Woodward 9903‑470 AGLC Automatic Generator Loading Control Unit

Woodward 9903‑470 is an AGLC automatic generator loading control device, widely matched with 2301A speed governors for genset parallel‑operation systems. It realizes soft‑load and soft‑unload function when generator sets connect or disconnect from utility bus, completes bumpless power transfer to avoid power impact and frequency fluctuation during grid‑connection process.

This chassis‑mount loading controller features adjustable loading ramp rate, base‑load contact input and status LED indicators. It works cooperatively with speed governor and synchronizer to complete generator grid‑connection logic. It is widely used as replacement spare‑part for on‑site troubleshooting, equipment maintenance and legacy power‑generation‑system retrofit projects.

Main Specifications

• Brand: Woodward
• Model: 9903‑470 (AGLC Automatic Generator Loading Control)
• Product Type: Generator Soft‑Load & Unload Control Unit
• Power Supply: 88‑132VAC, 50/60Hz
• Function: Adjustable load ramp rate, base‑load contact control input
• Cooperation Device: Matched with 2301A governor and synchronizer module
• Indicator: Multi‑LED for loading status and fault indication
• Mounting: Metal chassis rack‑mount installation inside generator control cabinet
• Operating Temperature Range:‑20℃ ~ +65℃
• Application: Spare‑part replacement for generator‑set parallel‑control equipment

Core Functions

• Realize soft‑loading process when generator synchronizes and connects to utility infinite bus
• Perform soft‑unloading control before generator disconnecting from grid to reduce system impact
• User‑adjustable ramp rate ensures smooth power transfer without frequency or voltage disturbance
• External contact input triggers base‑load mode to fix generator output power at target value
• Work with 2301A speed governor to coordinate speed regulation and power‑loading logic
• Front‑panel LED indicators display loading progress, working state and abnormal alarm information
• Metal chassis structure provides good vibration‑resistance for engine‑room harsh‑environment conditions
• Chassis‑mount layout facilitates on‑site installation and spare‑part replacement operation

Application Scenarios

• Land‑based power‑plant genset grid‑connection control cabinet configuration projects
• Marine vessel multi‑generator parallel‑operation soft‑load control supporting projects
• On‑site AGLC loading‑controller fault replacement and daily genset‑control‑system maintenance work
• Legacy power‑generation‑system renovation for upgrading bumpless grid‑connection performance
• Legacy Woodward AGLC‑series loading‑control‑unit spare‑parts replacement scenarios
• Spare‑parts inventory backup for power‑plant and marine‑engine‑room control cabinets
• Generator‑set control cabinet soft‑load‑hardware maintenance supporting engineering projects