Operation With Faulty Mains Supply - AEG Protect 5.31 Series Operating Instructions Manual

Protect 5.31/xxx-480-220-120 10 kVA - 120 kVA
5.1.2

Operation with Faulty Mains Supply

SBS
Secured
Mains
circuit
busbar
Q29
_
Loads
~ _
Q29
~
Q29 option
Figure 9 Power circuit with a faulty mains supply
The mains does not sufficiently maintain the supply of the rectifier of
the UPS system. In this case, power is supplied to the inverter from
the charged battery without interruption. The power supply to the
loads is therefore also ensured in the event of a mains failure.
The standby time is limited by the extent to which the batteries are
discharged and is primarily determined by the battery capacity.
The inverter only switches off when the battery voltage drops below
the permissible value.
When the voltage and frequency are within the tolerance range once
more after the mains supply has been restored, the rectifier switches
back on automatically. It then resumes the voltage supply to the
inverter and the charging of the battery.
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