AEG PROTECT A. 500 9 List of Terms, 9.1Technical Terminology

AVR	Automatic Voltage Regulation
	Automatic voltage regulation against mains
	voltage deviations
DC/DC booster	Circuit technology for increasing a DC voltage
	to a higher voltage level
EPO	Emergency Power Off
	Device for emergency shutdown
PFC	Power Factor Correction
	Circuit technology for minimising system
	disturbances (particularly important when
	connecting non-linear loads)
Appliance protection	Term from overvoltage technology
	Classic mains overvoltage protection consists
	of a lightning surge arrester (Class B),
	overvoltage protection (Class C) and, finally,
	what is referred to as appliance protection
	(Class D) – see also
	http://www.phoenixcontact.de (“TRABTECH”
	topic) for example
Class D	See appliance protection
LED	Light Emitting Diode
	Electronic semi-conductor component,
	commonly referred to as an LED, used for
	optic signalling.
SNMP	Simple Network Management Protocol
	A protocol encountered frequently in networks
	for managing / handling components
VFD	Output Voltage and Frequency Dependent
	from mains supply
	The UPS output is dependent on mains
	voltage and frequency fluctuations. Earlier
	designation: OFFLINE
VI	Output Voltage Independent from mains
	supply
	The UPS output is dependent on mains
	frequency fluctuations, but the mains voltage is
	prepared by electronic / passive voltage
	control units. Earlier designation: LINE-
	INTERACTIVE
VFI	Output Voltage and Frequency Independent
	from mains supply
	The UPS output is independent from mains
	voltage and frequency fluctuations. Earlier
	designation: ONLINE