DVS 400 Fast Charging System Operation and Maintenance Manual
09190-W-03-01
Page 10 of 27
Webasto Charging Systems, Inc.
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System Description
The DVS 400 Fast Charging System is a transistor-based fast charging system that provides all of the battery
charging and equalizing required for your application. It provides a constant current-constant voltage-constant
current (IEI) charge profile that precisely controls the charge rate, and optimally charges your batteries by precisely
adjusting the current in response to the batteries’ capacity, temperature and age.
The keypad and display on the front of the DVS 400 provide the user interface to the charger. The alphanumeric
display panel constantly updates the charger and battery status, and allows access into the programming menus
through the keypad. Four status LEDs allow the user to determine from a distance when the charge is in progress,
at 80% complete, fully charged, or in equalization. A fault/warning LED serves to alert the user to fault conditions.
The DVS 400 works with a small monitoring device mounted on the battery called the battery monitor/identifier
(BMID). The BMID enables the charger to automatically adjust the charge to match the requirements of all of the
batteries in your fleet, without needing to worry about mismatching batteries and chargers.
Each BMID is pre-configured with the following information:
1. An identification number, which can help track the charging history of a specific battery.
2. A type code, indicating the manufacturer and type of battery.
3. The number of cells in the battery.
4. The ampere-hour capacity of the battery.
5. The start current limit of the battery pack for optimal charging.
6. The State of Charge (SOC) limit of the battery. This will determine the SOC at which the charging will stop.
7. Internal resistance.
8. Maximum ampere-hours between equalizations.
9. Maximum days between equalizations.
10. Equalization day of the week.
11. Voltage limit for Fast Charging and Equalization.
12. Battery temperature foldback.
13. Initialize BMID.
Typically, the battery dealer or another authorized service technician will install the BMID on the battery and
configure it before delivery to the customer. BMIDs may also be reconfigured on site through the charger front panel
(see the “BMID Programming and Advanced Features Manual”).
