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Tab. 5: Nominal electrolyte specific gravity
Tubular design
OPzS
HUTCE
OPzSC
HVTCE
TL-TV
HYTCE
TY-TZ
HNTCE
Vb
OP
Pasted design
OPC
OPS
OPSC
Nominal S.G.
1.240kg/l
1.250kg/l
at 20°C
Electrolyte
Max
Medium
level
Float voltage
2.23 V/c
2.23 V/c
at 20°C
Tab. 6: S.G. values according to electrolyte
level (at 20°C in kg/l)
Tubular positive plate cells
TYPE
Minimum
Medium
OPzS-OPzSC
1.260
1.250
TL-TV-TY
1.280
1.260
TZ
1.265
1.250
Pasted positive plate cells
TYPE
Minimum
Medium
OP-OPC-
1.265
1.250
OPS-OPSC
Vb
1.260
1.250
UPS H
1.300
1.290
NOMINAL LEVEL
Correction of S.G. according
to temperature
Electrolyte S.G. varies with temperature.
If temperature is above or below 20°C,
specific gravity readings must be corrected.
The temperature correction factor for S.G.
is –0.0007 per °C.
Example: S.G. of 1.230 kg/l at +35°C
corresponds to a S.G. of 1.240 kg/l at
+20°C.
DISCHARGING
End of Discharge Voltage
The battery must not be discharged more
than the capacity specified in the perform-
ance tables. Deeper discharges may dam-
age the battery and shorten its operational
life. As a general rule the end of discharge
voltage shall be limited to the values listed
below:
Tab. 7: end voltages
Discharge time
5 min < t < 59 min 1.60 V/c
1h < t < 5h
5h < t < 8h
8h < t < 24h
UPS H
Individual cell voltages may fall below UE
by not more than 0.2 V/c. A low voltage
disconnect is recommended to prevent
deep discharge. Special attention should be
1.280kg/l
given to small loads that are not automati-
cally disconnected at the end of discharge
Max
Discharged Cells
2.25 V/c
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.
Important notice:
Each deep discharge is abusive and could
Maximum
affect the life expectancy of the battery.
1.240
TESTING
1.240
Capacity tests are to be carried out in
accordance with EN 60896-1. Check that
1.240
the battery is fully charged. Before testing
new batteries it must be ensured that a suf-
ficient commissioning charge has been
applied, the S.G. is relating to the nominal
value (± 0.01 kg/l) and the battery is fully
charged. Lower S.G. results in lower capac-
Maximum
ity.
1.235
RECHARGE
After a discharge the battery can be
1.240
recharged at the operating voltage (float
1.280
charge voltage).
To reduce the charging time the recharging
can be carried out with the boost charge
voltage of 2.33 to 2.40 V/c. The recharging
times depend on the charging procedure
and on the charging current available.
Generally 10 to 20 hours duration can be
expected at charging currents between 5 A
and 40 A per 100 Ah nominal capacity.
Recharge 1.2 times the discharged capacity.
During recharging up to 2.40 V/cell the
effective value of the A.C. ripple current
can reach a temporary maximum 10 A per
100 Ah nominal capacity.
Equalising Charge
After a deep discharge or after inadequate
recharging, an equalising charge is neces-
sary. This can be carried out as follows:
a) at constant boost charge voltage of
2.33 – 2.40 V/cell for a maximum of
72 hours.
b) with I charge method according to the
commissioning charge paragraph
above, clause b).
If the maximum temperature of 45°C is
exceeded, charging must be terminated or
End voltage
continued at a reduced current or tem-
porarily switched to float charging. The end
1.70 V/c
of equalising charge is reached when the
1.75 V/c
S.G. of the electrolyte and the cell voltages
1.80 V/c
have not risen for a period of 2 hours.
Because the permissible system voltage
level may be exceeded when charging at
increased voltages, suitable measures
should be taken to protect the load circuits,
e.g. charging «off line».
MAINTENANCE/CHECKS
Water topping
Top up the electrolyte level to the nominal
level, but without exceeding the « Max »
mark. Only demineralised or distilled water
(purity grade: max. conductivity 10 μS/cm)
shall be used.
After topping-up an equalising charge can
be applied to reduce the time for homoge-
nization of the electrolyte density.
Cleaning
Keep containers and lids 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.
Plugs
Wash plugs (about every 2 years) in clean
water and dry them before putting them
back on the battery.
Readings – Log book
Every 6 months, check the total voltage at
the battery terminals. Also check the volt-
age, S.G., and the temperature of pilot cells
and record the room temperature.
Once a year, in addition to the above, take
readings of individual voltages and S.G. of
the electrolyte. Measure the S.G. either
before topping up water or after boost
charge.
Keep a logbook in which the measured val-
ues can be noted as well as power cuts, dis-
charge tests, equalising charges, topping up
dates, storage times and conditions, etc.
SPECIAL APPLICATIONS
Whenever the battery cells or monoblocs
are to be used for special applications such
as repeated cycling or under extreme ambi-
ent conditions please contact your SALES
OFFICE.
For further information please visit our
website:
www.enersys-emea.com
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