ATS

In Suntree Automatic Transfer Switches (ATS), "Normal Power" refers to the preferred power supply under normal conditions, typically connected to the utility grid. "Emergency Power" is the alternative power source that automatically engages when the normal power fails, typically connected to a generator or a secondary utility line. For wiring, the normal and emergency power sources are connected to two independent input terminals of the ATS. The ATS uses mechanical and electrical interlocking mechanisms to ensure that both power sources are never connected simultaneously, with the output terminal connected to the load.

Some models use microcontroller control, while others use relay control, depending on the specific model and specifications.

the ATS controller continuously monitors the normal power (utility) status. When the utility voltage or frequency falls outside preset thresholds, the ATS controller sends a start signal (typically a dry contact signal) to the generator set to start the generator. After the generator output voltage stabilizes, the ATS performs transfer switching to transfer the load to generator power. When utility power returns and stabilizes for a set period, the ATS switches back to utility power and sends a stop signal to the generator.