Liebert Vertiv GXT5 - Chapter 4: Operation and Display Panel

Vertiv | Liebert® GXT5™ | Installer/User Guide 45
2.8.2. Commissioning Parallel System
CAUTION
When powering-on the parallel system, conrm that the external output CB for each UPS is closed and that all of the
inverter output is connected in parallel.
CAUTION
To avoid load power failure, conrm that the system is working normally, then feed power to the load.
To commission the parallel system:
1. Close the external output CB and input CB on each UPS, then wait about 30 seconds to allow the rectier
startup to nish.
2. At the rst UPS, press the power button for 2 seconds and note that the run indicator (green) is lit, then
measure the output voltage and verify that it is normal.
3. Repeat step 2 for each UPS in the parallel system.
2.8.3. Adding a Single UPS to the Parallel System
CAUTION
When adding or replacing a UPS in the parallel system, make sure that all parallel- cabling is correct before powering on
the additional/replacement unit.
• You may also use this procedure when replacing a faulty UPS in the system. The dierence is noted in
the procedure steps.
1. Connect the power cables and parallel-communication cables, and make sure that they are properly
connected, without any short-circuits.
2. Refer to Commissioning Parallel System above, to verify operation of the added unit then completely
power-o the added UPS.
3. At any other UPS in the system, update the parallel parameters as follows:
• On the display, press Enter to display the Main Menu, then use the arrow buttons to select Settings, and
press Enter.