Section VI
Glossary
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DC BOOSTER –
A UPS power section. Its function is to boost the rectifier DC link voltage to a level
required by the inverter for normal operation.
DC LINK –
DC voltage output of the rectifier and booster input to the inverter. Is maintained by a
battery bank during a power outage.
DIGITAL SIGNAL PROCESSOR (DSP) –
The “brain” of the control logic system.. Receives and analyzes data, and provides
control and monitoring for the UPS.
EMERGENCY POWER OFF (EPO) –
A means of cutting power from the UPS in emergency situations. The EPO switch is
located on the Monitor Panel.
EQUALIZE –
See RECHARGE.
FLOAT CHARGE –
A dc voltage applied to a battery at a level which maintains the battery in a fully charged
state.
HERTZ (Hz) –
The measure of electrical frequency in cycles per second.
INVERTER –
A major component of the UPS. Its primary function is to change DC to AC.
LED –
Light emitting diode. A semiconductor that give off light when it is energized.
LOGIC CIRCUIT –
A network of electronic components that performs a specific function.
OUTAGE –
Loss of UPS input or bypass power.
PHASE LOCK –
A condition in which the inverter output is frequency and phase synchronous with the
utility ac source.
PHASE SEQUENCE –
The order in which the fundamental components of a polyphase set of voltages/currents
reach a particular value.
