SECTION VI
Glossary
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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 poly-phase set of
voltages/currents reach a particular value.
POWER FACTOR -
The ratio of real power to apparent power. Equal to the cosine of the phase angle
between the current and voltage for sinusoidal voltages and currents.
