WOODWARD 9905-973 Power Control Module

Description

The Woodward 9905-973 is an 8-channel discrete output relay module used primarily in control systems for gas turbines and industrial automation. It is part of the LinkNet distributed I/O system designed to interface with Woodward’s turbine control architectures. The module enables remote and programmatic switching of multiple electrical loads or actuators within the control system, offering reliable individual relay control across eight separate channels.

Designed for harsh industrial environments, the 9905-973 features a rugged casing with dimensions of approximately 8.75 inches in width, 14.625 inches in depth, and 5.375 inches in height. It includes functional fault LEDs and a reset button for easy troubleshooting and maintenance. The module operates on an input voltage range of 18 to 32 VDC, with power consumption around 14 W. Each relay channel can handle switching of high-power loads with typical contact ratings of 5 A at 240 V AC or 10 A at 120 V AC, accommodating a wide variety of industrial actuators and equipment.

This relay module supports secure and noise-immune operation with network isolation rated up to 1000 Vrms and a maximum stub cable length of 300 mm. The module is designed for operation within a temperature range of 0°C to 70°C, supporting reliability in typical industrial atmosphere conditions. It provides 24 V DC output voltage ratings and is proven compatible with Woodward LinkNet control protocols integrating smoothly with system controllers.

The 9905-973 is ideally suited for controlling multiple relay-driven components such as actuators, alarms, solenoids, and auxiliary systems in turbine and process control environments. It enhances system flexibility by allowing centralized control of multiple devices from a digital networked controller.

Related modules in the LinkNet family that complement the 9905-973 include various analog input/output nodes, discrete input modules, and controller modules such as the 9905-971 (16-channel discrete input module), 9905-972 (analog output node), and updated LinkNet HT nodes with improved network flexibility.

Installation requires secure rack or panel mounting and adherence to wiring practices to maintain network integrity and safety. Routine maintenance includes verifying relay operations, cleaning terminals, and checking fault LED indicators to promptly identify issues. Woodward’s documentation provides detailed wiring diagrams and operational guidance.

The module features eight independent relay channels with contact ratings typically at 5 A for 240 V AC and 10 A for 120 V AC. It operates on 18–32 V DC power supply, draws approximately 14 W, and supports network isolation of 1000 Vrms to ensure signal integrity. The rugged housing measures about 8.75″ (W) x 14.625″ (D) x 5.375″ (H) and weighs approximately 9.11 lbs, designed for heavy industrial environments with an operating temperature of 0–70°C. Functional fault LEDs and a reset button assist with easy diagnostics and maintenance.

This relay module is compatible with Woodward’s LinkNet communication protocols, allowing integration with digital control systems for precise distributed I/O control. It supports a maximum bus node count of 64 and is suited for industrial automation projects requiring multiple relay output controls.

Related LinkNet modules complement the 9905-973 relay module, such as the discrete input modules, analog output nodes, and updated LINKnet HT series, enhancing turbine control system capabilities.

Installation requires secure panel or rack mounting with proper grounding and signal wiring to maintain network performance. Routine maintenance includes inspections of relay function, connection integrity, and fault LED diagnostics. Woodward offers a global support network, warranty coverage, and refurbishment services, ensuring long-term operational reliability of the 9905-973 in critical turbine control applications.