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4. Overview
This uninterruptible power supply is designed to provide reliable and stable AC power to
critical equipment that requires continuous uninterrupted power.
This UPS system consists of 2 to 5 based 1kVA UPS Unit connected in parallel. According to
this configulatin, when customer system requires greater power capacity due to load expansion,
this UPS system capacity can be easily expanded by installing the additional UPS Units in the
range from 2 to 5 kVA.
Moreover, This system has a high reliability for uninterruptible power supplying to be able to
configure a N+1 operation for the "1-4kVA" load.
The UPS Unit consists of rectifier, charger, inverter, battery and utility power transfer (bypass)
circuits. In the event of failure of the AC source (utility power), inverter operation is
sustained by converted DC power supplied from the batteries. When the utility power recovers,
inverter operation continues while the battery is recharged. The UPS system is therefore able
to supply completely uninterruptible AC power to connected loads without so much as a
moment of power loss.
If a fault occurs in an inverter or the UPS output is overloaded, the output automatically
switches the source of AC power to the bypass circuit, without interruption, the utility power is
supplied to connected loads.
This UPS system consists of the basic 1 kVA UPS Unit including the batteries, up to 5 unit, and
UPS Power Distribution Unit.