User Manual 10H52192UM60 - Rev. 1 - 09/2011 49
Operating Instructions Liebert NX
6.2.2 Procedure for Startup Without Input Supply
1. Verify that the battery is connected correctly.
2. Close the internal and/or external battery circuit breakers (internal QS6 and QS7).
3. Close the output switch QS4.
4. Press the battery start button (see Figure 6-3) on the front panel of any power module.
At this point, the LCD starts up and the battery indicator starts flashing green. After the rectifier has operated normally for 30
seconds, the green battery indicator remains on (not flashing).
电池启动按钮
Battery start button
Figure 6-3 Location of Battery Start Button
Note
After step 4, if any of the following conditions occur, disconnect the battery. The system can be started up one minute later.
EPO action
Fault in system commissioning
5. Press and hold the INVERTER ON button on the operator control and display panel for 2 seconds; the UPS begins to operate in
battery mode.
6. If the UPS is to switch from battery mode to normal mode when the mains power supply is restored, the input switches QS1 and
QS2 must be closed.
6.3 Procedures for Transfer Between Operating Modes
6.3.1 Transfer from Normal Mode to Battery Mode
Open the mains input switch QS1 to transfer the UPS to battery mode.
To transfer the UPS back to normal mode, wait for several seconds, then close the mains input switch QS1 to reconnect the mains
power to the UPS. 10 seconds later, the rectifier restarts feeding power to the inverter automatically.
Note
If the battery voltage drops to the EOD voltage, the load will be transferred to bypass (precondition: Bypass input switch QS2 is closed
and the bypass voltage is as in the specification). In bypass mode, the load is fed directly by the mains power instead of the pure AC
power from the inverter.
6.3.2 Transfer from Normal Mode to Bypass Mode
When the UPS is in normal mode, if the INVERTER OFF button on the operator control and display panel is pressed, the UPS is
transferred from normal mode to bypass mode.
Note
In bypass mode, the load is fed directly by the mains power instead of the pure AC power from the inverter.
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