WOODWARD 5405-818 is a high‑integrated digital governor and I/O control system for industrial steam turbines, turbo‑expanders and prime mover packages, widely deployed in power generation, oil & gas and petrochemical plants. It combines precision speed/load regulation, 16‑point discrete I/O and multi‑protocol communication in a compact rail‑mount unit, acting as a reliable control core for both new turbine projects and retrofits. With industrial‑grade EMC protection, wide voltage tolerance and extended temperature range, it ensures stable, safe and efficient operation under harsh field conditions.
General Description
The WOODWARD 5405-818 is a microprocessor‑based digital governor system engineered to start, stop, control and protect industrial steam turbines and turbo‑expanders. It integrates a high‑speed CPU, 64 MB memory, 16 digital inputs and 16 digital outputs, providing comprehensive signal acquisition, logic interlock and actuator drive capability. The controller accepts high‑frequency speed signals and 4–20 mA / 1–5 Vdc analog setpoints, supporting isochronous (zero droop) and droop modes for grid‑parallel or isolated operation. It offers built‑in overspeed protection, speed limiting, startup fuel ramping and fault diagnostics, while communicating via Modbus TCP, Ethernet/IP or PROFIBUS DP to DCS and other Woodward controllers (e.g., 505/505E/Atlas). The unit operates on 24 VDC ±10% power, fits standard cabinet rail mounting, and withstands wide temperature and vibration environments.
Main Features
All‑in‑one digital governor system with 16DI / 16DO and 64 MB high‑speed memory
Precision speed/load control: isochronous (zero droop) and droop (load sharing) modes
Speed input: 500–12000 Hz; setpoint input: 4–20 mA / 1–5 Vdc
Multi‑protocol communication: Modbus TCP, Ethernet/IP, PROFIBUS DP
Built‑in overspeed trip, high/low speed limit and startup fuel limiting
Comprehensive fault monitoring, alarm and self‑diagnosis functions
24 VDC ±10% power supply; operating temperature -10 °C to +60 °C
Compact rail‑mount design; industrial EMC, shock and vibration resistance
Technical Parameters
Model: 5405-818
Type: Digital Governor System / Integrated Control & I/O Module
Applicable Prime Movers: Industrial steam turbines, turbo‑expanders, gensets
Speed Input Range: 500–12000 Hz
Analog Setpoint: 4–20 mA / 1–5 Vdc
Digital I/O: 16 inputs / 16 outputs
Memory: 64 MB
Communication: Modbus TCP, Ethernet/IP, PROFIBUS DP
Power Supply: 24 VDC ±10%
Operating Temperature: -10 °C to +60 °C
Storage Temperature: -40 °C to +85 °C
Dimensions: 120 × 80 × 30 mm
Weight: Approx. 1.0 kg
Installation: Cabinet rail mount
Certifications: CE, RoHS compliant
Application Scope
Primarily used for speed regulation, load control and safety protection of industrial steam turbines, turbo‑expanders and generator sets in electric power, petroleum, chemical and process industries. It performs turbine startup/shutdown, overspeed protection, load sharing and remote monitoring, and integrates seamlessly with Woodward governors and DCS to form a complete prime mover control system for both new installations and system upgrades。
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