Maintenance/Checks - EnerSys PowerSafe OPzV Manuel D'installation, D'exploitation Et De Maintenance

COMMISSIONING CHARGE
When commissioning a new battery (first
charge), follow procedure a) or b).
Procedure a) is recommended.
a) IU method (boost charge):
At a raised voltage of 2.33 – 2.40 Vpc.
The charging time will be 12 to 24 hours
depending on the initial charge condition.
The current must be limited to 4 x I
charging must be switched off or switched
over to float charging as soon as the fully
charged state is reached.
b) Float charge:
With a voltage of 2.25 Vpc. Full capacity
will be obtained after a longer period of 4
to 6 weeks depending on state of charge.
STANDBY OPERATION / FLOAT
CHARGE
Float Voltage
The recommended float / charge voltage
is 2.25 V per cell at 20°C (tolerance 2.23
–2.25 Vpc). The charger voltage amounts
to 2.25 Vpc x no. of cells. If the average
ambient temperature deviates more than
± 10°C from the reference temperature
of 20°C, it is recommended to adjust the
float voltage to the following temperature
compensation curve:
Temperature Float voltage
-10 °C 2,37 Vpc
0 °C 2,33 Vpc
10 °C 2,29 Vpc
20 °C 2,25 Vpc
30 °C 2,23 Vpc
40 °C 2,21 Vpc
In case that the average temperature
deviates less than ±5°C, no temperature
compensation has to be applied.
The recommended float charge voltage
is 2.25 volts per cell at 20°C. Following a
commission charge and after 6 months
continuous charge at the recommended
float voltage, individual cell voltages will
stabilise within ±4.5% of the mean applied
voltage.
However, immediately following commis-
sioning and for the initial 6 months of
continuous float charge, individual cell
voltage values outside the above tolerance
may be observed without adverse efect.
There is no relationship between a cell's
float voltage and its discharge capacity.
Cells are prefectly capable of giving their
discharge capacity even when outside the
±4.5% range.
After 6 months service, should any
individual cell show a continuing reduction
or increase in voltage outside the above
limits over 3 successive monthly periods,
our sales department should be contacted
for advice.
Charging Current
Limitation of the charging current is not
required under float charge condition at
2.25 Vpc. At higher charge voltages the
charge current shall be limited to 4 x I
Boost Charge
To reduce the recharge time the battery
may be recharged at 2.33 – 2.40 V per
cell with a current limited to 4 x I
charging must be switched over to float
charging when the fully charged state is
reached.
Ripple Current
In the standby operation mode the effective
value of the A.C. ripple current must not
exceed 5 A/100Ah C10, otherwise reduced
operational life must be expected.
. Boost
10
TEMPERATURE
The recommended operating temperature
range is -10°C to +45°C. The battery will give
best performance and service life when
working in the temperature range of +10°C
to +30°C. Higher temperatures reduce
the operational life. Lower temperatures
reduce the available capacity. Temporary
peak temperatures shall not exceed –30°C
and +55°C. Consideration must be given
to depth of discharge (low temperatures)
and ventilation
All technical data relates to the rated
temperature of +20°C. Do not expose cells
to direct sunlight.
DISCHARGING
End of Discharge Voltage
The battery must not be discharged
more than the capacity specified in the
performance tables. Deeper discharges
may damage the battery and shorten its
operational life. As a general rule the end
of discharge voltage shall be limited to the
values listed below:
Discharge time
1h < t < 5h
5h < t < 8h
8h < t < 24h
Individual cell voltages may fall below UE
by not more than 0.2 Vpc. A low voltage
disconnect is recommended to prevent
deep discharge. Special attention should
be given to small loads that are not
automatically disconnected at the end of
discharge.
Discharged Cells and monoblocs
OPzV batteries must not be left in a
discharged condition after supplying the
load but must be immediately returned to
recharge mode. Failure to observe these
conditions may result in greatly reduced
service life and unreliability.
Accidental Deep Discharge
Following accidental deep discharge, the
battery must be recharged at 2.25 Vpc
followed by an equalizing charge. As the
internal resistance is high at first, the initial
charge current is low.
Important notice:
Each deep discharge is abusive, and could
affect the life expectancy of the battery.
TESTING
Capacity tests are to be carried out in
.
10
accordance with EN 60896-21/22. Check
that the battery is fully charged. Before
testing new batteries it must be ensured
that a sufficient commissioning charge has
been applied
. Fast
10
2
Temperature correction factor
The temperature has an effect on the
battery capacity. The following table shows
the correction factors for temperatures
other than the reference temperature of
20°C.
Discharge
time
5-12 hours 0.60
1-4 hours
RECHARGE
After a discharge the battery can be
recharged at the operating voltage (float
charge voltage). Depending on the depth
of discharge this may take up to 3 days. To
reduce the charging time the recharging
can be carried out with a boost charge
voltage of 2.33 to 2.40 Vpc (fast charge).
The recharging times are dependent on
(high temperatures). the depth of discharge and on the charging
current available. Generally, 10 to 20 hours
duration can be expected at charging
currents between 5A and 40A per 100Ah
C . Fast charging must be switched over
10
to float charging when the fully charged
state is reached.
Equalising charge
Under exceptional circumstances only, e.g.
after deep discharges or after repeated
inadequate recharging, an equalising
charge shall be carried out according to
clause a) of the commissioning charge
paragraph or with the following IUI
characteristic:
End voltage
Charge at increased voltage of 2.33 – 2.40
1.70 Vpc
Vpc, then continue with a constant current
1.75 Vpc
of 1.5 A per 100 Ah C
1.80 Vpc
individual cell voltages can be allowed
to rise to 2.60 – 2.65 Vpc maximum. The
charging must be monitored. The charging
time at constant current shall be 5 to 10
hours.

MAINTENANCE/CHECKS

OPzV batteries are maintenance free,
sealed, lead acid batteries and do not have
to be topped up with water or electrolyte.
The containers and lids should be kept
dry and free from dust. Cleaning must
be undertaken with a damp cotton cloth
without man-made fibres or addition of
cleaning agents. Avoid static discharges
generated during cleaning.
Every 6 months, check the total voltage
at the battery terminals, the cell voltages
of pilot cells and the temperature. Once
a year, in addition to the above, take
readings of individual cell voltages. Keep a
logbook in which the measured values can
be noted as well as power cuts, discharge
tests, etcD. o not attempt to open the
safety valve. Opening could cause lasting
damage to the battery and is prohibited.
SPECIAL APPLICATIONS
Whenever OPzV batteries are to be used
for special applications such as repeated
cycling
conditions please contact your SALES
OFFICE.
For further information please visit our
website: www.enersys.
Temperature in °C
-10 0 +10 +20 +30 +40
0.78 0.90 1.00 1.05 1.07
0.55 0.74 0.88 1.00 1.06 1.08
during which
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or under extreme ambient