Alpha Technologies AlphaCell OPzS - Manual (Page 23)

23 OPzS-BATTERY
11.1 Battery Charging and Operation Mode
11.1.1 Charging
All charging procedures may be used with their limit values as specifi ed for:
IU characteristic
W characteristic
I characteristic
The battery can be fl oat-charged with voltage of 2.23 to 2.25 V/cell or in case of rapid
charging after discharge, with voltage of 2.35 to 2.40 V/cell.
Rapid charging usually lasts another 3-5 hours after the voltage has already reached
2.35 to 2.40 V/cell. When that occurs, an automatic switchover to the constant
maintaining (fl oat charge) voltage of 2.23 to 2.25 V/cell takes place.
Depending on the system at hand, charging may be carried out under either a
fl oating or switch operating mode.
11.1.2 Floating operation
In this type of operation, the battery and the critical load circuits are continuously
connected in parallel with a constant voltage charger. The charger must be capable
of:
Charging the battery from the discharged condition while supplying the DC power
to the connected DC load
Providing the required constant fl oat voltage
Providing voltage for equalizing the battery
Float voltage sustains the battery in a fully charged condition and makes it available
to provide the emergency power required in the event of an AC power interruption or
charger failure.
The charge voltage should be set at 2.23 V ± 1% x number of cells.
An equalizing charge should be given when:
The temperature corrected specifi c gravity has fallen more than 10 points (.010).
More than one cell falls below 2.15 V on fl oat, corrected for temperature (Refer to
Section 11.3 for equalizing charge).
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11.0 Operation
WARNING!
Before connecting battery to charger, it is important to note that several hazards are
associated with battery systems, particularly those used for large UPS applications where
terminal voltages can approach several hundred volts and currents may exceed several
thousand amperes. By exercising proper care and allowing only properly trained personnel
to work on them, batteries should serve you well and perform without incident. Observe
precautions and become familiar with local, state, federal, and professional codes and
procedures.