SNR UPS-ONRT-200-25CMX33 [10/69] Working modes

2.4. Working Modes

The Modular UPS is an on-line, double-conversion UPS that permits operation in the

following modes:

 Normal mode

 Battery mode

 Bypass mode

 Maintenance mode (manual bypass)

 ECO mode

 Auto-restart mode

 Frequency Converter mode

2.4.1. Normal mode

The inverter of power modules continuously supply the critical AC load. The rectifier/charger derives power from

the AC mains input source and supplies DC power to the inverter while simultaneously FLOAT or BOOST

charging its associated backup battery. As Figure 2- 3 shows

Figure 2- 3 UPS conceptual diagram in normal mode

Note

Indicates the energy flow direction.

2.4.2. Battery Mode

Upon failure of the AC mains input power, the inverter of power module, which obtain power from the battery,

supply the critical AC load. There is no interruption in power to the critical load upon failure. After restoration of

the AC mains input power, the “Normal mode” operation will continue automatically without the necessity of user

intervention. As Figure 2- 4 shows.