WESTINGHOUSE 5X00226G02

Product Overview
The WESTINGHOUSE 5X00226G02 is a high-reliability analog output module originally engineered for Westinghouse Distributed Processing Family (WDPF) control systems. This legacy industrial I/O module remains essential for thousands of fossil power plants, chemical facilities, and steel mills still operating Westinghouse/Eaton WDPF infrastructure. The WESTINGHOUSE 5X00226G02 provides precise 4-20 mA current loop outputs for modulating control valves, variable frequency drives, and positioners in mission-critical continuous processes.

Technical Specifications
The WESTINGHOUSE 5X00226G02 features 8 isolated analog output channels individually configurable for 4-20 mA or 0-10 VDC operation. Each channel provides 12-bit resolution with ±0.25% full-scale accuracy and 500 VDC channel-to-ground isolation. Output loop compliance voltage is 24 VDC maximum with short-circuit protection and open-loop detection per channel. The module communicates via Westinghouse proprietary I/O bus and occupies a single slot in WDPF distributed processing unit racks. The WESTINGHOUSE 5X00226G02 requires +5 VDC and ±15 VDC from the backplane, consuming 8 W typical. Operating temperature range is 0°C to 60°C. Front-panel LEDs indicate channel output status and communication health.

Key Features and Advantages

• Field-Proven Reliability: The WESTINGHOUSE 5X00226G02 has demonstrated mean time between failures exceeding 200,000 hours in continuous baseload power plant applications since original introduction.

• Hold Last Value: Upon communication loss, each channel can be configured to maintain last commanded value, revert to preset failsafe output, or ramp to zero, preventing process upsets during controller interruptions.

• Simplified Calibration: Zero and span potentiometers accessible through front panel enable field recalibration without removal from rack.

• Direct Retrofit Compatibility: Form, fit, and function identical to original Westinghouse 5X00226G01 with enhanced component obsolescence mitigation.

• Wide Loop Power Flexibility: Accepts external loop power from 12 VDC to 48 VDC sources without additional interface hardware.

Application Areas
The WESTINGHOUSE 5X00226G02 remains the designated spare part for hundreds of coal-fired generating units where WDPF systems continue operating beyond original design life. A major Southeastern US utility recently purchased 45 WESTINGHOUSE 5X00226G02 modules to support life extension programs across their remaining WDPF-controlled boiler islands. The module is also extensively deployed in legacy chemical batch reactors, pulp digester control systems, and steel mill reheat furnaces where control system migration is planned but not yet funded.

Competitive Comparison
Versus third-party replacement modules and universal analog output converters, the WESTINGHOUSE 5X00226G02 guarantees exact mechanical fit, backplane pinout compatibility, and communication protocol timing required for WDPF deterministic operation. Generic substitute modules often experience communication timeouts or require external protocol converters that introduce latency unacceptable for closed-loop control. The WESTINGHOUSE 5X00226G02 also maintains the original Westinghouse calibration curve characteristics, eliminating loop retuning when replacing failed units. While Emerson Ovation migration paths exist, the WESTINGHOUSE 5X00226G02 provides immediate, drop-in replacement capability without engineering hours or process downtime.

Selection Guidelines and Precautions

• Verify that your WESTINGHOUSE 5X00226G02 is ordered with the correct firmware revision for your specific WDPF DPU version; early 5X00226G02 units may lack compatibility with later Westinghouse WDPF II systems.

• Confirm that existing field wiring termination panels (FTA) are compatible; the WESTINGHOUSE 5X00226G02 requires specific 5X00300 series termination bases for proper signal connection.

• The WESTINGHOUSE 5X00226G02 is NOT compatible with Emerson Ovation I/O racks without extensive backplane modifications; order only for genuine WDPF systems.

• When replacing 5X00226G01 modules with the WESTINGHOUSE 5X00226G02, record existing potentiometer positions before removal to establish baseline calibration settings.

• Ensure external loop power supplies are de-rated appropriately for total simultaneous output current; eight channels at 20 mA requires minimum 160 mA capacity per module.

• Order the WESTINGHOUSE 5X00226G02 with companion 5X00227G02 analog input modules to maintain consistent sparing philosophy and reduce inventory variety.

• The WESTINGHOUSE 5X00226G02 contains electrolytic capacitors subject to age-related degradation; request manufacturing date code when ordering for critical applications to ensure maximum remaining service life.