Description
Technical Specifications
- Product Model: 9903‑470
- Brand: Woodward
- Warranty: One Year
- Input Voltage: 90‑150 V DC auxiliary power supply
- Operating Temperature: -20 °C to +65 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: ≤5 ms reference signal update cycle
- Protection Class: IP20 (rack‑mount module, cabinet‑only installation)
- Accuracy Class: Class 0.1 for speed reference output
- Output Frequency: 0‑4000 Hz configurable pulse output
- Rated Current Range: 0‑100 mA drive output capacity
- Communication Interface: Terminal block hard‑wired I/O, RS485 service port
- Supported Protocols: Modbus RTU, custom Woodward service protocol
- Overload Capacity: 1.2× rated output for 30 seconds short‑term withstand
- Dimensions: 225 mm × 115 mm × 50 mm
Product Overview
The Woodward 9903‑470 is a rack‑mount digital reference unit built for prime‑mover control systems on gas turbines, steam turbines and large reciprocating engine gensets. This module generates stable, configurable speed and load reference setpoints for downstream Woodward governors and turbine control hardware. It mitigates common field‑site issues including unstable analog reference signals, reference drift under variable supply voltage, and limited setpoint adjustability for multi‑unit generator paralleling applications. Turbine control engineers, power‑plant commissioning technicians and stationary‑engine maintenance teams benefit from this unit. Its digital reference generation reduces analog‑circuit drift, improves setpoint repeatability, and removes the need for multiple external potentiometer assemblies. Designed for retrofit and new‑build power‑generation installations, it integrates with existing governor wiring layouts without extensive cabinet rework.
Application Scenarios
- Gas‑Turbine Generator Control: Delivers precision speed and load‑sharing reference signals to turbine governor hardware. It maintains consistent setpoints during supply‑voltage fluctuations and supports stable generator paralleling across multiple turbine‑driven generation units.
- **Steam‑Turbine Auxiliary Control Systems: Acts as remote setpoint source for turbine load controllers. Operators adjust target output values locally or via supervisory system links; the unit filters reference‑command noise to prevent unstable governor response and turbine hunting.
- Reciprocating Engine Genset Paralleling Plants: Provides synchronized reference signals for multi‑engine generator installations. It supports base‑load and peak‑shifting operating modes, stabilizes load distribution between engine sets and lowers frequency‑deviation risk during grid‑connected operation.
- Legacy Prime‑Mover Control Retrofit Projects: Replaces older analog reference boards during plant modernization. The terminal‑block‑compatible form factor fits existing rack slots, cutting cabinet modification work and shortening commissioning cycles for power‑plant upgrade projects.
Reviews
There are no reviews yet.