Model HGM4020N Electronic Engine Controller Overview The HGM4020N is an Auto Mains Failure electronic engine controller designed for automatic generator and mains management. It adds mains voltage monitoring and automatic transfer control to the ASM functions offered in the HGM4000N series, making it suitable for systems that need reliable switching between mains and generator power. Key benefits Automatic mains failure handling and automatic transfer control for uninterrupted power delivery. Comprehensive monitoring of mains and generator electrical parameters to support fast diagnostics and informed decisions. Remote control and monitoring capability using standard MODBUS and J1939 communication protocols. Durable interface designed for longterm use in harsh environments. Main features Clear backlit LCD, resolution 132 x 64, with selectable language interface including Chinese, English, Spanish, Russian, Turkish, French, Portuguese, and Polish. Pushbutton operation with silicone panel and buttons that remain functional in extreme temperature conditions. Hardscreen acrylic protective cover for the display, offering wear and scratch resistance. RS485 communication port supporting MODBUS protocol for remote control, remote measuring, and remote communication functions. CANBUS port compatible with J1939 genset communication. When connected to an ECU with CANBUS, the controller can monitor engine parameters such as water temperature, oil pressure, speed, and fuel consumption, and can send commands for start, shutdown, speed increase, and speed droop adjustment where supported. Note that CANBUS control requires the connected controller or ECU to provide a CANBUS interface. Measures and displays 3phase voltage, current, power parameters, and frequency for generator and mains systems. Compatibility and electrical systems supported Suitable for 3phase 4wire, 3phase 3wire, singlephase 2wire, and 2phase 3wire systems. Compatible with 120/240 V systems and both 50 Hz and 60 Hz frequencies. Series differences The HGM4000N family includes ASM and AMF models. HGM4010N, HGM4010NC, and HGM4010CAN are ASM models for remote start and stop control. HGM4020N, HGM4020NC, and HGM4020CAN are AMF models that add mains monitoring and automatic transfer capability for generator and mains systems. Practical applications Standby power for commercial buildings: automatic transfer to generator during mains outages and automatic to mains when available. Industrial sites and remote facilities: remote monitoring and control of generator sets using RS485 MODBUS or CANBUS J1939 for centralized management. Mobile or ECUcontrolled generator sets: integrate with engine controllers to monitor engine vitals and perform remote start, stop, and speed management. Technical note Model number HGM4020N. For full use of CANBUS control functions, ensure the connected generator ECU supports J1939 and provides the CANBUS interface. Remote functions via RS485 follow MODBUS protocol.