Digital guide

You are here:
  1. Home
  2. Woodward
  3. Woodward 9905-658

Woodward 9905-658

Product Introduction:​ The 9905-658 is part of the widely adopted 2301A series of load sharing and speed control modules. Designed to govern the speed and load sharing functions of prime movers—such as diesel engines, gas engines, and turbines—this module provides precise isochronous or droop control, supporting both standalone and generator-parallel applications. The 9905-658 offers compatibility with dual-coil actuators and operates in a forward-acting configuration. It is field-configurable for various speed ranges and control dynamics.

WhatApp
WeChat

Detailed content

Technical Specifications:
  • Series: Woodward 2301A (9905/9907 series)
  • Actuator Compatibility: Dual-coil actuators
  • Acting Configuration: Forward-acting
  • Operating Temperature: –40 °C to +70 °C
  • Storage Temperature: –55 °C to +85 °C
  • Humidity: 95% RH non-condensing
  • Mounting Orientation: Any
  • Enclosure: Metal chassis, panel-mountable
  • Dimensions (approx.): 304.8 × 203.2 × 76.2 mm (12″ × 8″ × 3″)
  • Weight: ~2.7 kg (6 lbs)
  • Power Supply: High-voltage model (90–150 Vdc or 88–132 Vac)
Functional Features:
  • Precise isochronous or droop control
  • Field-configurable for various speed ranges and control dynamics
  • Supports standalone and generator-parallel applications
  • Housed in a sheet-metal chassis consisting of a single printed circuit board
  • All potentiometers accessible from the front of the chassis
  • Provides isochronous load sharing between 2301A systems via load-sharing lines
Application Scenarios:​ Governs speed and load sharing for prime movers (diesel engines, gas engines, turbines) in generator systems; applicable in industrial power generation, marine auxiliary power, and offshore/onshore compressor stations.
Working Principle:​ The 2301A provides control in either isochronous or droop mode. In isochronous mode, it maintains constant prime mover speed for single-prime-mover operation, two or more prime movers on an isolated bus, or base loading against an infinite bus. In droop mode, speed control is a function of load for single-prime-mover operation on an infinite bus or parallel operation of multiple prime movers. The control compares actual speed (from MPU signal) against the reference and drives the actuator accordingly.
Installation Requirements:
  • Install in a closed electrical operating area or enclosed industrial control cabinet
  • Ensure adequate ventilation and maintenance space
  • Use shielded wiring; terminate shields at the cabinet ground bus
  • Verify correct MPU polarity
  • Do not mount the controller on the engine
  • Ambient operating temperature must be within –40 °C to +70 °C
Usage Precautions:
  • Ensure an independent overspeed shutdown device is installed on the prime mover
  • Handle with ESD precautions; do not touch PCB components directly
  • Do not force front-panel potentiometers beyond mechanical stops
  • Refer to Woodward manual 82389 (2301A LSSC Manual) for detailed troubleshooting

You may also like