Chapter 1 Product Introduction
2
HSTP3T 15/20KE-C/KEBC-C User Manual
1.2.2 Battery Mode
Upon failure of the AC mains input power, the inverter of power modules, 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.
Fig.1-3 Battery mode operation diagram
1.2.3 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 (60Hz). The action of
transfer/re-transfer can also be done by the command through monitor.
Fig.1-4 Bypass mode operation diagram
1.2.4 Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load
when the UPS becomes unavailable e.g. during a maintenance procedure. (See Fig.1-5).
Summary of Contents for HSTP3T15KE-C
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