Emerson 160, U/300/S/12P, U /400/S/12P, U/300/S/6P, U /400/S/6P, 400KVA ECO Mode For Single UPS Only

Chapter 1 General Description 3

Return of power mains

When the mains returns within the required tolerance, the rectifier will start up again automatically and gradually (power walk-in), supplying power to the inverter and recharging the battery at the same time. There will be no interruption of the critical load.

Off-battery

If the battery system only is taken out of service for maintenance, it is disconnected from the rectifier/charger and inverters by means of (an) external disconnect breaker(s). The UPS shall continue to function and meet all of the specified steady-state performance criteria, except for the power outage back-up time capability.

UPS module fault

In the event of an inverter fault, the static transfer switch will automatically transfer the load onto the bypass mains with no interruption. In such an event, seek technical assistance from Emerson local customer service center.

(“1+N” parallel UPS system) In the event of a fault in a unit, the unit’s static transfer switch will automatically exclude the unit from the system. If the system is still capable of providing the required load, the remaining units will continue to supply the load with no interruption. When the units still present in the system are no longer capable of fulfilling power requirements, the load will automatically be transferred onto the bypass mains.

Overload

In the event of an overload at the inverter output which lasts longer than the typical time/current (refer to table 8-6), the inverter will shut down and the static transfer switch will automatically transfer the load onto the bypass mains with no interruption. If the overload falls within the typical time/current that has been specified, the load will be returned to the inverters when the power drops to a level which can be supported by the number of active units in the system (parallel “1+N”).

In the event of a short circuit in the output, the load will normally be transferred onto the bypass mains, which will cause the inverter to shut down. This switch is determined above all by the features of the protective devices in use in the system.

In either case, an alarm message will appear on the operator control and display panel of the UPS.

(“1+N” parallel UPS system) The control logic system constantly monitors load requirements and controls the power supplied by the UPS modules. In the event that an overload condition is sustained for greater than a preset time, the load will transfer to the bypass mains supply, when the number of active modules is unable to satisfy load requirements. The load returns to the inverter supply if the power is reduced to a value that can be sustained by the number of active modules in the system.

Maintenance bypass

A second bypass circuit contained in the UPS cabinet, identified as the maintenance bypass line, is included to enable a raw mains supply to be made available to the load while facilitating a safe working environment for carrying out scheduled UPS system maintenance or trouble shooting. The circuit is manually selected by the maintenance bypass switch in the OFF position.

Warning

The internal maintenance bypass must not be used when the UPS system is comprised of more than two UPS modules in parallel.

CAUTION: If an automatic circuit breaking device is not present in the input distribution panel, there remains a dangerously high voltage at the output busbars and also on the input busbars of the UPS module that is switched off.

1.2.4 ECO Mode (For Single UPS Only)

In ECO mode, the system prefers to put the load on the bypass mains, with the inverter on stand-by. The load is switched over to the inverter when the mains goes outside of standard frequency and voltage values (settable).

The ECO mode configuration requires a different setup in the default menu configuration.

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