12 (30)
Document no.
99-99-111
Version
6
Date
2003-10-16
Sign.
ToNo
3.7.2 Charging algorithm
In this group, the parameters are programmed which produce a correct charge curve.
The MTM charging program contains a number of charge curves which can be selected
using the keyboard. The active curve is displayed in the menu header.
Battery capacity, no. of cells.
It is important to specify the battery capacity so that all the current values in the
charge curve are adjusted to suit the battery. All currents are specified as a percentage
of I5 (the battery’s 5-hour current, i.e. Ah/5) or I1 (the battery capacity) depending on
the programming of control registers (see below).
The value in “no. of cells” is used to calculate all charge voltages in the charge curve.
These charge voltages are specified in V/cell.
The following parameters are set automatically when you select a charge curve under
“Service” (see 3.7.7). These parameters are set at delivery and should only be edited in
consultation with the supplier of the battery or charger.
N.B.: not all parameters are used in all charge curves.
Charging factor normal, charging factor acid circ..
How much energy has been discharged from the battery is calculated during
charging. This value is multiplied by the charging factor, and when 100% of the
energy discharged has been recharged, additional charging starts which goes on until
the calculated number of Ah have been recharged. The user has the option of
programming the charging factor for batteries both with and without acid circulation.
With the guidance of the pump pressure entered, the program selects a charging
factor in accordance with the values programmed into “charging factor normal” or
“charging factor acid circ.”. This results in correct charging even if there is a fault in
acid circulation.
Current I0, current I1, etc.
Indicates charge currents as a percentage of I5 or I1 for the various charge curve
elements.
Voltage U0, voltage U1, etc.
Indicates the charge voltage in V/cell for the various charge curve elements.
Max I0 time, max I1 time, min I1U1 time, etc.
Max times exceeded result in safety shutoffs (apart from I0 time). This is designed to
protect the battery in the event of a fault. The max times for I0, I1 and I1U1 are
calculated automatically, taking into account battery and charger size if the value 0 is
programmed. This automatic function is indicated by ··:··.
Min times mean that the charging program will not continue until this amount of time
has passed. E.g. min I1U1 time and min I2 time.
Baseload
If the battery is under load during charging, this current should be compensated for.
Measure and program the load current. All currents are compensated with this value.
Control register 1 and 2.
With different values in the “control register” parameter, it is possible to switch on
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