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9 Glossary
9.1 Technical terms
AVR Automatic Voltage Regulation
against mains voltage variations
DC/DC Booster Circuit technology to boost the direct voltage
on a higher voltage level
EPO E
mergency Power Off
device for emergency shut down
PFC P
ower Factor Correction
Circuit technology to minimize circuit
backfeed (important for non linear loads)
Appliance protection Surge technology term
The conventional mains surge protection
consists of an mains earthwire (class B),
an overvoltage protection (class C) and an
appliance protection (class D) – see also
e.g. under http://www.phoenixcontact.de
(topic „TRABTECH“)
Class D see appliance protection
LED L
ight Emitting Diode
Electronic semiconductor component,
commonly called light diode. Used for optical
signaling.
SNMP S
imple Network Management Protocol
common protocol in networks to manage /
control appliances
VFD Output V
oltage and Frequency Dependent
from mains supply
The UPS output depends of mains voltage
and frequency variations. Former notation:
OFFLINE
VI Output V
oltage Independent from mains supply
The UPS output is independent of mains
voltage and frequency variations. The mains
voltage however is rectified by electronic /
passive voltage regulators. Former notation:
LINE-INTERACTIVE
VFI Output V
oltage and Frequency Independent
from mains supply
The UPS output is independent of mains
voltage and frequency variations. Former
notation: ONLINE