System Description - Webasto PosiCharge DVS 300 Operation And Maintenance Manual

DVS Fast Charging System

3 System Description

The DVS 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 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 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").
23411-W-03-01 Page 9 of 29 Webasto Charging Systems, Inc.