GRAUPNER ULTRAMAT 15 Instructions D'utilisation page 29

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
P b m a n u a l
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C : 2 . 5 A
+ -
INC DEC
If the battery manufacturer states a low maximum charge current, then it is important to limit the
charge current to that value to avoid the charger setting a higher current if the battery appears
to be willing to accept charge.
The battery can then be connected to the charger and the charge process started: the unit
starts charging at 0.00 A and slowly raises the current until it reaches the set limit.
The charger constantly assesses the state of the battery during the charge process, and
adjusts the charge current to suit its condition.
The charge program automatically determines the number of cells (cell count) in the battery by
measuring its overall voltage.
Please do not be surprised if the charger does not deliver the charge current you have selected.
The charge program constantly monitors the battery's voltage, and limits the current in order to
prevent excessive gassing of the battery.
The ULTRAMAT 12 now charges the battery using the maximum possible current until its
voltage rises to around 2.3 to 2.35 Volts per cell. The charger then switches to a lower current to
bring the battery gently up to full charge; this process reliably fills the battery „to the brim".
The unit cuts off the charge process automatically when the battery reaches a voltage of
around 2.45 to 2.5 Volts per cell.
The effect of the automatic charge current adjustment system is to complete a full charge safely
in much less than the usual 14 to 16 hours.
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E N D C H G 3 6 7 : 0 9
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P b 0 m A
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
P b d i s c h a r g e
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1 . 0 0 A
+
-
INC
DEC
ENTER
Pb manual program
In this program you can set the maximum permissible
charge current using the INC / DEC buttons, but only
before you connect the lead-acid battery for charging.
This setting only determines the top limit which the
charger is permitted to feed to the battery.
When the charge process is terminated, the charger
0 4 4 4 8
emits audible tones for a certain period. At the same time
2 . 1 4 7 V
the screen also displays the message „END".
Pb discharge program
The typical purpose of this program is to determine the
residual capacity of a drive battery.
In this program the charger discharges the pack using the
1 2 . 0 V
set discharge current (0.10 ... 5.00 A, left of screen) until
+
-
its voltage falls to the set final discharge voltage (1.7 ...
INC DEC
12.0 V, right of screen). To obtain a realistic capacity
reading, i.e. one which actually reflects the battery's
condition, the discharge current should be set
substantially below 1C (capacity of the battery = 2 Ah —>
C = 2 A), and the final discharge voltage should be set to
around 1.7 V per cell.
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