53
EN
12 Appendix
12.1 Glossary (technical terms)
AVR
Automatic Voltage Regulation
against mains voltage deviations
Class D
See device protection
DC/DC booster
Circuitry for increasing a direct voltage to a higher
voltage level
Device protection
A term from overvoltage technology
The classical mains overvoltage protection is
comprised of a lightening current arrester (Class B),
overvoltage protection (Class C) and the so-called
device protection (Class D)
ECO
Measure for system efficiency optimisation
Efficiency Corrective Optimiser
EPO
Device for emergency switch-off
Emergency Power Off
LED
Light Emitting Diode
Electronic semiconductor component used for
visual signaling.
PFC
Power Factor Correction
Circuitry for minimising feeding back to the mains
(especially important in the connection of non-
linear loads)
SNMP
Simple Network Management Protocol
Frequently encountered protocol on the network
for managing components
VFD
Output Voltage and Frequency Dependent from
mains supply
The UPS output depends on the mains voltage
and frequency fluctuations. Previous designation:
OFFLINE
VI
Output Voltage Independent from mains supply
The UPS output depends on mains frequency
fluctuations, but the mains voltage is processed
via electronic/passive voltage regulation units.
Previous designation: LINE-INTERACTIVE
VFI
Output Voltage and Frequency Independent from
mains supply
The UPS output is independent of the mains
voltage and frequency fluctuations. Previous
designation: ONLINE