Introduction to domestic UPS battery maintenance status and solutions.
According to statistics from UPS manufacturers, more than 95% of UPS batteries
in mainland China are not equipped with monitoring equipment, and more than 90%
of UPS batteries have not undergone necessary maintenance. This has laid a major
hidden danger for future UPS power supply failures. Therefore, the maintenance
of UPS batteries is very important and necessary.
Domestic UPS battery maintenance status
The maintenance of UPS batteries is similar to the maintenance of batteries
in general low-voltage systems. When a new battery is introduced, it requires
project acceptance and deep discharge; when a new UPS battery is put into use,
it is required to maintain a suitable battery working environment temperature
and regularly measure each battery terminal. When the voltage difference between
each battery is too large, equal charging must be carried out. It is required to
conduct exploratory capacity tests or deep discharges on the batteries regularly
in order to check the performance of the battery pack and maintain the activity
of the battery.
However, in actual application, due to various conditions, few people
perform the maintenance of UPS batteries exactly as described above. First, the
acceptance of new batteries takes a long time and there are no convenient tools
to use. Quite a few people do not have it at all. To do this work, the battery
is put into use. According to statistics, more than 95% of UPS batteries in
mainland China lack necessary maintenance, which lays hidden dangers for future
UPS power supply failures. Secondly, after the new battery is put into use, due
to the general UPS battery It is installed in a cabinet, making it inconvenient
to measure and detach. The terminal voltage is rarely measured, and regular deep
discharge is even impossible.
According to the current conditions, all the maintenance personnel can do
is to turn off the mains power every once in a while and let the UPS battery
discharge the actual system for a period of time. At best, it only activates the
battery pack to maintain the activity of the battery, but for the performance of
the battery Important data such as the pros and cons and the remaining capacity
of each battery are still unknown.
UPS battery maintenance solution
1. Power on and off sequence
In order to prevent the UPS from being damaged by the inrush current
generated by the load at the moment of startup, the UPS should be powered on in
bypass mode first, and then turn on the loads one by one, thus avoiding the
impact of the load current on the UPS. The service life of the UPS is extended.
The shutdown sequence can be seen as the reverse process of the startup
sequence. First, turn off the loads one by one, and then turn off the UPS.
2. Before starting up
Before turning on the machine, you first need to confirm whether the
polarity of the input mains connection is correct to ensure personal safety.
Note that the total load power cannot be greater than the rated power of the
UPS. The UPS should be prevented from working in an overloaded state to ensure
that the UPS can work normally.
3. After shutting down
After the mains power is interrupted and the UPS battery pack supplies
power and automatically shuts down, do not use the UPS battery pack to power on
again to avoid battery damage due to excessive discharge. When the mains power
supply is abnormal and the UPS battery pack supplies power, the load should be
turned off immediately and the machine should be turned off again after the
mains power supply returns to normal.
4. Usage environment
Similar to the working environment of a computer, UPS does not have very
high requirements for ambient temperature. It can usually work normally between
0℃ and 40℃. However, dust-proof problems also plague UPS. The usage environment
of UPS requires cleanness, less dust, and dryness. Dust and humid environments
will cause UPS to work abnormally. The UPS battery pack has higher temperature
requirements. The standard operating temperature is 25°C. It is best not to
exceed the range of 15°C to 30°C.
5. Battery maintenance
The UPS battery pack will self-discharge. If it is left unused for a long
time, it will cause damage to the battery pack, so it needs to be charged and
discharged regularly. If you are using a maintenance-free absorption electrolyte
system battery, it will not produce any gas during normal use. However, if the
user uses it improperly and causes the battery pack to be overcharged, gas will
be generated and the internal pressure of the battery pack will increase. In
severe cases, the battery may bulge, deform, leak or even rupture. If users find
this phenomenon, they should replace the battery pack immediately.
6. Pay attention to safety
Since the voltage of the UPS battery pack is very high, there is a certain
risk of electric shock to the human body. Therefore, safety guarantees should be
ensured when loading and unloading conductive connecting strips and output
lines. The tools used should be insulated, especially the output contacts should
be equipped with settings to prevent electric shock.
7. Charging voltage
During the charging process of the UPS, if the charging voltage is too
high, it will cause the battery pack to be overcharged, and vice versa, it will
cause the battery pack to be undercharged. When the charging voltage is
abnormal, battery configuration data may be incorrect. Therefore, when
installing the battery pack, you must pay attention to the correctness of
battery specifications and quantity. Batteries of different specifications and
brands should be avoided as much as possible. It is also best not to use
low-priced and low-quality external chargers.
8. Charging current
Similar to the voltage requirements of UPS, excessive current should be
avoided when charging and discharging the UPS battery pack. Although sometimes
the UPS battery pack can accept a certain degree of high current, it should be
avoided in actual operation. Otherwise, the battery plates will be deformed,
resulting in an increase in the internal resistance of the battery. In severe
cases, the battery capacity will be seriously reduced, resulting in Battery pack
life is significantly shortened.
The above is an introduction to the domestic UPS battery maintenance status
and solutions. Generally, the battery life of a normally used UPS is 3 to 5
years. However, currently, a considerable number of domestic UPS batteries begin
to have problems within one year of being put into use. In this aspect The
reason is mainly due to the lack of necessary maintenance the day after
tomorrow. It is worth noting that many users do not know the health status of
their own system's UPS battery due to the lack of necessary testing and
maintenance methods, leaving hidden dangers for the normal operation of the UPS
system.
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