Service manual

DCB, DCFCB and DCFCTB Models
43
Theory of Operation
Figure 7 Rotator Motor Current Sensor Board Schematic 2005221B
Battery Charger Theory of Operation
Overview
The charger features a switch mode voltage and current regulator to improve
efficiency and reduce heat. It switches on each 60 Hz AC cycle, one at a time, as
needed, to control voltage and current. The charger incorporates a three-stage
charge algorithm to charge the battery without gassing and to maintain the
batteries at the optimum charge level. The charger delivers a constant 2 Amp
trickle charge until the battery’s voltage reaches 10 Volts. The charger then limits
the charge current to 4 Amps, the bulk charge, until the battery’s voltage reaches
the float voltage of 13.5 Volts. The charger also incorporates a temperature sensor
that limits the charge current to 2 Amps if the ambient temp of the charger
reaches 105°C.