NOTE: If you would like to have more information regarding the parallel operation, contact supplier or service center
for detail parallel operation instruction.
3. Remove units from the parallel system:
a. Go to the CONTROL Page of the Display of the Unit that you would like to remove from the Parallel System
and press Exit Parallel. Then press Yes.
b. At this moment the Inverter of that UPS will be switched OFF. The load will still be supplied from the other
UPSs in the Parallel system in Line Mode.
c. Put in OFF position the Output switch, Bypass Input Breaker and Line Input Breaker of the UPS to be
removed from the Parallel system.
4. How to transfer the Parallel System from Line Mode to External Maintenance Bypass:
a. Go to CONTROL page of each UPS and select UPS on/off icon. The screen will show Turn off UPS?. Select
Yes on each UPS.
b. After that the command has been given to all the UPSs, they will transfer to Bypass Mode simultaneously.
c. Put in ON position the External Maintenance Bypass Breaker.
d. You can put in OFF position the Output switch, Bypass Input breaker and Line Input breaker of all the
UPSs. The load is supplied from the External Maintenance Bypass.
5. How to transfer the Parallel System from External Maintenance Bypass to Line Mode:
a. Put in ON position the Line Input breaker, Bypass breaker and Output switch of all the UPSs in parallel. The
fans will start running and the LCD Display will be turned ON.
b. Verify on each UPS that they are running in Bypass Mode.
c. Put in OFF position the External Maintenance Bypass.
d. Go to CONTROL page of each UPS and select UPS on/off icon. The screen will show Turn on UPS?. Select
Yes on each UPS.
e. After that all the UPSs have received the Turn ON command, they will Turn ON simultaneously.
Following warnings are applicable only for the Parallel System:
WARNING! Before turning on the parallel system to activate inverter, make sure that all unit’s maintenance
switch are in off position.
WARNING! When the parallel system is turned on, do not operate the maintenance switch of any unit. But use
an external maintenance bypass.
WARNING! The parallel system DOES NOT support ECO mode. Therefore, DO NOT enable ECO mode in any
unit.
74 Proprietary and Confidential ©2024 Vertiv Group Corp. 3 Operations
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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