Description

Woodward 9907‑685 2301A Load Sharing & Speed Control Module

Technical Specifications

• Part Number: 9907‑685
• Brand: Woodward
• Warranty: One Year
• Input Voltage: 18‑32 VDC nominal 24 VDC operating supply; max 22 W power consumption
• Operating Temperature: ‑40 °C ~ +70 °C cabinet‑mount; fan‑less convection cooling
• Storage Temperature: ‑40 °C ~ +85 °C
• Response Time: Deterministic governor loop update; fast load‑sharing regulation for paralleled generator sets
• Protection Class: IP20 DIN‑rail / panel‑mount industrial governor module; ATEX Zone2 / Class I Div2 certified cabinet‑installation
• Accuracy Class: Precision speed / load‑sharing regulation; speed control accuracy ±0.25 %
• Output Frequency: Pulse‑width‑modulated actuator drive output for Woodward hydraulic actuators
• Rated Current Range: Actuator drive output rated 1 A continuous; analog input 0‑5 V / 4‑20 mA; discrete contact inputs 24 VDC wetting
• Communication Interface: Terminal screw blocks; front‑panel diagnostic LED indicators; service port for handheld programmer 9905‑292
• Supported Protocols: Woodward 2301A governor logic; paralleling load‑sharing algorithm; compatible with diesel / gas generator prime‑movers
• Overload Capacity: Reverse‑voltage protection; hardware watchdog fault‑safe shutdown; transient‑voltage ESD suppression; configurable fault‑trip behavior
• Dimensions: 220 mm ×135 mm ×60 mm; weight approx 1.1 kg

Product Overview

The 9907‑685 is a Woodward 2301A load‑sharing and speed‑governor control module, widely deployed for parallel‑operating generator sets. It executes isochronous speed regulation, real‑time load‑sharing balance among multiple paralleled gensets, accepts CT/PT power‑feedback signals, and drives proportional hydraulic actuators to adjust engine fuel rack position. It maintains stable system frequency and evenly distributes real‑/reactive‑load across multiple running generators.

This module addresses genset‑paralleling challenges: stable speed governing for multi‑unit parallel operation, automatic load‑balance distribution, and drop‑in spare‑part compatibility for legacy 2301A retrofit projects. Handheld programmer supports on‑site parameter tuning without host PC. Power‑generation control engineers, power‑plant and oil‑gas‑site maintenance technicians and retrofit integrators benefit most. It applies for diesel‑generator, gas‑engine gen‑sets used in combined‑heat‑power plants, offshore‑platform power‑systems and petrochemical standby‑power facilities.

Key Application Notes

• Stand‑alone governor module; requires external actuator, CT‑PT power‑sensing signals and handheld programmer 9905‑292 for configuration; cannot run standalone without field peripherals
• Used for isochronous speed control and cross‑unit load‑sharing for parallel generator‑sets
• Multiple configurable operating modes: isochronous, droop, base‑load control
• Not hot‑swap capable: power supply shall be removed before module replacement
• Hardware watchdog implements fault‑safe actuator fail‑position upon internal hardware failure
• Conformal‑coated PCB variant available for high‑humidity, high‑contaminant cabinet environments
• Obsolete original OEM production; widely used aftermarket spare for genset‑parallel‑system maintenance‑retrofit projects
• Commissioning must follow Woodward manual 26006 for CT‑PT wiring and load‑sharing calibration