Woodward 9905-970 LinkNet 6-Channel Input Module | Turbine Control

Description

Product Overview

The Woodward 9905-970 is a LinkNet 6-Channel Input Module from the 9900 Series. It reads analog signals from turbine sensors. These sensors measure temperature, pressure, and flow rate. The module sends this data to the control system. This helps the turbine run safely and efficiently.

Key Features at a Glance

• • Six Analog Input Channels

Monitor up to six different parameters at the same time.

• • Wide Signal Support

Accepts 0-10V voltage and 0-20mA current signals.

• • High Measurement Accuracy

Provides precise readings for better turbine control.

• • Plug-and-Play Design

Easy to install and set up. No complex tools needed.

• • Scalable System

Combine with other LinkNet parts to fit your turbine size.

Technical Specifications

• Brand: Woodward
• Part Number: 9905-970
• Series: 9900 Series LinkNet
• Module Type: 6-Channel Analog Input Module
• Input Voltage: 24 Vdc
• Maximum Operating Current: 12 V
• Signal Input Impedance: 33K Ohms
• Display: 24-character LEDs
• Power Supply Transient Protection: 900 Vdc
• Operating Temperature: -40°C to +85°C
• Dimensions: 14 x 11 x 4 inches
• Weight: 2 lbs
• Country of Origin: United States (USA)
• Availability: In Stock

Performance Data

• Input Range (Voltage): 0 to 10 Vdc
• Input Range (Current): 0 to 20 mA
• Accuracy: ±0.1% of full scale
• Resolution: 16-bit analog to digital
• Linearity Error: Less than ±0.05%
• Frequency Response: 10 Hz (typical for turbine signals)
• Sensitivity: 1 mV per count

Environmental & Immunity

• Temperature Range: -40°C to +85°C (operating)
• Storage Temperature: -55°C to +125°C
• Humidity Tolerance: 0 to 95% non-condensing
• Noise Immunity: 900 Vdc transient protection on power supply
• Vibration Resistance: 5g at 10-500 Hz

Diagnostic Capabilities

• LED display shows each channel’s status (OK, fault, or overload).
• Built-in open wire detection for every input.
• Auto-range detection for 0-10V or 0-20mA signals.
• Power supply health monitoring via LED code “Pwr”.

Typical Applications

• Gas turbine inlet temperature monitoring.
• Steam turbine bearing pressure measurement.
• Fuel flow rate sensing in power plants.
• Compressor surge control systems.
• Replacing older Woodward analog input cards.

Installation Guide

• Mount module vertically inside a clean control panel.
• Connect 24 Vdc power to the marked terminals.
• Wire each sensor to channels 1 through 6.
• Keep analog signal wires away from high-power cables.
• Use shielded twisted pair cable for long runs over 30 meters.

Debugging & Maintenance Tips

• Check LED display after power-up. It should flash once.
• Test each channel with a known 10V source once a year.
• Clean dust from vents every 6 months.
• If a channel reads zero, check the sensor wiring first.
• No field calibration needed. The module self-calibrates.

Compatibility Information

• Works with all Woodward 9900 Series controllers.
• Direct replacement for older Woodward analog input modules.
• Compatible with 4-20mA loop powered sensors.
• Use with Modicon Quantum PLCs via a gateway module. See Modicon Quantum Series for options.
• Not compatible with 0-5V sensors without a signal converter.

Certifications & Standards

• CE certified for European markets.
• UL 508 listed for industrial control equipment.
• RoHS compliant (no hazardous substances).
• Meets NEMA ICS 1-1986 vibration standards.

Packaging List

• 1 x Woodward 9905-970 LinkNet 6-Channel Input Module
• 1 x 24-pin terminal block connector.
• 1 x Installation quick sheet.
• No sensors or cables included. Order separately.

Warranty & Shipping

• Warranty: 12 months from invoice date.
• Shipping Methods: FedEx, UPS, DHL.
• Same-day shipping for orders placed before 2 PM EST.

Frequently Asked Questions (FAQ)

• • What is the difference between this and the 5501-471?

The 9905-970 reads analog inputs (6 channels). The 5501-471 is a serial communication module.

• Can I use this with a 4-20mA sensor?

Yes. Set the channel to current mode via the software.

• My channel 3 shows “Err 07”. What does that mean?

This means “open wire” on channel 3. Check the sensor connection first. Most users find a loose wire.

• What is the maximum cable length for the input signal?

Up to 300 meters for 0-10V signals. Use shielded cable.

• Should I buy this or a newer model?

Buy this if you have an existing 9900 Series system. For new turbine projects, look at the current LinkNet Gen 2 modules.

• Does this work outdoors in direct sun?

Yes, up to +85°C. But protect the LED display from long-term UV exposure.

• How many modules can I connect together?

Up to 16 LinkNet modules per controller. This gives you 96 analog inputs total.

Selection Guide (Buying Advice)

• Count your sensors first. Each sensor needs one channel.
• Check your sensor type. Use this module for 0-10V or 0-20mA sensors.
• Need temperature readings? This module works with PT100 or thermocouple transmitters.
• Avoid this module if you need digital inputs or high-speed pulse counting.
• Buy the 9905-970 for reliable, accurate, and rugged analog input monitoring.
• For mixed signal types, combine this with a Woodward discrete input module.

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