Waeco PerfectCharge IU152A Installation And Operating Manual page 25

Using the IU0U automatic charger
I Phase
The empty battery is charged with a constant current at the beginning of the
charging process, until the battery voltage reaches 13.8 V or 27.6 V. The
charging current falls slowly when the battery has reached this charging lev-
el. If the current falls below the 80% mark, the charger switches to the higher
charging voltage of 14.4 V/14.8 V or 28.8 V/29.6 V.
Note
I
The charging voltage and the time for the main charging phase
(U0 phase) can be selected by means of a switch panel (see chap-
ter "Setting the IU0U automatic charger (fig. 8, page 7)" on
page 46).
U0 Phase
Now the time that limits the main charging phase (U0 phase) to a maximum
of 8/16 hours is recorded. When the charging voltage is switched over, the
current is increased until the maximum is reached. It remains constant as
long as the battery voltage is below 14.4 V/14.8 V or 28.8 V or 29.6 V.
When the maximum voltage is established, the current drops again. The volt-
age remains constant (U0). During this main charging phase, which is limited
to 8/16 hours, the battery is charge completely.
U Phase
If the current falls to 10% of the rated current or if the time limit of 8/16 hours
is exceeded, the charger switches to trickle charge (13.8 V or 27.6 V)
(U phase).
Note
I
The chargers with two or three charging connections enable batter-
ies to be charged separately. The outputs are separated internally
via diodes. The charge level of the weaker battery is always
brought to the level of the stronger battery first. The charging char-
acteristics are as described above.
Caution
e
The maximum battery capacity (see chapter "Technical data" on
page 52) must not be exceeded since that would affect the individ-
ual charging phases.
48
PerfectCharge