Description
Product Overview
What Is the Woodward 9905-973?
– Woodward 9905-973 is a Linknet 8 Channel Relay Module. – It controls many devices using low-power digital signals. – Use it for remote or programmed on/off switching. – Each of the 8 relays switches a separate circuit. – A relay is an electric switch that controls high-power loads.
How It Works With Your System
– The module takes digital signals from a computer or controller. – Works with Modicon Quantum PLC systems. – Uses GPIO pins or serial communication (I2C or SPI). – Easy to add to your existing gas turbine control system.
Where to Use This Relay Module
– Home automation projects – Factory automation – Robotics control – Remote device switching – Gas turbine control panels
Technical Specifications
Electrical Ratings
Power Supply & Voltage
Input Voltage Rating: 18 to 32 Vdc, 27.4A
Power Source: 95 to 130 V
Power Consumption: 14 W
Output Voltage Rating: 24 Vdc, 16A
Signal & Sensing
Signal to Actuator: 0 to 200 mA
Speed Sensing: 1 to 30 Vac
Potential Voltage Range: 80 to 150
Isolation & Protection
Network to I/O Channel: 277 Vac
Network Isolation (0–60 Hz): 1000 Vrms
Opto-isolation: Protects the control circuit from spikes.
Network & Communication
– Max Nodes per Bus: 64 nodes (0 to +70°C) – Maximum Stub Length: 300 mm (+40 to +85°C)
Physical & Environment
– External Dimensions: 8.75W x 14.625D x 5.375H inches – Weight: 9.11 lbs – Operating Temperature: Up to 55°C – Country of Origin: United States
Hardware Features
– Reset Button: Restarts the module when needed. – Functional Fault LED: Lights up if a problem occurs. – LED Indicators: One LED per relay shows on/off status. – Compact Size: Easy to mount inside a control panel.
Key Features at a Glance
What Makes This Module Special
– 8 independent relays – Control eight different circuits. – High switching capacity – Handles big loads safely. – Digital control interface – Works with GPIO, I2C, or SPI. – Opto-isolated inputs – No noise or spikes damage your main controller. – LED status lights – See which relay is active at a glance. – Easy mounting – Fits neatly into tight spaces.
Installation & Compatibility
Quick Setup Guide
– Mount the module on a flat, stable surface. – Connect 18-32 Vdc power to the input terminals. – Wire your devices (lights, motors, valves) to the relay outputs. – Connect control signals (GPIO or serial) to the input side. – Press the reset button after wiring is complete.
Compatibility Notes
– Works with most Arduino, Raspberry Pi, and PLC boards. – Fully compatible with Modicon Quantum controllers. – Supports Modbus and serial communication protocols.
5 Professional FAQs (With Selection Guide & Shipping)
Frequently Asked Questions
Q1: Can I use the 9905-973 with a 12V power supply?
No. The module needs 18 to 32 Vdc. A 12V supply will not work. Use a 24V power supply for best results.
Q2: What happens if I connect a load larger than the relay rating?
The internal contacts will weld or burn. Always check your load current. Use an external contactor for big motors or heaters.
Q3: My fault LED is on but the reset button does nothing.
Cycle power off for 10 seconds, then turn back on. Check for shorted wiring on any output channel. Call support if the fault returns.
Q4: How many 9905-973 units can I connect to one controller?
Up to 64 nodes per bus at room temperature. Each module counts as one node. Reduce to 50 nodes if your room exceeds 50°C.
Q5: Does the module store settings after power loss?
No. All relays return to OFF state when power restores. Your main controller must resend the relay states after each startup.
Buyer’s Selection Guide (Expert Tips)
– Choose this Woodward 9905-973 for gas turbine or heavy industrial use. – For home automation only, pick a cheaper non-industrial relay board. – Always add a fuse on the power input (2A slow-blow recommended). – Keep stub length under 300mm to avoid signal reflection errors. – Order a spare unit if your system cannot tolerate downtime.
Warranty & Shipping Information
– Warranty: 12 months from the invoice date. – Covers manufacturing defects only. Does not cover burnt contacts. – Shipping Carriers: FedEx, UPS, DHL. – All orders ship within 24 hours on business days. – Tracking number provided via email.
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