Definitions; Operation Overview - Toshiba G2020 Series Installation And Operation Manual

3.1

DEFINITIONS

UNINTERRUPTIBLE POWER SYSTEM (UPS) – All components within the UPS Module Cabinet and associated
batteries that function as a system to provide continuous, conditioned AC power to a load. This is sometimes referred
to as the "System".
UPS MODULE CABINET – The metal enclosure which contains the Converter / Charger, Inverter, Static Transfer
Switch, Internal Bypass line, operator controls, and internal control systems required to provide specified AC power to
a load.
UPS MODULE – The Converter / Charger and Inverter assemblies which, under the direction of the internal control
system and operator controls, provide specified AC power to a load.
INVERTER – The UPS components which contain the equipment and controls necessary to convert DC power from
the Converter / Charger, or the battery, to AC power required by the critical load.
CONVERTER / CHARGER – The UPS components which contain the equipment and controls necessary to convert
input AC power to regulated DC power required for battery charging and for supplying power to the Inverter.
STATIC TRANSFER SWITCH – The device which connects the critical load to the bypass line when the Inverter
cannot supply continuous power.
BYPASS LINE – The line which conducts electricity directly from the input power source to the critical load during
Maintenance or whenever the UPS is not completely operational.
AC INPUT POWER – Power provided by the electrical utility company, or auxiliary generator, which is connected to
the UPS for supplying the critical load.
BATTERY – The rechargeable battery strings which supply DC power to the inverter to maintain continuous AC power
to the load during AC input power failure conditions.
3.2

OPERATION OVERVIEW

The UPS provides two power paths between the utility source and the critical load.
Figure 3-1 shows the path for normal operation, with the load powered by the inverter.
Figure 3-2 shows the path for bypass operation, with the load supplied through the static bypass line.
Figure 3-3 shows the path for battery operation, with the load powered by the inverter.
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G2020 Series UPS Installation and Operation Manual – 94861-004