9904-061
May 26, 2026

9904-061

Woodward 9904‑061 is a digital speed‑load controller with integrated auto‑synchronizer, belonging to the 9904 series. It is specially designed for diesel/gas engines, steam/gas turbines and generator sets, combining speed governing, load sharing, grid synchronization and overspeed monitoring. Widely used in power generation, petrochemical, marine and heavy‑duty industrial control systems.

Description

Core Functions

  1. Dual control modes: isochronous mode for standalone genset constant‑speed operation; droop mode for multi‑unit parallel load sharing

  2. Built‑in high‑precision synchronizer, automatically matches frequency, phase and voltage for grid‑connection

  3. PID closed‑loop speed/load regulation, supports critical speed avoidance, valve stroke limit and startup protection

  4. Independent overspeed monitoring, real‑time self‑diagnosis, fault logging and multi‑channel relay alarm output

  5. 4‑20 mA / 1‑5 VDC remote setpoint input, compatible with upper‑level DCS/PLC linkage

  6. Local HMI parameter setting + dedicated Woodward software for online tuning and real‑time monitoring

Electrical Specifications

  • Power Supply: 24 VDC (wide‑range input: 18–40 VDC)

  • Speed Input: Magnetic Pickup (MPU) sensor signal

  • Actuator Output: PWM / 0‑10 VDC analog signal for hydraulic/electric actuators

  • Analog I/O: Programmable 4‑20 mA input/output; multi‑channel digital contact I/O

  • Communication: RS‑232/485 serial port, Modbus‑RTU protocol, optional Ethernet

  • Safety Grade: Class 1 Div 2 hazardous area certification, industrial‑grade anti‑interference

Environmental & Mechanical Features

  • Operating Temperature: −40 °C ~ +85 °C

  • Vibration & Shock: Compliant with heavy‑duty industrial turbine standards

  • Mounting: Panel‑mount installation

  • Enclosure: Rugged metal housing, dust‑proof and corrosion‑resistant

Typical Applications

  • Engine/turbine generator set speed‑load control & grid synchronization

  • Petrochemical and power plant prime mover governing systems

  • Marine auxiliary power generation control

  • Oil‑gas compressors and turbo‑expander control

  • Multi‑genset parallel operation and load distribution systems


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