SNR UPS-ONRT-25-INTXL33 Инструкция онлайн [12/53] 747431

SNR UPS-ONRT-25-INTXL33 Инструкция онлайн [12/53] 747431
Installation Instruction
8 HR33 Rack Mounted UPS 25KVA User Manual
while simultaneously FLOAT or BOOST charging its associated backup battery. The
Normal mode structure is shown in Fig.2-4.
Rectifier
AC/DC
Inverter
DC/AC
Charger
DC/DC
Bypass Input
Battery
Load
Static Switch
Main Input
Fig 2-4 Normal mode operation diagram
2.3.2 Battery Mode
Upon failure of the AC mains input power, the inverter of UPS, which obtain power
from the battery, supply the critical AC load. There is no interruption in power to the
critical load upon failure. After restoration of the AC mains input power, the” Normal
mode” operation will continue automatically without the necessity of user
intervention. The Battery mode structure is shown in Fig.2-5.
Rectifier
AC/DC
Inverter
DC/AC
Charger
DC/DC
Bypass Input
Battery
Load
Static Switch
Main Input
Fig 2-5 Battery mode operation diagram
Note
With the function of Battery cold start, the UPS may start without utility. See more detail in
section5.1.2.
2.3.3 Bypass Mode
If the inverter overload capacity is exceeded under Normal mode, or if the inverter
becomes unavailable for any reason, the static transfer switch will perform a transfer
of the load from the inverter to the bypass source, with no interruption in power to the
critical AC load. Should the inverter be asynchronous with the bypass, the static
switch will perform a transfer of the load from the inverter to the bypass with power
interruption to the load. This is to avoid large cross currents due to the paralleling of
unsynchronized AC sources. This interruption is programmable but typically set to be
less than 3/4 of an electrical cycle, e.g., less than 15ms (50Hz) or less than 12.5ms

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