OPTI-UPS MD120L - Manual (Page 37)

34 Chapter 3 Operating Instructions
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The load power is supplied by bypass. In the meantime, the rectifier starts up, rectifier indicator goes
green 30s later, at this time, the inverter will start up automatically, and transfer to inverter mode 1 min
later automatically.
3. Close external battery switch, the battery indicator goes off. Check if the battery voltage on LCD
display is normal.
3.4 Procedure for Completely Powering down a UPS
If you need to power down the UPS completely, follow the procedures in section 3.3.4 to transfer the
UPS from normal mode to maintenance bypass mode.
If you need to isolate the UPS from the AC power supply, you should open the external input switch.
3.5 EPO Procedure
The EPO button on UPS operator control and display panel is designed to switch off the UPS in
emergency conditions (e.g., fire, flood, etc.).To achieve this, just press the EPO button, and the system
will turn off the rectifier, inverter and stop powering the load immediately (including the inverter and
bypass output), and the battery stops charging or discharging.
If the input utility is present, the UPS control circuit will remain active; however, the output will be
turned off. To completely isolate the UPS, you need to open the external mains input supply to the UPS
rack.
3.6 Language Selection
The LCD is available in two languages: Chinese, English and a kind of optional language. (Korean,
Russian, Turkish and Traditional Chinese)
The language can be selected through LCD prompt window.
3.7 Control Password
When the LCD display s “input control password 1”, the initial password is 12345678.