Benton BX2 - 7 step battery charger

7 Steps

1. Diagnosis & Recovery

As soon as charging instruction is given to the charger, the unique function automatically checks status of battery (detects voltage). If a deeply discharged battery's voltage is over 4.5V +-0.5V (for 12V battery) or 16V +-0.25V (for 24V battery), charger begins pulse charging with 3A high current and 1.5A low current to recover it, which terminates when voltage reaches to 10.5V +- 0.25V for (12V battery) or 21V +-0.25V (for 24V battery) at the beginning of the process, the charger skips pulse charging and it switches over to pre-selected charging mode.

2. Bulk

80% of energy is returned in this phase of charging. Here charger performs in multi-stages:

For 24V battery
a) High Rate Charging: Charger delivers constant current of 3.5A until the voltage reaches to 25.6V
b) Medium Rate Charging: Charger delivers constant current of 3.0A until the voltage reaches to 28.2V at which point the charger switches to Absorption phase

For 12V battery
a) High Rate Charging: Charger delivers constant current of 7.0A until the voltage reaches to 12.8V
b) Medium Rate Charging: Charger delivers constant current of 5.0A until the voltage reaches to 13.9V, at this level constant current is 3.5A until voltage reaches to 14.0V. Finally charger delivers 3.0A current until voltage reaches to 14.1V at which point the charger switches to Absorption phase. Since current is not delivered at highest constant level, BENTON BX2 charger will minimise the heating up of the battery, and hence will elimanate the build up of gases. This ensures more efficient and safer performances.

3. Absorption

Use of a constant high current for extended periods of time risks gassing the battery. Therefore a constant low charging current is given at 1.0A to raise voltage from 28.2V to 28.8V (for 24V battery) and 14.1V to 14.4V (for 12V battery). In this phase complete charging up to almost 100% is achieved. Charger switches to trickle charge phase after sensing that the battery is truly fully charged.

4. Trickle Charge

Battery is fully charged and ready to use. The battery will signal to the charger and will only take enough current to sustain small loads such as alarms etc or current leaks in the vehicle wiring circuit. Very low current of 200mA is given to the battery. When voltage drops below 25.6V (for 24V battery) or 12.8V (for 12V battery), monitoring circuit senses that battery needs more current to maintain its charge than available in trickle charge phase. The charger switches to Maintenance charge phase.

5. Maintenance Charge

As charger continuously monitors the terminal voltage in order to determine if a maintenance charging should be intitiated, if the battery is loaded and/or terminal voltage falls below 25.6V (for 24V battery) or 12.8V (for 12V battery), the charger starts maintenance charging pulse at constant 1.0A until voltage reaches to 28.8V (for 24V battery) or 14.4V (for 12V battery). Now maintenance charging is discontinued. Cycle of trickle charging and maintenance charging is repeated indefinitely to keep battery in good condition when it is not in use and enables charger to be left connected indefinitely.

6. Supply 13.6V

BENTON BX2 charger provides a constant charge at 13.6V and current up to 5A. This is suitable for maintenance of 12V battery using Float charge approach at 100% of charge. BENTON BX2 battery charger is also used as a power supply with maximum capacity of 13.6V/5A. In this mode spark free function is inactivated. However reverse polarity protection function still works. It has electronic overload protection, which activates if output voltage from the charger falls below 4.5V and current to around 6A (max).

7. Boost 16V

To recover severly discharged 12V batteries this mode is useful. High voltage (17V max) at 1.5A is applied to a maximum period of 3 hours. At finish of this stage it would switch to normal charging setting (14.4V).

November 2011
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