The Woodward 9905-973 is a highly reliable 8-channel relay output module designed specifically for the LinkNet distributed I/O system. This module is essential for applications requiring precise, high-speed control of external industrial machinery, such as actuators, valves, and alarm indicators. Engineered for seamless integration with Woodward’s digital control platforms, it provides distributed intelligence in mission-critical environments including power generation, marine propulsion, and turbine management systems.
Product Parameters
Product Model: 9905-973 System Family: LinkNet Distributed I/O Function: 8-Channel Relay Output Module Operating Voltage: 24V DC nominal Output Type: 8 Independent Form C (SPDT) Relay Contacts Communication: LinkNet Serial Bus (RS-485 based) Operating Temperature: -25°C to +70°C Mounting: DIN-rail mount Weight: 0.65 kg Original Manufacturer: Woodward, Inc. Origin: USA / Global Manufacturing
Technical Datasheet Overview
The 9905-973 acts as a remote actuator interface, receiving command data from the main controller via the LinkNet bus and converting it into physical relay operations.
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Flexibility: The 8 channels allow for independent control of various auxiliary devices.
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Safety: Each relay output is galvanically isolated, protecting the LinkNet bus from potential electrical faults or surges originating in the field-side wiring.
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Diagnostics: Features onboard health monitoring that reports relay status and communication integrity back to the main control unit, ensuring maximum system uptime.
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Robustness: Built to withstand high-vibration environments commonly found in turbine and engine compartments.
For comprehensive technical documentation and system architecture details, please visit the Woodward 9905-973 product page.
Application Fields
This module is a staple in industries where reliability is non-negotiable:
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Gas & Steam Turbines: Managing auxiliary equipment like fuel shutoff valves, lube oil pumps, and start/stop logic.
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Marine Power Systems: Coordinating generator set synchronization and circuit breaker control.
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Compressor Control: Executing staging and loading/unloading sequences for large-scale air and gas compressors.
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Industrial Automation: General-purpose distributed control where remote relay switching is required over long cable distances.
Product Operating Instructions
Installation must be performed by authorized personnel familiar with Woodward control architectures. Ensure the LinkNet bus is properly terminated at both ends of the segment to prevent signal reflections. Secure the module onto the DIN rail, then connect the 24V DC power supply to the designated power terminals. Using the main controller software, assign a unique LinkNet node address to the module. Once connected, perform a functional test using the “Force” command in the control software to actuate each relay individually, verifying that the corresponding field device operates as expected.
Frequently Asked Questions (Q&A)
What is the maximum contact rating for the relays? The relays are typically rated for 5A at 24V DC or 120/240V AC; however, always refer to the specific datasheet for your installation to avoid exceeding inductive load limits. How do I troubleshoot a communication error on the LinkNet bus? Check the status LEDs on the module; if the “Comm” LED is flashing or off, verify the integrity of the shielded twisted-pair communication cable and ensure the bus is terminated with a 120-ohm resistor. Can this module be used without a main Woodward controller? No, the LinkNet modules are proprietary and require a Woodward master controller to interpret and send the necessary control packets. What is the difference between this and the 9905-xxx series? The 9905-973 is part of the 8-channel specific relay family; other models in the series may offer analog input/output capabilities or higher density configurations.
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