Automatic Transfer Switch Controller with Backlit LCD A versatile ATS controller designed for reliable transfer and management between two power sources, including combinations of mains and generators. Clear local display, comprehensive protection and measurement functions, flexible scheduling, and remote communication make it suitable for industrial, commercial, and remote power systems. Key benefits Reliable automatic transfer and protection: protects equipment and prevents downtime with phase, voltage and frequency protections plus automatic reclosing. Flexible source pairing and operation modes: supports any combination of mains and generator for both inputs and allows automatic or manual control with direct forceopen and forceclose in manual mode. Local visibility and secure onsite control: backlit graphic LCD and pushbutton operation let technicians view measurements, alarms and settings on site; twolevel password access restricts configuration to authorized staff. Remote monitoring and integration: isolated RS485 with ModBus protocol enables remote control, remote measurement and integration with building or plant monitoring systems. Wide power range and rugged inputs: broad DC supply range and AC input tolerance reduce installation constraints and improve compatibility with diverse systems. Key functions and features Configurable input types: set system type to Mains (1) and Mains (2), Mains (1) and Generator (2), Generator (1) and Mains (2), or Generator (1) and Generator (2). Display and operation: backlit 128 by 64 LCD with optional Chinese and English menus; pushbutton operation for parameter editing and navigation. Electrical measurements: measures and displays twoway threephase voltage and frequency, active power, apparent power, power factor and threephase current. Protection and alarms: overcurrent alarm plus overvoltage, undervoltage, loss of phase, reverse phase sequence, and overfrequency and underfrequency protection. Transfer control: automatic and manual modes; manual mode supports forced close or open commands; automatic reclosing function available. Output control options: closing output configurable as timed pulse intervals or continuous output. Neutral and ATS compatibility: compatible with singleneutral, twoneutral and changeover ATS arrangements; supports two isolated neutral lines for generator and mains. Scheduling and testing: realtime clock for timed events; monthly and weekly schedules; timed trials configurable as onload or offload. Genset cycling: can manage two generators in rotation with programmable run time and crank rest intervals. Local configuration and security: all parameters settable on site; dual password levels ensure only authorized staff can change settings. Event logging: circular log of up to 99 events with timestamps. Power and input tolerances: DC power supply 8 V to 35 V nominal; can withstand transient DC up to 80 V; alternatively can be powered by HWS560 module with AC input 85 V to 560 V and DC output 12 V. AC input and terminal layout: wide terminal spacing for AC inputs and rated maximum input voltage up to 625 V. Communications: standard isolated RS485 interface supporting ModBus for remote controlling, remote measuring and remote communication. Typical applications Commercial building backup power: automatic transfer between utility and standby generator, scheduled weekly or monthly generator exercise, event logging and remote monitoring for building management systems. Industrial facilities and manufacturing plants: protection against phase loss, reverse phase sequence and voltage excursions while allowing manual override during maintenance and automatic reclosing after transient faults. Remote sites and distributed generation: manage two generators in rotation for fuel and runtime balancing, support isolated neutral arrangements, and provide secure local control with remote telemetry over RS485. Installation and operation notes All parameters are configurable on site through the front panel; ensure authorized personnel use the twolevel password to modify settings. Use the configurable closing output mode to match actuator or breaker requirements, either pulse intervals or continuous drive. When using the HWS560 power module, connect AC input within 85 V to 560 V range to obtain 12 V DC supply for the controller. This ATS controller combines comprehensive protection, flexible control modes, secure onsite configuration and standard ModBus communications to support a wide range of transfer and generator management applications.