LEVELUPS SERIES 10-20 KVA
PRODUCT DESCRIPTION
AG-SD-83 / Publication Date: 15.09.2014 / Rev. No: 0 / Rev. Date:
2.2.3 Bypass Mode
In case when UPS is overloaded or if inverter cannot generate a quality AC output due to any
problem and if bypass voltage and frequency values are within the limits, the loads will be fed
from the static bypass source (mains). UPS without interruption switches from inverter to AC
source (mains) via static transfer switches. The inverter source and mains must be synchronized
in order to manage smooth switching. If inverter output and mains are not synchronized,
switching may take up to 15 msec, varying according to load type.
2.2.4 Auto Restart Mode
In case of any failure of the mains, UPS will continue feeding the critical loads until the batteries
will reach the end of discharge voltage level. UPS will be working until the batteries are drained
and then will shutdown. When mains are restored to normal conditions UPS automatically will
start its operation, in the period determined by the user. UPS continues to operate in normal
(online) mode as long as the mains values are within desired limits. For LevelUps Series, this
feature is not activated in the initial factory set-up.
2.2.5 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.
2.3 Battery Management
Lead-acid batteries are used.
2.3.1 Normal Operation Mode
Constant Charge Current
Constant current at 1/10 rate of the battery capacity is applied to battery, until it 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.
Deep Discharge Protection
While the system is operating in the battery mode, if battery voltage has dropped below the
discharge level UPS shuts down and stops taking energy from the batteries. This value varies
between 1.6-1.75 V/cell for Lead-Acid batteries, and between 0.9-1.1 V / cell for Ni-Cd batteries.