User Manual 10H52258UM60 - Rev. 3 - 01/2019
64
APM 400/600
Battery
severe injury.
•
Clean the battery enclosure with a damp cloth. Do not use a dry cloth or dry duster to clean batteries. Avoid
using organic solvents, such as gasoline or volatile oil to clean batteries as it may result in cracking of the battery
enclosure. There is a remote possibility that using a dry cloth or duster may cause fire.
•
The UPS batteries contain diluted sulfuric acid. In regular use, the sulfuric acid will be absorbed by the battery
baffle and polar plates. However, if the batteries are damaged, the acid may leak from them. Therefore, protective
equipment (such as protective glasses, rubber gloves, and apron) must be used by the personnel while installing,
operating or handling batteries. Utmost care must be taken while operating the battery as the diluted sulfuric
acid may cause blindness if it comes into contact with eyes. If it comes in contact with the skin it may cause
burns.
•
When batteries reach the end of their working life, they may short circuit or be affected by electrolyte dry-up,
or positive pole erosion failure. If they are still used in this state there is a risk of a thermal runaway, bulging, or
liquid leakage.
•
Isolate the battery charger power connection before connecting or disconnecting the battery connection
cables.
•
Check and whether the battery has been earthed, if so, remove the earth connection. Contact with any part of
the earthed battery may result in an electric shock.
7.3
UPS batteries
The UPS generally uses valve-regulated batteries. Valve regulated batteries are also known as sealed type or
maintenance–free batteries. In reality, valve regulated batteries are not completely sealed; especially in an
over-charged state or if the pressure exceeds the safety limits, they will produce excess gases that are allowed to
escape in order to maintain the pressure at safe levels (hence the name "valve regulated battery"). The volume of
the gas generated is less than that produced by a water-injected battery. when designing the battery installation
area it is important to take temperature increases into account and ensure that there is enough space to allow
adequate ventilation.
Another factor for consideration is that the valve-regulated batteries are not entirely maintenance-free. They
must be kept clean and inspected on a regular basis. The connections must be checked and inspected for signs
of corrosion.
For more information see the Battery Maintenance section.
No more than 4 strings of batteries should be connected in parallel. All batteries used in the same system must
be identical (same manufacturer, same model, same age). This will ensure will prevent battery inconsistency,
which, in turn, can lead to some batteries being over-discharged, or under-charged. Eventually this will cause
premature failure and affect backup time of the entire set of batteries.
Batteries must be fully charged before they are placed in storage. Since they lose a certain amount of their
capacity due to self-discharging during the transportation or storage, batteries must be recharged before use.
During storage, ensure that the ambient temperature remains between -15 °C and +45°C. The ideal temperature
range is between 20 °C and 25 °C.
During storage, charge the batteries every 3 months to compensate for any self-discharging. For more
information, refer to the specification indicated by the battery manufacturer.
It is important to ensure the batteries are fully charged before carrying out the on-site battery backup time test.
This test may take several days, therefore it should be conducted after the batteries have been subjected to
uninterrupted float charging for a period of at least one week.
To avoid the over-charging or under-charging the batteries, set-up the battery management parameters
depending on the float charge voltage and temperature compensation factor specified in the manuals provided
by the battery manufacturers. It is also important to ensure that batteries are recharged immediately after they
have been discharged.
7.4
Safety considerations when designing the battery installation environment
The precautions and safety measures that should be implemented when installing, handling and servicing
batteries are covered in the respective battery manuals provided by the battery manufacturers. The safety
measures mentioned should be considered mandatory during the installation process. Locally applicable
protocols and regulations must be taken into account when designing the installation environment.
7.5
Battery Installation Environment