APC Network Management Card AP9619 Manual de usuario descargar pdf (Pagina 23)

990-2819 Smart-UPS® VT ISX 20-30 kVA, 208/220/480V Operation 19

Load Connection

At the rear, the UPS contains at least one Distribution Units (PDU). As standard, one PDU is installed

on the left side seen from the rear. In addition, a second PDU may be installed on the right side. The

PDU has 6 breaker sets. The top breaker set operates as a unit and protects any 3-phased equipment

that may be connected to the PDU. This breaker unit (must be toggled) will switch ON/OFF all 3

phases when operated (may supply several loads). Each of the 5 other breaker sets protects the 5

single-phased outlets (L1, L2, L3) beneath the actual breaker set. The top breaker in each of these 5

single-phased outlets protects L1, the middle breaker protects L2, and the bottom breaker protects L3.

Connecting the load to the PDUs

Note

Connect the load evenly between the 3 phases to avoid overloading the PDU. The total

output capacity of the PDU is approximately twice the output capability of the UPS.

This means that UPS would be over-loaded if all PDU outlets were loaded to their

rating. Load status on the individual phases can be found through the UPS display or

through the web interface.

Note

Equipment connected to the 3-phased output may require overcurrent protection with a

lower rating than the 3-phased output.

Note

The L21-20 outputs must be connected to single-phased loads only as they are

designed with separate overcurrent protection for each phase.

Note

For 3-phased output, the highest current may be in the Neutral conductor at non-linear

loads (up to 173%) and may trip the breaker.

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APC Network Management Card AP9619 Manual de usuario Pagina 23