EnerSys Alpha FXM HP 1100, Техническое руководство

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0170022-J0 Rev A Page 64
Figure 54: Three-Stage Charging Cycle
Bulk Charging
After the bulk charging stage, the battery should be in a 70%-90% state of charge. In the Bulk
Charging , the charging current is limited to the Charge Current Limit setting.
Absorption Charging
After the absorption charging stage, the battery should be in a 95%-98% state of charge. In the Absorp -
tion Charging menu, you have the option to charge the battery at a voltage higher than the float
voltage. The higher voltage is used to speed up the absorption charging stage after a prolonged AC
power failure.
Float Charging
The float charging stage brings the batteries to 100% state of charge and maintains it there. When the
system is in the float stage it is usually at the Float Voltage .
9.2.3 Battery Temperature Compensation
Temperature Compensation (Temp Comp) is used to prolong battery life and help prevent thermal
runaway. When battery temperature compensation is enabled, the controller uses the battery tempera -
ture to calculate an offset which is applied to the battery voltage.
A typical temperature compensation curve for a 48V battery system is shown in the following figure.
Battery Voltage
Charge Current
Stage 1
Bulk Charge
Rising Voltage
High Constant Current
Stage 2
Absorption Charge
Constant Voltage
Declining Current
Stage 3
Conditioning
Constant Voltage
Low Current
Current (A)
V
oltage (V)
Time (hrs)