D-500 MK3 User Manual Firmware V-14.2
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This charging mode is selected through the program parameter “Uncontrolled Charge Active” in engine
parameters group.
When this mode is selected, the controller will precisely decide the moment to run the genset.
The charge voltage and current are not controlled, but simply monitored. The control PID is not operative.
The maximum charge duration is limited with parameter “Max Charge Time”. Following the value of the
parameter “Stop Current percent”, the charge current may also cause engine stop before the expiration of
the Max Charge Time parameter.
Below picture describes the charge cycle steps in detail.
Step_A:
The genset is at rest.
The load consumes power from the battery bank.
The battery bank voltage decreases slowly with discharge level.
When the battery bank voltage falls below the start to charge voltage, after the charge voltage threshold
timer, the controller detects that the battery bank is discharged and decides to run the genset.
Step_B:
The engine is started, the genset output voltage increases with rpm increase.
Step_C:
After Genset Contactor Timer, the load contactor is closed. The genset starts the charging of the battery
bank. The charge current is not controlled.
It is strongly recommended to wire speed detection
through MPU, charge alternator pulses or J1939-
CANBUS and enter correct low and high rpm limit
values in order to preserve engine speed protection.
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