Liebert Emerson NX UPS System - Manual (Page 61)

Operating Procedures
53
6.13 Inserting One Module into a Multi-Module System
This procedure is indicated to reintegrate a UPS module that has been previously isolated from other
modules of a group of paralleled UPS modules. It is assumed that the installation is complete, the sys-
tem has been commissioned by authorized personnel and the external power isolators are open.
1. Open the UPS door to gain access to the main power switches.
2. Rotate the switch to Test position. The LCD display becomes active.
3. Close the Input breaker CB1
The Rectifier indicator flashes on the UPS mimic panel during the startup of rectifier and
becomes steady green once the rectifier reaches normal operation state after about 30s.
4. Close external battery circuit breaker QF1 (where an external battery is used). This breaker is
located inside the battery cabinet (if used) or is otherwise adjacent to the battery racks
5. Following battery availability being detected by the UPS, the red battery indicator extinguishes
moments after when the battery charger starts operation.
6. Rotate switch to Bypass position
7. Turn the rotary switch to NORMAL.
8. Close external output power isolators.
9. Press the INVERTER ON control button for 2 seconds.
The inverter will startup and the inverter indicator will flash while it synchronizes to the load
voltage and frequency. After the inverter is ready, the UPS connects to the load, the inverter indi-
cator becomes steady green and the output indicator becomes green.
10. Check that no “Warning” message is displayed in the top right corner of the LCD Monitor and the
status of the indicators as follows:
The UPS is now operating in NORMAL mode.
!
WARNING
Mains voltage will be applied to UPS output terminals.
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.
# LED LED Function Status
1 Rectifier indicator green
2 Battery indicator off
3 Bypass indicator off
4 Inverter indicator green
5 Output indicator green
6 Alarm indicator off