AEC IST5 Series, Service Manual

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2.9.5 Maintenance Mode
On the maintenance mode loads are switched to the maintenance bypass line with a breaker, so
that the UPS can be serviced without cutting off the power to loads. The breaker is in full
conformity with capacity of loads.
2.10 Battery Management
Lead- acid batteries are used with UPSs.
2.10.1 Normal Operation Mode
Constant Charge Current
Constant current at 1/10 rate of the battery capacity is applied to battery, until reaches the float
voltage.
Float Charge
Depending on the battery discharge current the 1/3 of the battery energy is charged at this level.
With this level of charging batteries are kept ready for use at maximum capacity. For lead-acid
batteries, this voltage varies between values 2.2-2.35 V/cell. This voltage may differ slightly with
temperature adaptation. Option of setting this coefficient is provided with our UPS, we
recommend using the temperature sensor.