EnerSys Hawker Instrucciones De Uso página 6

7. Discharge
Be sure that all ventilation holes are not sealed or covered.
Electrical connections (e.g. plugs) must only be made or
broken in the open circuit condition. To achieve the optimum
life for the battery, operating discharges of more than 80% of
the rated capacity should be avoided (deep discharge). This
corresponds to an electrolyte specific gravity of 1.14 kg/l at
30°C at the end of the discharge.
Discharged batteries must be recharged immediately and
must not be left discharged. This also applies to partially
discharged batteries.
It is recommended that the battery is discharged evenly and
the use of tappings across a part of the battery is discouraged.
To overcome this problem a D.C.- D.C. converter must be used
to allow auxiliary loads to be supplied from the whole battery.
Note: The D.C.-D.C. converter must be certified for use in a
zoned area as well as the auxiliary equipment.
Battery performance is directly related to temperature.
Batteries are rated at 30ºC. Where the battery temperature
is lower than this, the available performance is reduced.
Additional capacity is therefore required when the batteries
are to be used in areas of low ambient temperatures (e.g. cold
stores).
8. Recharge
Note: Never recharge an Ex battery in a zoned area.
Only direct current must be used for charging.
All charging procedures in accordance with DIN 41773-1 and
DIN 41774 are permitted. Only connect the battery assigned
to a charger, suitable for the size of battery, in order to avoid
overloading of the electric cables and contacts, unacceptable
gassing and the escape of electrolyte from the cells. In the
gassing stage the current limits given in EN 62485-3 must
not be exceeded. If the charger was not purchased together
with the battery it is best to have its suitability checked by
the manufacturers service department. When charging,
proper provision must be made for venting of the charging
gases. Doors, battery container lids and the covers of battery
compartments must be opened or removed. During the
charge the battery must be removed from the closed battery
compartment on the truck. The ventilation must comply to
EN 62485-3 standard. The vent plugs should stay on the cells
and remain closed. With the charger switched off connect up
the battery, ensuring that the polarity is correct. (positive to
positive, negative to negative). Now switch on the charger.
When charging the temperature of the electrolyte rises by
about 10°C, so charging should only begin if the electrolyte
temperature is below 43°C.
The electrolyte temperature of batteries should be at least
+10°C before charging otherwise a full charge will not be
achieved. The charge is considered as finished when the
specific gravity of the electrolyte and the battery voltage have
remained constant for two hours.
Batteries fitted with electrolyte mixing (option): If the warning
light on the pump controller is illuminated or if a defect signal
on the electrolyte circulation system appears, check that the
piping system is connected and examine the piping circuit for
leaks or defects. (see 6. Maintenance)
The air pipe should never be removed during charge.
Excessive charging reduces battery life, increases water loss
from the battery and wastes electricity. It is important to
ensure that charger gassing times are not extended without
prior consultation from your supplier.
The length of the D.C. cable between the charger and battery
affects the voltage drop back to the control unit of the charger.
The cable should not be extended without prior consultation
with the charger manufacturer and supplier of your Ex battery.
In situations where the battery is generally only very lightly
discharged, it may be an option to recharge the battery at
less frequent intervals, perhaps every second day. In such
circumstances please seek the advice or your local service
engineer.
Do not disconnect battery until the charger has been switched off.
Your local area service centre must approve any managing
charging system otherwise the warranty may be invalidated.
Equalizing
Some chargers have an equalising facility; either a manual
operation or an automatic control.
For full operational procedures
manufactures instruction. But remember never charge an Ex
battery in a zoned area at any time.
Equalising charges are used to safeguard the life of the battery
and to maintain its capacity. They are necessary after deep
discharges, repeated incomplete recharges and charges to
an IU characteristic curve. Equalising charges are carried out
for the charger see
7
following normal charging. The charging current must not
exceed 5 A/100 Ah of rated capacity (end of charge).
Watch the temperature!
9. Measurement of specific gravity
To take a hydrometer reading the bulb is squeezed, the end of
the rubber tube is dipped into the electrolyte and the bulb is
gently released so as to draw up sufficient liquid so that the
float moves freely. The hydrometer must be held in a vertical
position and there should be no pressure on the rubber bulb.
When reading the hydrometer to measure the specific gravity,
the liquid level shows the value on the scale, which is printed
on the float. After reading, the rubber bulb should be squeezed
to return the electrolyte to the cell.
The rated specific gravity (S. G.) of the electrolyte is related
to a temperature of 30°C and the nominal electrolyte level in
the cell in fully charged condition. Higher temperatures reduce
the specified gravity of the electrolyte, lower temperatures
increase it. The temperature correction factor is -0.0007 kg/l
per °C, e.g. an electrolyte specific gravity of 1.28 kg/l at 45°C
corresponds to an S.G. of 1.29 kg/l at 30°C. The electrolyte must
conform to the purity regulations in IEC 62877-2:2016.
10. Temperature
An electrolyte temperature of 30°C is specified as the rated
temperature. Higher temperatures shorten the life of the
battery, lower temperatures reduce the capacity available.
55°C is the upper temperature limit and is not acceptable as an
operating temperature.
The temperature on surface must never exceed 80°C in
explosive area. Charging should only begin if the electrolyte
temperature is below 43°C. If electrolyte temperature reaches
55°C during the charge, wait for the cooling before to use the
battery in the explosive area. If a hot battery is detected it
should be taken out of the controlled zoned area and allowed
to cool to ambient temperature.
An investigation should be carried out into why the battery
is getting hot before it is placed back into service. Possible
reasons why the battery might be getting hot is that there
might be a fault in the equipment that the battery is powering
or a fault could have occurred within the cells of the battery.
In the case of a suspected battery problem contact your local
service centre.
11. Surrounding area conditions
The apparatus is designed to cope with the intended
surrounding area conditions.
12. Effect of explosive atmosphere on materials
The materials selected are not known to react with any
explosive atmospheres to which the apparatus may be
subjected.
13. Protection against other hazards
The apparatus does not cause injury or harm when used as
specified in the installation and operation manual.
14. Hazards arising from different ignition sources
The apparatus does not produce ignition capable electrical
sparks or arcs. The apparatus has also been designed not to
produce potential ignition sources from electromagnetic,
acoustic, optical or other such external energy sources.
15. Withstanding attack by aggressive substances
The individual cells contains sulphuric acid: These cells and
enclosure which make up the apparatus are constructed from
materials that are resistant to acid attack see manufactures
data sheet.
16. Care of the battery
The battery should always be kept clean and dry to prevent
tracking currents. Any liquid in the battery tray must be
extracted and disposed of in the prescribed manner.
Damage to the insulation of the tray should be repaired after
cleaning, to ensure that the insulation value complies with
EN 62485-3. and to prevent tray corrosion. If it is necessary to
remove cells it is best to call in our service department for this.