Powerware SOLA 4000 manual Operating Modes Parallel and Parallel/Redundant Operation

SOLA 4000 - Operation

4 Operating Modes Parallel and Parallel/Redundant Operation

4OPERATING MODES PARALLEL AND PARALLEL/REDUNDANT OPERATION

4.1 Normal Operation

"Normal Operation" is the standard operating mode of the UPS if the system load is at its nominal value or the system is pro- grammed in a way that all units remain on-line. Otherwise see section 4.2.

•Mains power is present

•The rectifiers convert a.c. power to d.c. power used to charge the batteries and feed the inverters

•The inverters convert this d.c. power to a.c. power used to feed the connected load

•All units are sharing the load current uniformly. This is accom- plished by means of the optional parallel-operation-electronic pcb (IPR).

•All units operate completely independently of each other, each unit supplying its respective share of the load.

4.2 Partial Load Operation

Single inverters that are not needed to supply the load can be switched off automatically, thus saving energy and increasing system efficiency.

•The load is supplied by the remaining inverters

•All rectifiers will continue to operate, charging also the batteries of the units whose inverters have been switched off

•The system can be easily programmed for the minimum number of units which must supply the load at any time.

•When the load is reduced, the units will individually decide which one is to switch off automatically.

•The system may be programmed so that there will always be one redundant unit on-line.

•If the load is again increased, or in the case of an inverter failure, the unit(s) which have been switched off will automati- cally switch on again to share the load.

•If the mains supply fails, all inverters will switch on and connect to the load in parallel operation in order to maximise the battery autonomy time, (see section 4.3)

JUE 401266 64