DKG-379 User Manual Rev_02
V-15
(24-12-2012)
K43D01-EN - 39 -
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.
The controller adjusts the rpm in order to match exactly the battery bank voltage.
When voltage matching is reached, the load contactor is closed. Thus load switching is performed with zero
current. This provides longer contactor life.
Step_C:
The controller increases the rpm slowly until reaching the
maximum charging current
.
Step_D:
The rpm is controlled in order to keep the charging current constant at its maximum set value.
The battery bank voltage increases slowly until reaching the
nominal charge voltage
.
Step_E:
The rpm is controlled in order to keep the battery bank voltage at the
nominal charging voltage
.
The charge current decreases slowly.
Step_F:
When the charge current falls below the
boost start current
, the controller starts the optional boost charge
cycle.
Step_G:
The
maximum charging current
is maintained until the battery voltage reaches the
nominal boost
voltage
.
The controller increases the rpm slowly until reaching the
maximum charging current
.
11.2. OPTIMAL CHARGE CYCLE DESCRIPTION
