Operator Control and Display Panel
Liebert
®
APM
™
94
9.11.4 Screen Saver Window
If there has been no interaction with the Liebert APM’s LCD for 2 minutes, the screen saver window
appears. It remains on the LCD for 2 minutes, then the screen will go dark. The LCD will become
active again when any key is pressed.
Figure 79 Screen saver window
9.12 Pop-Up Windows
Pop-up prompt windows appear when the user must confirm a choice or perform an operation. This
section describes the pop-up windows. Some operations require entering a password; refer to
for help.
9.12.1 From Bypass to Inverter Mode With Power Interruption
If the bypass voltage or frequency exceeds the synchronized range and
utility voltage or frequency is normal, the inverter cannot be in
synchronization with the bypass, and the output can only transfer to
inverter after an interruption of about 15ms when the user presses the
INVERTER ON button. Before transferring, the system will let the
user confirm whether the interruption can be accepted, as shown at right. If the bypass voltage
returns to normal before the user makes confirmation, the UPS will transfer to inverter mode
automatically. At the same time, the prompt window will close.
9.12.2 From Inverter to Bypass Mode With Interruption
If the bypass voltage or frequency exceeds the synchronized range and
the UPS is in inverter mode, the system must let the user confirm and
accept the power interruption danger before pressing the INVERTER
OFF button to shut down the output of the inverter. The user can also
cancel the shutdown operation, as shown at right. If the bypass voltage
returns to normal before the user makes the confirmation, the UPS
will transfer to bypass operation mode automatically, and at the same time the prompt window will
disappear soon.
F1
F2
F3
F4
HELP
F1
F2
F3
F4
HELP
Single
APM 090kVA
0 2:1 7: 47
EMERSON
™
Network Power
Press any key back to main menu
Transfer with Interrupt,
please confirm or cancel
This operation leads to
output shutdown,
Confirm or cancel