Webasto PosiCharge DVS 300 Operation And Maintenance Manual page 26

DVS Fast Charging System
equalization on the pack to bring it back into balance. Failure to run equalization on a
serviced battery pack prior to fast charging may result in damage to the new module. If
the problem persists or grows worse, replace the battery pack.
J) Choosing the charge algorithm is very important for the life and utility of the battery
pack. An algorithm that is not matched to the battery being charged will result in
undercharge, overcharge or excessive heating of the battery during charge. Use the
Charge Configuration menu to make sure the charge configuration is appropriate for
your battery and application. Use the BMID Configuration menu to check that the BMID
installed on the pack has the correct battery manufacturer type-code, the correct
capacity of the cells, and the correct number of cells.
K) A battery that is connected at a state of charge (SOC) which is too low to be fast
charged safely will be charged at a low rate until it has recovered sufficiently to accept
fast charging. In this case, the user must press and hold the EQ button to force
charging to begin.
L) If the battery voltage reported by the BMID goes below the minimum allowable volts per
cell or exceeds the maximum allowable volts per cell during a charge event the fault is
set. The minimum/maximum allowable volts/cell are based upon the battery type
selected in the BMID Configuration. Check the battery charge path for shorts or opens.
Check the battery for defective or damaged cells. If no problems are found replace the
BMID.
M) This fault is usually the result of an unprogrammed BMID or an improperly programmed
BMID. Using the BMID Configuration menu verify that the BMID installed on the pack
has the correct battery manufacturer type-code, the correct capacity of the cells, and the
correct number of cells input.
N) Refer to the Installation Manual for correct cable and connector sizing. Check the crimp
or solder joint between the cable and the connector pins to ensure good electrical
contact. Replace the connector if the case is damaged.
O) The equalization schedule is very important to the life of the batteries. If the batteries
are being equalized too infrequently, or the equalization is interrupted too often, the
capacity will start to degrade. If the batteries are being equalized too often, there will
be excessive water loss requiring higher maintenance. Adjust the equalization schedule
for the batteries based on the use level. See the "BMID Programming and Advanced
Features Manual" for reprogramming instructions.
P) Flooded lead acid batteries must be watered as part of a regular maintenance schedule.
Insufficient watering will result in reduced capacity, overheating and reduced life.
Consult your battery manufacturer's guidelines for a watering schedule and proper
procedures.
Q) Loose battery interconnects or power cables increase the resistance of the pack and
can cause overheating and/or slow charging. Using insulated gloves and tools, check
the torque on all bolted interconnects and power cables, and verify that welded
interconnects have not loosened.
R) Tighten all screws and fasteners as needed.
23411-W-03-01 Page 26 of 29 Webasto Charging Systems, Inc.