User manual

8.5.9 IUIA charge mode (MPPT 6000-M only)
CAUTION!
IUIA charging performs targeted overcharging of the battery. This can result in voltages of up
to 2.6 V/cell. All loads connected to the battery must be able to tolerate these higher voltages,
even when these are only in Standby mode.
NOTICE!
– The IUIA charge mode is only available for lead-acid and lead-gel/AGM battery types.
–
The IUIA charge mode can be activated for these battery types in the menu. The IUIA
charge mode is executed repeatedly according to a configurable 1-6 monthly cycle.
– The first execution of the IUIA charge mode after it has been activated only occurs after
completion of the first boost charging subsequent to the time of activation. The repetition
cycle is based on the month of first execution. The repetition cycle is not accurate to the
day. The IUIA charging mode is executed after completion of the first boost charging
during the active month for the repetition cycle.
– Execution of equalisation charging never activates the IUIA charge mode. Repeat execution
of a boost charge during the repetition cycle does not cause premature execution of IUIA
charging.
– An active IUIA charge mode is cancelled when the device is switched off, state Off.
– The following conditions must be satisfied in order to execute the IUIA charge mode:
– The nominal capacity of the battery must be set. The nominal capacity is usually
specified on the battery type plate. The battery capacity specification is used for
determining the I50 charge current. I50 = Ah/50h.
– The battery used must have a minimum capacity of 50 Ah.
– Energy loads connected to the battery must be regulated so that the battery charge
current can drop to I50. Loads must be disconnected if necessary.
– The MPPT 6000-M regulates its power unit charge current to I50. Regulation of external
currents, that can be e.g monitored with PA HS400 current sensors is not performed.
– In the IUIA charge mode, the capacity counting is performed according to the selections
made in ‘Main menu è Battery settings è Battery control mode è Sensor member list’.
– The IUIA consists of three phases:
– I phase: The I phase corresponds to charging the battery using the boost charging
settings. After the period configured for boost charging expires the state changes to
the U phase.
– U phase: In the U phase charging continues with a voltage of 2.4 V/cell until the
charge current is less than I50 of the battery for at least 50 s. The IUIA charging stops
if more than 40 % of the specified battery capacity is charged in the period until the
charge current drops to I50. The device then switches to the Float charging mode. If a
voltage of 2.4 V/cell cannot be maintained during the U phase due to insufficient
charging power then the device remains in the U phase but the capacity counter is
stopped. The capacity counter is started again when the charging power is sufficient
for maintaining a voltage of 2.4 V/cell.
– IA phase: The charge current is limited to I50 during the IA phase. An active IA phase
is indicated by the letter I in the footer of the status display, see
Ä Chapter 7.3 ‘Status
display’ on page 53 . When the battery voltage reaches the range of 2.53 V/cell to
2.55 V/cell the amount of charged energy is now measured using a capacity counter.
The IA phase ends when the battery is charged to 20 % of the specified nominal
battery capacity. This ends the entire IUIA charging cycle and the MPPT 6000-M
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