The Woodward 9905-973, also cataloged as the Linknet 8 Channel Relay Module, operates as a dedicated hardware component for discrete output signaling and circuit execution within gas turbine control network architectures.

Hardware Specifications

Actuator Loop Feedback Response and Relay Control

The Woodward 9905-973 module manages discrete switching states across eight independent relay channels while interfacing with low-level actuator control loops. Providing precise signal conversion down to 0 to 200 mA output profiles and high-voltage isolation, the unit ensures deterministic command execution across turbine governing hardware. Its high-current output relay contacts maintain steady actuation dynamics, mitigating voltage drop across extended field wiring trunks during high-power load changes.

Frequently Asked Questions

Q: What power supply range is required to operate the Woodward 9905-973 module?

A: The module requires an incoming DC power supply voltage between 18 and 32 VDC, consuming 14 W of operating power under standard conditions.

Q: What is the maximum allowable stub length for field communication wiring?

A: The maximum stub length permitted for network branch connections is 300 mm within the operating temperature range of +40 to +85 deg C.

Q: How many independent control channels are available on this module?

A: The module provides eight individually managed relay channels rated up to 24 VDC at 16 A per output circuit.

Field Installation Guidelines

• Mount the module securely inside an IP54 or NEMA-rated metal enclosure to protect internal relay contacts from ambient airborne contaminants.
• Observe strict isolation between 24 VDC control power lines and high-current AC output wiring to prevent induced inductive noise.
• Limit communication drop connections to a maximum stub length of 300 mm from the primary Linknet network trunk.
• Ensure all field wiring shields are grounded at a single earth point to maintain noise immunity across the speed sensing input and actuator output lines.