including the 3A99220G01 and related power supply cards, DriveKNMS provides cross-reference matching to identify compatible substitute part numbers where direct replacements are unavailable. Lead times for obscure or low-volume SKUs are quoted on request. Long-term maintenance agreements covering annual inspection, spare allocation, and priority fulfillment are available for facilities operating WDPF systems beyond 2030.

Quality Control for the WDPF Range

WDPF modules present specific test challenges due to their proprietary backplane bus protocol and multi-layer PCB construction. DriveKNMS applies a structured test protocol for all WDPF inventory: (1) Visual inspection for capacitor bulge, PCB delamination, and connector pin corrosion; (2) Powered bench test using a WDPF-compatible backplane simulator to verify bus arbitration, address decoding, and module self-diagnostics; (3) For power supply modules including the 3A99220G01, output voltage regulation is measured under 25%, 50%, 75%, and 100% rated load conditions; (4) Communication modules are tested for W-DH frame transmission and error rate under simulated multi-drop load; (5) All modules are logged with test date, technician ID, and measured parameters before shipment. A 12-month functional warranty is provided on all tested units.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.