Section VI
Glossary
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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.
REAL POWER (kW) –
The portion of apparent power which actually performs work or generates heat.
RECHARGE –
A dc voltage applied to a battery for a given period of time which will equalize unevenly
charged cells. After an emergency discharge, it will restore the batteries to full charge.
RECTIFIER/CHARGER –
A major component of the UPS. Its primary function is to change AC to DC for the
inverter input. It also supplies current to recharge or maintain the charge of the batteries.
REMOTE ALARM CONTACTS –
Relay switch/contact arrangement which opens or closes in response to an alarm
condition within the UPS. The contacts are connected to terminals which are easily
accessible to the customer. They provide the ability to remotely sense an alarm
condition.
STATIC BYPASS SWITCH (SBS) –
A major component of the UPS. Connects the UPS Input to the load if the rectifier
and/or the inverter become unavailable or unacceptable.
TRANSFER –
A static bypass switch operation which exchanges load power sources from the UPS to
utility power.
UPS –
Uninterruptible power system. UPS are online units which deliver power to the critical
load from the inverter on a full-time basis. A power outage does not require load
switching manually since the battery instantaneously takes over to supply dc power to the
inverter. Due to the ac to dc to ac conversion, most UPS units offer superior ac transient
noise suppression.
WYE OUTPUT –
A wiring configuration. Wye utilizes four wires to furnish a neutral. The output of the
UPS is a WYE configuration.
