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(1-10kVA) UPS IST3
User Manual
4.4.3 Remove Faulty UPS from Parallel System
When one UPS failure, it will remove from parallel system automatically with sound & light
alarm. Now, perform the operations shown in 0 to remove the faulty UPS from parallel system
completely to achieve online hot maintenance or replacement.
Remove faulty UPS from parallel system
4.4.4 Add New UPS into Parallel System
When it has to add one or more UPS into parallel system, perform the operations shown in 0.
When the added UPS works steadily, it will add into parallel system automatically for share
current.
Add new UPS into parallel system
4.4.5 Redundancy Funciton of Parallel System
When adopting the N+1 redundancy backup design, the total output load should be less than N times of
rated load of single UPS. If there has a faulty UPS, it will remove form parallel system automatically,
which doesn't influence system running and enhances system reliability. When the output load is more
than N times of rated load of single UPS, the overload unit (more than N/(N+1) times of rated load of
single UPS) will have an alarm. e.g. For the parallel system with two UPS, when the load of UPS is more
than 50%, it will have overload alarm.
4.5 Periodic Preventative Maintenance
To improve the efficiency and reliability of UPS, perform the following maintenance regularly.
Clean UPS regularly by dry cloth. Don't use liquid or spray cleaner. Before cleaning,
shut down UPS.
Check if the wiring in the input and output are firmly and connect well.
Check the working status of cooling fans regularly. Prevent sundries from blocking the
air outlet. If any damage, please replace it in time.
Check the battery voltage and the working status of UPS regularly.
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