Ups Self-Test Procedures; Ups Shutdown Procedures; Procedures For Completely Powering Down Ups; Procedures For Completely Powering Down Ups While Maintaining Power To Load - Liebert NXC 30kVA User Manual

5.5 UPS Self-test Procedures

During the self-test, the UPS can check the UPS control functions, LED indicators and audible alarm states. This
self-test is password controlled and menu driven. It can be carried out from the UPS operator control and display panel
by the operator and takes five minutes.
Procedures for UPS self-test
1. Select the Command menu on the LCD screen.
Use the F3 (left) key or F4 (right) key to display the Command menu. Press the F5 (enter) key to confirm it.
2. Select the desired test.
Use the F3 (up) key or F4 (down) key to highlight the desired test item. Press the F5 (enter) key to confirm it.
After the prompt, use the F3 (up) and F4 (right) keys to input the password, and then press the F5 (enter) key to
confirm it.
3. Wait until the test completes.
After five seconds, a pop window will appear to show the result of this diagnosis: rectifier, inverter, monitor OK or fault.
4. Stop the test.
If required, the test may be stopped before completion by selecting Stop testing on the Command menu.
Refer to Chapter 4 Operator Control And Display Panel for more information.

5.6 UPS Shutdown Procedures

5.6.1 Procedures For Completely Powering Down UPS

Complete UPS shutdown and load power-off should follow this procedure. All power switches, isolating switches and
breakers are disconnected, and then UPS no longer supplies power to load.
The following procedures will cut off the load power, making the load completely power off.
1. Pressing the EPO button stops the operation of rectifier, inverter, static switch and battery.
2. If the UPS has internal battery, use the special tool to open the battery compartment door, then pull the three
terminals 'BAT+', 'BAT-' and 'BAT N' (see Figure 5-3 for details). If the UPS has external battery, disconnect the
corresponding switch of the external battery.
3. Disconnect the rectifier input switch Q1, bypass input switch Q2, output switch Q5. At the moment, all the internal
power supply is closed and the LCD does not display any more.
1. Post a label at the AC input distribution (generally far away from the UPS) to alert that the UPS maintenance is being operated.
2. Wait 10 minutes for the internal DC bus capacitance discharging. Then the UPS is completely shut down.
1. After the UPS shutdown, the load is transferred to maintenance bypass. If required, operate the maintenance bypass switch at
any time.
2. Only qualified personnel shall finish the UPS installation. This procedure can be executed after the system runs normally.
The battery terminals still have hazardous voltage after the UPS is completely shut down.

5.6.2 Procedures For Completely Powering Down UPS While Maintaining Power To Load

The following procedures are applicable for completely powering down the UPS and still keeping the power supply to
the load. Refer to the procedures in 5.3.4 Transfer From Normal Mode To Maintenance Mode.
Warning: hazardous battery voltage
Liebert NXC 30kVA And 40kVA UPS User Manual
Chapter 5 UPS Operation Introduction
Caution
Warning
Note
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