Comet installation and user manual: E-6761200XT/FA
12.1
Merlin Gerin by MGE UPS SYSTEMS
glossary
forced shutdown: user-initiated shutdown of the inverter due to incorrect AC
input (Mains 1 or Mains 2) characteristics and resulting in a 0.5 second
interruption in the supply of power.
backup time: the duration over which Comet can supply full rated load without
AC input power. This time depends on the battery.
battery: a number of electrolytic cells connected together to supply electrical
power. The cell electrodes operate in a liquid or gel type electrolyte.
"static bypass": power electronics equipment for switching from one power
source to another without an interruption in supply. Example: transfer from
inverter to bypass line or back.
manual bypass: manual switch enabling supply of power to the load directly
from AC input power during maintenance or servicing.
cubicle: enclosure housing Comet constituent parts (rectifier, charger, inverter,
"static bypass", battery, etc.).
charger: device supplying the battery with DC power to recharge and/or maintain
the battery at the rated charge level.
transfer to inverter: load switching from the "static bypass" to the inverter.
transfer to bypass: load switching from the inverter to the "static bypass".
battery circuit breaker: DC-power circuit breaker that protects the battery circuit
(fused switch for 5 kVA Comet S11 or S31).
low battery shutdown warning: signal indicating the upcoming end of battery
power and the resulting inverter shutdown and interruption in the supply of power
to the load.
powered down: no power is present on Comet circuits (battery circuit breaker
off, upstream circuit breaker off).
rated current In: rated current supplied by Comet (power factor 0.8).
input power switch: switching device installed at Comet input and enabling
rectifier shutdown.
forced operation: user-initiated connection of the load to the inverter with a 0.5
second interruption in the supply of power.
inverter: module that transforms input DC power into a virtually perfect sine wave
(regulated, no-break current).
rated output Pn: apparent power Pn supplied by Comet under given load
conditions (power factor 0.8).
output Pu: apparent power Pu supplied by Comet under given load conditions. It
is less than or equal to the rated output Pn. The ratio Pu/Pn defines the Comet
load level.
rectifier: device drawing from the power required by Comet from the AC input
source. The AC input power is transformed (rectified) into DC power.
Mains 1 (AC input power): primary source of power for the rectifier and the
inverter.
