Appendix 1 Glossary 75
Liebert APM 90 Integrated Modular UPS User Manual
Appendix 1
Glossary
AC Alternating
current
BCB
Battery circuit breaker
CSA Cross
sectional
area
CT Center
tap
DBS
Dual bus system
DC Direct
current
DIP dual
in-line
package
DSP
Digital signal processor
EMC Electromagnetic
compatibility
EOD End-of-discharge
EPO
Emergency power off
IGBT
Integrated gate bipolar transistor
LCD Liquid
crystal
display
LBS Load
bus
synchronization
MCB
Miniature circuit breaker
MCCB
Moulded-case circuit breaker
PE Protective
earth
PWM
Pulse width modulation
RCCB
Residual current circuit breaker
RCD
Residual current detector
SCR Silicon-controlled
rectifier
STS
Static transfer switch
SVPWM
Space vector pulse width modulation
UPS Uninterruptible
power
system
VRLA Valve-regulated
lead-acid