Operation Modes - Elen B1 Series User Manual

3.3 Operation Modes

The B1 Series UPS has Online Double Conversion UPS and Three-Level Inverter
technologies. Three-Level Inverter Technology ensures that UPS operates at high
efficiency. The B1 Series UPS supports following operation modes.
Bypass Mode
Mains voltage is transferred to output via bypass line and over bypass/inverter unit.
Bypass operation is used for supplying the UPS from the mains voltage in case of any
malfunctions. In case of malfunction or warning, bypass line will be used and
malfunction will not affect the load. Meanwhile batteries are not charged or battery
capacity will not diminish (discharge). Once mains voltage is interrupted, output voltage
will also interrupt.
Normal Mode
Rectifier and inverter units operate. A mains-independent, stable voltage and frequency
is generated and transferred to output via bypass/inverter unit. Batteries are charged as
appropriate.
Battery Mode
When mains voltages and frequencies are out of tolerance limits, rectifier unit does not
operate. Inverter unit operates on batteries and supply the output voltage from batteries.
A stable voltage and frequency is generated and transferred to output via
bypass/inverter unit.
Manual Bypass Mode
This is the operation mode that is used to separate the UPS from input energy and
supply the loads from the mains voltage in case of a maintenance or malfunction (please
see '3.2 Switching Off' and Figure 3.15 for details).
The input and the battery CBs must be switched off while the UPS
operates in manual bypass mode.
If the UPS will be operated in manual bypass mode without switching
off the loads, it must be operated in bypass mode at first. Later,
manual bypass CB must be switched on, and the output, the battery
and the input CBs must be switched off in respective order (Figure
3.15).
Figure 3.14
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B1 10kVA V1.0.1 –