Leonics Ulta Series, User Manual

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2.2.2
Op
er
a
ting under back
up mo
de
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2.2.1 Operating in the normal mode
Normally, UPS is working under line interactive mode in which the path of
current is as follows : When the current first flows into the UPS, it has to pass
through a surge protection circuit to filter surges and spikes which may occur
from a nearby lightning discharge or load switching by the local power
company. Here, the high voltage power will go to the line grounding system
and let only the acceptable current pass to the EMI/RFI filter to eliminate EMI
and RFI. Then it flows to the automatic voltage regulator (AVR) to regulate the
voltage level to approximately your country's standard nominal mains voltage
(see product specification, 100, 110, 120, 220, 230 or 240 Volts). If the voltage is
too high or too low compared to the standard nominal voltage, it will be
adjusted to the safety level for your loads (please refer to the specifications).
After that the current will flow to two destinations. The first part goes to the
EMI/RFI attenuation then to the Power Watcher and to your connected loads.
The Power Watcher provides information about load conditions, whether or
not you are overloading your ULTRA Series UPS. (Power Watcher is continuously
monitoring in real time both for the stabilizer and inverter modes.) The
remaining power flows to the battery charger circuit to charge the batteries
and maintain them fully charged.
2.2.2 Operating under backup mode
The UPS will transfer to backup mode (inverter mode) when it detects
abnormal situations such as blackouts, brownouts, surges, sags or abnormal
frequency. These situations may harm your loads and may be too risky for the
UPS to operate in the interactive mode. When an abnormal power mode is
detected, the UPS will Immediately transfer to the backup mode with no loss of
power to the loads. At this moment, the backup power will begin to be drawn
from battery. The current from the battery will flow to the inverter (changing
direct current to alternating current). Then, the power flows to the EMI/RFI
attenuation, Power Watcher and on to your loads.
You can also monitor the UPS from a PC by using Easy-Mon X Monitoring and
Management Software through a connection between the PC and the UPS
communication port. For instance, you can set the UPS shutdown time and restart time,
this status will be displayed on your PC monitor.