Installation36
The “Parallel” parameters for each UPS in the system must be set and synchronized at rst start-up.
To start and set parameters for the parallel system:
1. Make sure that the output MCBs of all units in the parallel system are open, then close the input MCB 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 rectier start-up to nish, 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 page
52, 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
validate the settings. For a full description of UPS display functions and settings, see Operation and Display
Panel on page 43.
3. After conrming the parallel parameters and each UPS is operating normally, commission the parallel system,
see Commissioning Parallel System below.
2.8.2. Commissioning Parallel System
CAUTION:
When powering-on the parallel system, conrm that the external output MCB for each UPS is closed and that all of
the inverter output is connected in parallel.
CAUTION:
To avoid load power failure, conrm that the system is working normally, then feed power to the load.
To commission the parallel system:
1. Close the external output MCB and input MCB on each UPS, then wait about 30 seconds to allow the rectier
start-up 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 inverter-output voltage and verify that it is normal.
3. Repeat step 2 for each UPS in the parallel system.
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