Emerson U /400/S/12P, 400KVA Auto-restart mode, Bypass mode, Maintenance mode, Source Share mode

Chapter 1 General Description 5

Auto-restart mode

The battery becomes exhausted following an extended AC mains failure. The inverter shuts down when the battery reaches the end-of-discharge voltage (EOD). The UPS can be programmed to Auto Recovery after EOD after a set variable delay time. This mode and any delay time are programmed by the commissioning engineer.

Bypass mode

The load power is supplied though the mains static bypass line. This may be considered as an intermediate operating condition being utilized for the purpose of load transfers between inverter and maintenance bypass or supply under abnormal operating conditions.

Maintenance mode

The UPS is shut down but the load is connected to the unprotected mains through the maintenance bypass supply line.

Source Share mode

The UPS has the capability of fully supporting their critical load while limiting the amount of power taken from the incoming AC mains supply. Any balance of power required is supplied by the UPS battery. This feature is useful, for example, in applications where peak-hour tariffs apply or where a generator smaller than needed feeds the UPS during mains outages. The Source Share mode is user-activated and the ratio of the mains AC input power is programmable from 20% to 100% of the rated UPS power.

ECO mode (for single UPS only)

All power switches and the BCB are closed, the system prefers to put the load on the bypass mains, with the inverter on stand-by; only when the voltage and/or frequency of the bypass supply are beyond pre-defined and adjustable limits is the critical AC load transferred to the inverter.

Parallel redundancy mode (system expansion)

For higher capacity or higher reliability or both, the outputs of up to six UPS modules can be programmed for directly paralleling while a built-in parallel controller in each UPS ensures automatic load sharing.

Frequency converter mode

The UPS can be programmed into Frequency Converter mode for either 50Hz or 60Hz stable output frequency. The input frequency may vary from 45Hz to 65Hz. In this mode, it is required to open the bypass switch to disable the static bypass operation, and the battery becomes optional depending on any requirement to operate in Battery mode.

HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual