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6.2
Comet installation and user manual: E-6761200XT/FA
Merlin Gerin by MGE UPS SYSTEMS
operation (cont')
battery duration
During an AC input power failure, the duration of inverter operation on battery
power depends on:
■ the rated capacity of the battery;
■ the power drawn by the load;
■ the battery temperature;
■ the age of the battery.
The rated backup time corresponds to a minimum for a new battery and with the
inverter operating at the rated load.
The real backup time, which depends on the power drawn, may be greater if the
inverter operates at less than full rated load. It is possible, during operation on
battery power, to increase the battery backup time by reducing the power drawn
by the load (shedding of non-priority circuits).
Comet has a battery monitoring function that calculates the remaining backup
time. This function may be implemented with a communications option.
A low battery shutdown warning signal is available via the standard
communication connector 15 for remote indications. It warns the user of
upcoming battery shutdown at a user-determined level of remaining power.
On the UPS itself, the buzzer 17 beeps louder and more rapidly, and the
orange "battery status" light 20 flashes.
The end of battery power occurs when the battery is fully discharged. At this
point, the inverter 7 shuts down.
The recharge time required to restore the battery to its rated backup power varies
between 4 and 16 hours depending on the Comet model.
When the AC input power failure ends or power returns to within tolerances:
■ if the end of battery backup power was not reached, Comet returns to the
operating status described above (figure 19);
■ if the end of battery backup power was reached, the rectifier 2 , the
charger 6 and the inverter 7 automatically start up (the inverter must be
manually started if the system is in manual start mode).
load
AC input
5
7
6
2
3
Fig. 20
return of AC input power