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Chapter 3 Operating Procedures 23

Liebert APM Modular UPS User & Installation Manual

3. Open the input switch and output switch.

Caution

1. The load is not protected from normal supply aberrations when the UPS is operating in maintenance bypass mode.

2. After the UPS is transferred to maintenance bypass, the power modules and bypass module are inoperative and the LCD has

no display, only the green indicator of the input surege protective device (SPD) shows the UPS has mains input, but the output

terminals corresponding to closed output distribution switches and the neutral bars are energized.

3.4 Powering Down The UPS

To power down the UPS completely, follow the procedures in

3.3.4 Transfer From Normal Mode To Maintenance

Bypass Mode

to transfer the UPS from normal mode to maintenance bypass mode.

To completely isolate the UPS from the AC supplies, open the external power input isolator.

3.5 Emergency Shutdown Procedures

The Emergency Power Off (EPO) switch on the UPS operator control and display panel is designed to switch off the

UPS in emergency conditions, for example, fire, flood, and so on. The system will turn off the rectifiers, inverters and

stop powering the load immediately (including the inverters and bypass), and the battery stops charging or

discharging.

If the mains input is present, the UPS control circuit will remain active; however, the output will be turned off. To

remove all power from the UPS, the UPS input switch should be opened.

3.6 UPS Reset Procedures

After UPS shutdown due to an EPO action, inverter over temperature or overload, battery overvoltage, excessive

transfer, and so on, once all appropriate measures have been taken to correct the problem indicated by the alarm

message appearing on the LCD, carry out the following reset procedures to restore the UPS to normal operation

1. Press the FAULT CLEAR key to let the system exit the emergency off state.

2. Press and hold the INVERTER ON key for two seconds.

Note

1. The rectifiers will start again, and the bypass will begin to power the load. The Rectifier indicator flashes while the rectifiers are

starting up. When the rectifiers enter the normal operation state (about 30 seconds), the rectifier indicator turns solid green.

2. The rectifiers will turn on automatically when the overtemperature fault disappears five minutes after the disappearance of

overtemperature signals.

3. After the EPO switch is pressed, if the mains input is removed, the UPS will shut down completely. When the mains input

returns, the UPS will start up on bypass. There will be power at the output terminals of the UPS.

3.7 Selecting Display Language

The UPS provides two LCD languages for your selection: English. and Chinese

Carry out the following procedures to select the language:

1. From the Output menu, press the F3 or F4 (left or right) key as needed to select the Language menu.

2. Press the F5 (enter) key to move the cursor to the data window on the screen.

3. Use the F3 or F4 (up or down) key to select the required language.

4. Press the F5 (enter) key to accept the language selection.

5. Return to the Output menu by repeatedly pressing the F2 (ESC) key as needed; all text on the LCD will now be

displayed in the selected language.

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