5 Use and Operation
63
Figure5-2
Add new UPS into parallel system
5.4.5 Redundance Function of Parallel System
When system adopts N+1 redundance design, the total output cannot larger than N times of
single unit's rated power. When one paralleled unit fault, it can put into use or exit parallel
system and do not affect the operation of system, which enhance the system reliability. When
output exceed N times of single unit's rated power, the overload unit (exceeding N/(N+1)
times of single unit's rated power) will send alarm. for example, for the backup system with
two UPS, once one UPS overload for 50% rated power, it will send overload alarm.
5.5 Periodic Preventative Maintenance
To improve the efficiency and reliability of the UPS, perform the following maintenance
regularly:
Clean the UPS by dry cloth regularly. Don't use liquid or spray cleaner. Before cleaning,
shut down the UPS.
Check if the wiring of input and output is firmly and well connected.
Check the working status of cooling fans regularly. Prevent sundries from blocking the air
outlet. If damaged, please replace it in time.
Check the battery voltage and the working status of UPS regularly to discover fault
timely.
5.6 Battery Maintenance
The working life of battery is based on the environment temperature and discharge times.
Using battery in the high temperature for a long time or discharging battery deeply will reduce
the working life of battery.
When selecting battery box, please pay attention to following items:
Charge the battery for 10 hours before using. During charging, the UPS still can be used,
but if power outage at the same time, the discharging time may be less than the standard
backup time.
Summary of Contents for IST9
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Page 54: ...3 Installation 45 Figure3 31 Diagram of 33 mode parallel system wiring of 30kVA 40kVA UPS...
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