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NNeutral.
NC Normally close.
NO Normally open.
NEC National Electrical Code.
NFPA National Fire Protection Association.
NO. or No. Part number.
On-line mode Inverter output power is the primary energy source to load.
Off-line mode Inverter output is off, and the load connected at the inverter output receives power
from utility line via a static transfer switch or maintenance bypass relay.
OSHA Occupational Safety and Health Agency.
PCB Printed circuit assembly.
PCB Printed circuit board.
PWM Pulse Width Modulation.
SCR Silicon controlled rectifier.
Shipping damage Any damage done to an article while it is in transit.
SPDT Single Pole Double Throw.
Static Transfer An solid state switching mechanism electronically controlled to pass AC power direct-
ly from the utility to an output load.
Technician Refers to an electronic technician qualified to maintain and repair electronic equip-
ment. Not necessarily qualified to install electrical wiring.
Test connector DB-9 type connector on the LCD panel allowing MGE UPS SYSTEMS Customer
Support Service technician to access programmable and diagnostic features of the
system.
VVolts
VA Volt amperes
VA Volt-amps, unit for apparent power measurement, equal V x I.
VAC or Vac Voltage of AC type.
VDC or Vdc Voltage of DC type.
ve Battery voltage.
Via By way of.
Glossary
page g — 3
Installation and User Manual