HGM410N HGM420N AMF Diesel Generator Controller Color HGM420N Overview A compact automatic mains failure (AMF) controller designed for diesel generator sets. Provides reliable automatic start and stop, basic monitoring, and protection functions to keep backup and prime power systems operating with minimal operator intervention. Key benefits Automatic operation: Detects mains failure and starts the generator automatically, then returns to mains when supply is restored, reducing downtime. Simplifies management: Consolidates control, monitoring, and protection functions in a single unit for easier installation and operation. Improved reliability: Designed for continuous use in generator control panels to support critical power requirements. Compatibility: Works with HGM410 and HGM420 series controllers and common diesel generator set configurations. Primary functions Automatic mains failure detection and generator start/stop control. Basic monitoring of generator status and fault conditions. Manual and automatic operating modes for flexible control. Alarm output and protective shutdown on detected faults. Important attributes Models covered: HGM410, HGM410N, HGM420, HGM420N. Color identified as HGM420N. Function: AMF diesel generator controller for automatic changeover and generator management. Compatibility: Intended for use with diesel generator sets and standard transfer switch arrangements that accept AMF controller signals. Size and mounting: Compact control module suitable for panel mounting and integration into standard control enclosures. Material and build: Rugged enclosure and industrialgrade internal components suitable for generator control environments. Performance: Designed to provide timely automatic response to mains loss and reliable generator control and protection during operation. Why customers choose this controller Reduces the need for manual intervention during power interruptions. Consolidates essential generator control features into a single, easytoinstall device. Supports both automatic and manual operation to match site requirements. Typical applications and use scenarios Commercial building backup power: Automatically starts the building generator when utility supply fails and restores mains once stable. Construction and rental generator sets: Provides automated control and basic protection for temporary power installations. Remote sites and telecommunications: Ensures unattended generator operation for sites where prompt automatic response is required. What is included AMF controller unit in color HGM420N. Models HGM410 and HGM420 families supported. Installation requires appropriate wiring to the generator set and transfer switch per site wiring standards. Installation and integration notes Intended for panel integration with compatible diesel generator control wiring. Commissioning should be performed by qualified technicians to verify correct input and output connections and to set up operating modes and protection thresholds as required. This controller delivers straightforward automatic mains failure control and generator management for backup and prime power applications where reliable, compact electric controls are required.