3.8.1 First Time Start-up of a Parallel System
IMPORTANT! Do not start the UPS until after the installation is finished, the system is commissioned by an authorized
engineer, and the external input circuit breakers are closed.
CAUTION: Starting the UPS applies mains/utility power to the output terminals. Make sure that the load
power is safe and ready to accept power. If the load is not ready, isolate the load with the output terminal.
The Parallel parameters for each UPS in the system must be set and synchronized at first start-up.
To start and set parameters for the parallel system:
1. Make sure that the output circuit breakers of all units in the parallel system are open (off), then close (turn on)
the input circuit breaker on each UPS. Each UPS powers on, a self-check screen displays, and the alarm/run
indicators are lit for about 5 seconds.
2. Wait about 30 seconds to allow the rectifier start-up to finish, then at each UPS, set the parallel parameters as
follows:
NOTE: If the Parallel Comm Fail Alarm displays, clear it and proceed. Communication should not fail after the parallel
settings are synchronized.
• On the display, press Enter to display the Main Menu, then use the arrow buttons to select Settings, and press
Enter.
NOTE: To adjust the settings, you must enter a password. See Editing Display and Operation Settings on page54, for
details on entering the password and editing the setting parameters.
• Use the arrow buttons to select the Parallel tab, then press Enter to display the parameters list.
• Select and Enter each parameter setting, and then use last item in the list, Sync parallel parameters, to copy the
settings to the other units in the system. For a full description of UPS display functions and settings, see
Operation and Display Panel on page37.
3. After confirming the parallel parameters and each UPS is operating normally, commission the parallel system, see
Commissioning Parallel System below.
3.8.2 Commissioning Parallel System
CAUTION: When powering-on the parallel system, confirm that the external output circuit breaker for each
UPS is closed and that all of the inverter output is connected in parallel.
CAUTION: To avoid load power failure, confirm that the system is working normally, then feed power to the
load.
To commission the parallel system:
1. Close the external output circuit breaker and input circuit breaker on each UPS, then wait about 30 seconds to
allow the rectifier startup to finish.
2. At the first 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.
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Vertiv™ Liebert® GXT5 UPS Installer/User Guide
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