Powerware SOLA 4000 manual Operating Modes, Sola 4000 Operation, General

SOLA 4000 - Operation

1 Operating Modes

1 OPERATING MODES

1.1 General

There are four different operating modes of the standard stand- alone on-line UPS-system (5 for hot-standby and 6 for parallel systems), ensuring uninterrupted power supply of the load under all conditions. Transitions between these operating modes are per- formed without interruption of the power supply to the load.

Security concept • In "Normal Operation" any failure, internal or external, will transfer the UPS system either to "battery operation", to "by- pass operation" for a stand-alone UPS or to "operation with an inverter failure" for parallel and hot-standby systems.

•In "Battery Operation" or "Bypass Operation", with a stand- alone UPS system, an additional failure may interrupt the power supply to the load, depending on the kind of failure. In both operating modes the UPS signals a failure condition (audible and visual alarm) to indicate that any additional failure bears the risk of interrupting the power supply to the load.

•As additional security, a second UPS unit may be added and connected in parallel with the original unit, in a hot-standby configuration. Therefore, in the case of a failure of one inverter, the second inverter will take over the load. This system re- quires the occurrence of 3 or 4 simultaneous failures (the bypass can be also redundant) before the load is interrupted. Any number of units can be connected together in this way, the addition of each unit providing the addition of 1 or 2 additional security factors. The interconnection of the SOLA 4000 in this way requires a special cable available from your local distribu- tor.

•Parallel Operation is used to provide redundancy in the same way as for hot-standby units above and / or an increased capacity to supply the load, the parallel units exactly sharing the load requirement.

•"Maintenance Bypass Operation" is used to supply the load directly from mains during maintenance or repair work.

Warning: Even in case of a total blackout, the UPS will continue to supply power to the load, therefore all necessary precautions against direct and indirect accidental contact as specified in na- tional and local safety standards must be followed.

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