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NO. or No. Part number.
NO Normally open.
Online mode Inverter output power is the primary energy source to load.
Offline 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.
PCA Printed circuit assembly.
PCB Printed circuit board.
P.F. Power Factor.
PWM Pulse Width Modulation.
Rectifier/Charger Converts the AC input voltage from the utility source into DC voltage, supplying the inverter and
regulating the charge of the battery system.
SCR Silicon controlled rectifier.
Shipping damage Any damage done to an article while it is in transit.
S-M Single-Module.
SPDT Single Pole Double Throw.
SSC Static Switch Cabinet (in shared systems).
Static Transfer Switch A solid state switching mechanism electronically controlled to pass AC power directly from the
utility to an output load.
Sync or synch Synchronization.
Technician Refers to an electronic technician qualified to maintain and repair electronic equipment. 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.
Test/Maintenance Mode Maintenance bypass circuit breaker is closed and system output circuit breaker is open.
UPS Uninterruptible power 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.
Glossary
3.5 to 21 kVA N+1 Inverter
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