APC Network Management Card AP9619 Manual de usuario descargar pdf (Pagina 18)

14 Smart-UPS® VT ISX 20-30 kVA, 208/220/480V Operation 990-2819

Operation Modes

In a stand-alone installation, the UPS has four different operating modes.

Normal operation

During normal operation, the UPS converts utility power to conditioned power for the connected load.

Battery operation

During battery operation, the UPS provides power to the connected load from its internal and (if

applicable) external batteries for a finite period. The UPS transfers to battery operation if the supply

of utility power fails, or is outside pre-defined limits.

Bypass operation (or static bypass operation) utility

Static bypass operation can either be obtained by user request or automatically, as the UPS will

switch into bypass operation if both the normal and battery operation modes are unavailable. During

static bypass operation, the utility power is sent through internal Radio Frequency Interference (RFI)

filters to the connected load, bypassing the internal power converters. The UPS transfers to bypass

operation following a command received via the user display, or after a short or heavy overload on

the output of the UPS. Battery back-up is not available in bypass operation.

Mechanical bypass

In mechanical bypass, utility power is sent directly to the connected load through a mechanical

breaker, bypassing all internal UPS functions and filters. Mechanical bypass is obtained by the

operation of the mechanical bypass breaker lever located behind the front cover. Mechanical bypass

is a feature designed to keep the load supplied with utility power at maintenance of the power

sections of the UPS. All major maintenance operations can be performed with the UPS running in

mechanical bypass, and with the load being supplied directly with unconditioned utility power.

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APC Network Management Card AP9619 Manual de usuario Pagina 18