Product Overview

The Woodward 9905-867 provides specialized digital governing for single-valve or single-valve rack steam turbines. As a cornerstone of the Peak 150 series, this controller offers a compact and cost-effective solution for turbines that do not require the extensive I/O of larger systems but still demand high-fidelity speed regulation. The unit employs a high-speed 16-bit, 12MHz microprocessor to execute complex control algorithms, ensuring stable turbine operation during load swings and critical startup sequences. By replacing aging mechanical or analog governors, the 9905-867 significantly improves frequency stability and transient response. Its ruggedized construction makes it ideal for direct mounting near the turbine skid, providing the reliability required for continuous-duty industrial power generation and mechanical drive applications.

Core Technical Advantages

The 9905-867 hardware architecture prioritizes environmental resilience and communication flexibility. The unit features an integrated NEMA 4X rated enclosure, which protects the internal electronics against windblown dust, rain, and hose-directed water. This allows for installation in harsh outdoor or wash-down environments without requiring additional protective cabinets.

A universal AC/DC power supply handles input ranges of 88-132VAC or 90-150VDC, ensuring compatibility with diverse plant power grids. For system integration, the module supports Modbus protocol over RS-232, RS-422, or RS-485 hardware. This enables the Peak 150 to share critical turbine data—such as speed, setpoints, and alarm status—with Distributed Control Systems (DCS) or PLCs in real-time. The internal firmware includes dedicated logic for critical speed avoidance and overspeed protection, providing a layered safety approach for high-speed rotating assets.

Technical Specifications

Installation & Engineering Guide

Successful deployment of the Woodward 9905-867 requires careful attention to signal isolation and grounding. Mount the NEMA 4X enclosure securely to a vibration-dampened surface to maintain the integrity of the internal microprocessor. When running the speed-sensing circuit, utilize high-quality shielded twisted-pair cabling for the Magnetic Pickup (MPU) to prevent electromagnetic interference from the generator or motor leads from causing false speed readings.

For power wiring, ensure the input voltage stays within the specified 88-132 VAC or 90-150 VDC window. While the unit is robust, sustained overvoltage can degrade the internal power supply components. During commissioning, utilize the Modbus interface to verify that the DCS setpoints match the Peak 150 internal registers. Always perform a local overspeed trip test during the initial startup to verify that the control unit correctly actuates the steam shut-off valves at the programmed safety limits.

Engineering Advantages

The 9905-867 excels in applications where space is at a premium but high-speed digital accuracy is non-negotiable. Its wide operating temperature range (-25°C to +60°C) allows for reliable performance in remote pump stations or outdoor refinery skids. The unit integrates seamlessly with existing Turbo System Integrity (TSI) frameworks, acting as a reliable speed governing layer that communicates flawlessly with modern PLC-based safety systems. Choosing the Peak 150 ensures a balance of low total cost of ownership and the proven engineering excellence of the Woodward turbine control lineage.

Delivery & Logistics

We maintain a dedicated stock of the 9905-867 to support your urgent maintenance and upgrade cycles.

• Delivery Time: 3-5 days after payment is confirmed.

• Shipping Carriers: Worldwide express delivery via DHL, FEDEX, or UPS.

• Condition: Brand New, Factory Sealed in original Woodward protective packaging.

Technical FAQs

Q1: Can the 9905-867 handle both AC and DC power inputs?

A1: Yes, the unit features a flexible power supply designed to operate on either 88-132 VAC or 90-150 VDC, allowing it to adapt to various industrial power environments.

Q2: What communication protocols does this Peak 150 model support?

A2: It supports Modbus RTU protocol via RS-232, RS-422, or RS-485 serial interfaces, making it easy to integrate with most modern PLCs and HMI systems.

Q3: Is the NEMA 4X enclosure suitable for outdoor installation?

A3: Absolutely. The NEMA 4X rating ensures the unit is protected against corrosion, dust, and water ingress, making it suitable for demanding outdoor or coastal industrial sites.

Q4: Does this unit support dual-valve turbine control?

A4: No, the 9905-867 is specifically optimized for single-valve or single-valve rack steam turbines. For dual-valve or extraction applications, we recommend the Woodward 505 series.