MY-A Series (10kVA-20kVA) UPS
User Manual
6 Use and Operation
89
6.4.4 Redundance Function of Parallel System
When system adopts N+1 redundance design, the total output cannot larger than N times of single
UPS's rated power. When one paralleled UPS 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 UPS's rated power, the overload UPS (exceeding N/(N+1) times of single UPS'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.
6.5 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.
6.6 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 built-in battery model, 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.
Generally, charge and discharge the battery once every 4 to 6 months. Discharge the battery till
under-voltage and power off and then charge it. In high temperature area, charge and discharge
the battery once every 2 months. The charging time for the standard battery should be more than
10 hours every time.
If the UPS hasn't been used for a long time, it is recommended to charge the battery more than 10
hours every three months.
