9 Glossary
9.1Technical 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 | Emergency Power Off |
| device for emergency shut down |
PFC | Power 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 | Light Emitting Diode |
| Electronic semiconductor component, |
| commonly called light diode. Used for optical |
| signaling. |
SNMP | Simple Network Management Protocol |
| common protocol in networks to manage / |
| control appliances |
VFD | Output Voltage and Frequency Dependent |
| from mains supply |
| The UPS output depends of mains voltage |
| and frequency variations. Former notation: |
| OFFLINE |
VI | Output Voltage 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: |
| |
VFI | Output Voltage and Frequency Independent |
| from mains supply |
| The UPS output is independent of mains |
| voltage and frequency variations. Former |
| notation: ONLINE |
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