General Information

Feature-focused Description

The Woodward 9905-969 is a LinkNet distributed I/O module featuring a 6-channel 4-20 mA analog input design with an integrated 24 VDC loop power supply. Fully compatible with MicroNet and 505E digital governor control networks, this unit works seamlessly with industrial industrial prime movers to deliver flexible process sensor routing and stable high-speed serial communication loop management. 

Specific Application

• Distributed analog signal collection for 4-20 mA industrial transmitters tracking field pressure, temperature, or flow parameters.
• High-reliability remote I/O sensor expansion for Woodward 505E digital governors and MicroNet turbine system networks.
• Prime mover engine telemetry and safety feedback routing within space-saving industrial field junction enclosures.

Ordering Information

System Compatibility and Alternative Models

System Compatibility: Connects directly to Woodward 505E digital governors and MicroNet control networks via a LinkNet twisted-pair serial protocol interface. It interfaces with standard process instrumentation using standard 4-20 mA industrial current loops and handles a 24 VDC auxiliary loop supply configuration.

Alternative Models: Woodward 9905-970 LinkNet RTD Input Module or Woodward 9905-966 Thermocouple Input Module.Key Differences:

Input Signal Type: The 9905-969 is engineered exclusively to sample 4-20 mA current signals, whereas the 9905-970 measures 100-ohm RTD resistance curves and the 9905-966 processes direct thermocouple voltage steps.

Loop Power Capabilities: The 9905-969 integrates internal 24 VDC excitation to support two-wire unpowered transmitter configurations, which is absent on direct RTD or temperature logging modules.

Installation & Troubleshooting FAQ

Q1: How do I switch the 5501-1432 output between integrating and proportional driver modes?

A: The operational mode of the bi-polar channels is entirely software-selectable. Field technicians do not need to adjust physical jumpers on the module board. Instead, configuration flags must be defined within the Woodward Graphical Application Program software prior to compiling and downloading the control application to the CPU.

Q2: Which Field Termination Module and cable assembly must be used with this card?

A: The 5501-1432 requires the 5437-672 Field Termination Module to safely break out field instrument terminal connections. Connection between the main chassis slot and the FTM must be established using matching shielded cables designated under Woodward's system-wide Table K specification matrix.

Q3: What does a solid fault indicator or an unexpected zero-current output signify on a channel?

A: This condition typically indicates a field-side open circuit, an excessive loop resistance mismatch, or a shorted actuator coil. The module monitors output feedback continuously. If loop parameters drift outside safe boundaries, the internal circuit safeties trip the affected channel. Verify coil resistance at the 5437-672 FTM terminal strips.

Q4: Can the 5501-1432 module be used in both Simplex and TMR chassis?

A: Yes. The module is fully compatible with both MicroNet Plus and MicroNet TMR frameworks. When deployed in a TMR kit environment, specialized redundant cabling configuration paths must be routed to handle voted relay tracking configurations safely.

Q5: Why is my turbine valve sluggish when driven by a lower-tier alternative card instead of the 5501-1432?

A: Sluggishness indicates that the actuator coil requires higher power to overcome mechanical spring forces. If a +/- 120 mA card is mistakenly used where a +/- 245 mA module is specified, the actuator coil will be starved of necessary current, leading to degraded response times or complete failure to hit valve travel setpoints.