975-0696-01-01
65
Battery Charging Reference
Bulk Stage
Bulk charge is the first stage in the charging process and provides
the batteries with a controlled, constant current. Once the battery
voltage rises to the absorption voltage threshold, the charger
switches to the absorption stage.
Absorption Stage
Absorption charge is the second stage of battery charging and
provides the batteries with a controlled, constant voltage. During
this stage, the current drawn by the batteries slowly decreases.
When this current falls below 2% of the battery capacity, or when
the configurable
Absorb Time
expires, the charger switches to the
Float or NoFloat stage, depending on the selected charge cycle. The
timer begins when the battery voltage is above the bulk termination
voltage for three minutes.
NOTE:
When the charge cycle is interrupted, the charger will restart charging at
the beginning of the multi-stage algorithm.
Exit Current Threshold can be effectively disabled by programming the
amp-hour capacity to the minimum. In this case, absorption will only exit
once the Max Absorption timer expires.
Charge current during equalize state (optional state not shown here) is
normally limited to 10% of the programmed amp-hour capacity setting. If
this setting is programmed to the maximum, the charge current during
equalize is instead limited to whatever is programmed for the maximum
current limit of the unit.
Synchronized charge states are active when more than one charging
device is connected in the system via the Xanbus network.
• The first unit (Freedom SW 230V) to enter bulk, causes all other
chargers to enter bulk.
• The first Freedom SW 230V to enter absorption causes all other
Freedom SW 230Vs to enter absorption.
• The last Freedom SW 230V ready to exit absorption triggers all
Freedom SW 230Vs to exit absorption and exit charge.
Table 18
Preset Bulk Voltage Settings
Battery Type
Termination
Voltage
Preset Bulk
Voltage
Flooded
28.4
28.8
Gel
28.0
28.4
AGM
28.2
28.6
Custom
28.8 (changeable)
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