Uninterruptible Power Supplies Minipower Plus Rack User Manual

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Uninterruptible Power Supplies Minipower Plus Rack User Manual Manual pdf 21 page image

UPS313-01-00 MINIpower PLUS (Rack) User Manual, Dated 01-08-06 4-34.4 Operating ModesThere are three main operating modes• Mains operation• Battery operation• Bypass operation4.4.1 Mains OperationThis is the normal operating condition:• The mains supply is converted to DC by the power factor corrector• The inverter reconstructs a sinusoidal voltage from the DC supply• The output filter provides smoothing of the output voltage• The batteries are continually charged4.4.2 Battery OperationWhen there is a mains power failure, the UPS automatically switches overto battery mode.• The voltage of the batteries is increased by the “booster” circuit• The inverter constructs an alternating voltage from the battery DCsupply• The output filter provides smoothing of the output voltage4.4.3 Bypass OperationThe bypass circuit excludes the UPS and connects the input directly to theoutput. The switchover takes place in a synchronised manner to ensure thecorrect output voltage is always supplied, preventing the risk of a break inpower or excess voltage.Operation of the by-pass circuit can be customised, to meet the specificdemands of the application, by means of a dedicated menu (Config. UPS,By-pass) which provides many options (automatic, disabled, by-pass inload waiting mode, etc.) in order.