WOODWARD 9905‑367 Digital Speed Sensor Module

The WOODWARD 9905‑367 is a dedicated speed monitor module for Woodward turbine control systems. It receives pulse signals from magnetic pick‑up speed probes, converts frequency pulses into accurate rotational speed values for turbine speed governing, overspeed protection and unit rotation monitoring. It provides core speed measurement data for gas and steam turbine control logic.

This rack‑mount module connects to turbine control chassis backplane for data communication with CPU controller. Front‑panel LED indicators display signal input status and fault conditions for on‑site inspection and troubleshooting. It supports multi‑channel speed signal acquisition and signal fault detection. As aftermarket spare parts, it is widely used for maintenance, replacement and retrofit of power plant and oil‑gas turbomachinery control equipment.

Main Specifications

1. Brand: WOODWARD; Model: 9905‑367; Type: Digital Speed Sensor Input Module
2. Compatible System: Woodward MicroNet‑Plus turbine control platform, corresponding chassis and CPU controllers, magnetic pick‑up speed probes
3. Core Functions: Magnetic pick‑up pulse signal reception, frequency‑to‑speed conversion, rotational speed measurement, backplane bus data transmission, signal loss detection, fault self‑diagnosis, LED status indication
4. Port Resource: Speed probe signal input terminals, chassis backplane connector, front‑panel signal and fault diagnostic LED indicators
5. Supported Feature: High‑precision speed calculation, probe signal abnormality detection, overspeed signal processing, industrial anti‑interference, wide operating temperature range
6. Hardware Feature: Standard rack plug‑in module, industrial‑grade circuit design, passive cooling, designed for turbomachinery control cabinet environment
7. Supply Status: Aftermarket spare part for legacy turbine speed control system maintenance and component replacement

Core Functions

1. Receive pulse signals generated by magnetic pick‑up speed probes installed on turbine shaft.
2. Convert input frequency pulse signals into accurate turbine rotational speed values and transmit data to main CPU via backplane bus.
3. Provide real‑time speed data for turbine speed governing logic, overspeed protection and unit start‑stop sequence control.
4. Detect probe signal loss, signal amplitude abnormality and circuit fault, and report fault status to the turbine control system.
5. Show signal input state and fault alarm information through front‑panel LED indicators for quick on‑site maintenance check.
6. Support multi‑probe signal input, realizing speed signal redundancy to improve the reliability of turbine overspeed protection function.

Application Scenarios

1. Turbine speed measurement unit for power plant and oil‑gas facilities adopting Woodward MicroNet‑Plus control platform.
2. Fault speed‑module replacement and routine maintenance of existing Woodward turbine control cabinets.
3. Speed‑measurement hardware upgrading and technical transformation for aging legacy gas and steam turbine governing and protection systems.
4. Emergency swap for speed‑input‑module failure of continuously‑running critical power‑generation turbine facilities.
5. Spare‑parts stocking for power‑plant instrument‑maintenance teams supporting Woodward series turbine control products.
6. Aftermarket spare supply for turbine‑control‑system overhaul and technical‑service projects of power and oil‑gas industrial facilities.

FAQ

1. Q: Can WOODWARD 9905‑367 work independently without matched chassis and CPU controller?
   A: It must be installed in compatible Woodward turbine chassis and cooperate with main CPU, cannot operate as standalone hardware.
2. Q: What are typical module failure symptoms?
   A: No speed value feedback, speed reading jump or drift, signal loss alarm, overspeed protection false trigger risk.
3. Q: How to complete commissioning and diagnosis?
   A: Inspect rack power supply, backplane contact and magnetic pick‑up probe wiring; check speed value and fault codes through turbine control HMI diagnostic interface.