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dB Decibels.
dBA Decibel Adjusted.
DC or dc Direct current, or voltage.
Digital Meter The LCD display on the front panel of inverter system.
Earth ground A ground circuit that has contact with the earth.
Electrician Refers to an installation electrician qualified to install high-energy electrical components in
accordance with national and local codes and regulations. Not necessarily qualified to
maintain or repair electrical or electronic equipment. Compare to Technician.
EPO Emergency Power Off. Used to switch all UPS/critical power OFF. For emergency power
shutdown only.
Frequency slew rate The change in frequency per unit of time. Given in term of Hz per second (Hz/sec.).
GND Electrical ground.
Hz Hertz, frequency measurement unit, 1Hz is one cycle per second.
Inverter mode See “on-line” mode.
I Current.
IEC International Electrotechnical Commission.
IEEE Institute of Electrical and Electronic Engineers.
Input branch circuit The input circuit from the building power panel to the equipment.
Inverter An electrical circuit that generates an AC voltage source from a DC voltage source.
IGBT Insulated gate bipolar transistors.
I/O Input/Output.
I/T or IT Information Technology.
KVA KiloVolt-Ampere; is equal to 1000 Volt-Ampere.
KW True power. Kilo-Watt = 1000 Watt.
L Line.
LCD Liquid-Crystal Display.
LED Light Emitting Diode.
Mains or Mains 1 Main AC input source.
Mains 2 Bypass AC input source.
mA Milliampere.
MAX. Maximum.
MCM Thousand circular mil; standard wire sizes for multiple stranded conductors over 4/0 AWG
in diameter. M is from Roman numerical system indicating 1000.
Galaxy 4000
GlossaryG — 2 86-173010-00 A00