On exceeding the maximum temperature of 55°C,
charging must either be stopped or proceed with
reduced current or be switched to float charge to allow
the temperature to drop. The equalising charge is
completed when the electrolyte densities, and the
single cell voltages no longer increase within 2 hours.
2.6 Charging Currents
The charging current is not limited until the battery
voltage has reached the gassing voltage of 2,40V x
number of cells. Thereafter the charging current has to
be limited:
Limits on charging currents above 2,40V x number
of cells per 100Ah nominal capacity
Charging
Process
charging
current
Cell
Voltage
I-Characteristic 5.0 A 2.60 - 2.75 V/c
W-Characteristic 7.0 A
3.5 A
at 2.40 V/c
at 2.65 V/c
During recharging up to 2.40 V/cell the effective value of
the AC ripple current may reach temporarily maximum
20 A / 100 Ah nominal capacity. After recharging and at
float charge in standby operation or buffer operation the
effective value of the AC ripple current must not exceed
5 A / 100 Ah nominal capacity.
2.7 Battery temperature
All technical data apply for the nominal temperature of
20
o
C. The ideal operating temperature range is 20
o
C ±
5 K. The recommended operating temperature range is
10
o
C to 30
o
C. Higher temperatures reduce the working
life. Lower temperatures reduce the available capacity.
Exceeding the temperature limit of 55
o
C is not
permissible.
2.8 Temperature-related charging voltage
A temperature-related adjustment of the charging
voltage within monthly averaged battery temperatures of
10°C to 30°C is not necessary. Below 10°C in the
monthly average the charging voltage should be
increased (-0,005V/K per cell) for a faster recharging.
Above 30°C in the monthly average the charging voltage
may be reduced (-0,004V/K per cell) to reduce
water decomposition and corrosion.
2.9 Electrolyte
The electrolyte is diluted sulphuric acid. The rated
specific density of the electrolyte in the fully charged
state is based on 20°C and the "MAX" electrolyte level
with a maximum deviation +- 0,01kg/l.
Higher temperatures reduce the density of the
electrolyte, lower temperatures increase it.
The temperature correction factor is -0,0007 kg/l per
K.
Examples:
Electrolyte density 1.23 kg/l at + 35
o
C corresponds
to 1.24 kg/l at + 20
o
C. Electrolyte density 1.247 kg/l at
+ 10
o
C corresponds to 1.24 kg/l at + 20
o
C.
3. Battery Maintenance
To avoid leakage currents and the associated risk of fire
keep the battery dry and clean. Cleaning with clear
water, no solvents, no detergents. Avoid electrostatic
charges.
If the electrolyte level has dropped to the „MIN“ mark ,
purified water as specified under DIN 43 530 Part 4
(maximum conductivity 30 µS/cm) must be used to top
up the electrolyte level to the „MAX" mark.
To be measured and listed every 6 months:
• battery voltage
• the voltage of some cells/bloc batteries (pilot cells)
• the temperature of the electrolyte in some cells/bloc
batteries (pilot cells).
Every 12 months:
• The voltages and densities/temperatures of the
electrolyte in all cells/blocks have to be measured
and listed.
• Connectors, racks and the ventilation have to be
checked.
Should the float charge voltage in single cells deviate
more than +0,10V or -0,05V from the average value (see
2.3), the customer service should be called.
A service contract with us is recommended.
4. Testing
Tests must be conducted according to DIN 43 539 Part
1 and 4 and IEC 896 - 1.
Special test instructions, e. g. to prove operational
safety in accordance with DIN VDE 0107 and DIN VDE
0108 must be observed.
5. Storage and taking out of operation
If filled lead acid accumulators are to be taken out of
operation for a longer period of time, they must be
placed fully charged in a dry, frost-free room. To avoid
damage periodical equalising chargings (every 6
weeks) or permanent float charging have to be made.
6. Transport
Cells and batteries have to be transported upright to
avoid spillage of acid. Poles have to be covered to avoid
short circuits. If so packed batteries are no dangerous
goods according to the instructions for dangerous
goods on road and on rail (GGVS and GGVE).
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