Lead-Acid (Pb) Charge Programs - GRAUPNER ULTRAMAT 18 Operating Manual

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* * * L i P o c e l l s * * *
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2 c e l l s (
+
-
INC
DEC
! Caution ! Please take great
care to set the correct cell
count and battery type. If you
make a mistake, the battery
could explode and burst into
flames !
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L i t h i u m t y p e
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L i P o 4 . 2 0 V / C
+
-
INC DEC
(LiPo, LiIo or LiFe) affects the charge termination voltage. If you find that a Lithium battery has
unexpectedly been charged only to the 2/3 full mark, you have probably set the incorrect battery
type at this point.Caution: if you set an incorrect value at this point, the battery may be damaged
irreparably, and could even explode!
The final charge voltage can be adjusted in 0.01V steps.
The max. charge voltage for LiPo is 4.2V, for LiIo 4.1V, for LiFe 3.6V. To store the batteries, adjust
the charge voltage about 0.4V lower as the maximum charge voltage.
At charging/discharging the battery types will be displayed as followed:
LiPo (LiMn) = LP
LiIo = LI
LiFe = LF
This program is designed for charging and discharging lead / sulphuric acid and lead / gel
batteries with nominal voltages of exactly 2, 4, 6, 12 and 24 V (1, 2, 3, 6 and 12 cells).
Caution: the charger will not recognize lead-acid batteries with other nominal voltages, and
such batteries must not be connected to it.
Lead-acid batteries behave entirely differently to Ni-Cd and Ni-MH batteries. Lead-acid batteries
can only deliver relatively low currents relative to their capacity, and similar restrictions very
definitely apply to charging. Manufacturers usually state 14 to 16 hours for achieving nominal
capacity when recharging at the normal charge current. The „normal" charge current is defined
as one tenth of the battery's nominal capacity. Example: battery capacity = 12 Ah —> normal
charge current = 1.2 A. In contrast to Ni-Cd and Ni-MH batteries, lead-acid chargers generally
monitor the battery's voltage in order to determine when it is fully charged.
38
Lithium cell count
When you have connected the battery to the charger, hold
the START button pressed in for about two seconds and
the screen will display the cell count of the Lithium pack. If
7 . 7 3 V )
the pack contains 1 or 2 cells, the charger detects and
sets the number of cells fully automatically. If the pack
contains more than two cells, you may have to adjust the
cell count manually using the INC / DEC buttons, as the
automatic circuit is unable to detect more than three cells
reliably. On the right-hand side you will see the voltage of
the pack connected to the charger. Pressing the START
button again initiates the charge process. Only cell
number should flash. If cell number and battery voltage
are correct, press the Enter button to start.
Lithium type select program
This is actually the most important set-up program for
Lithium batteries. In the Select program you enter the
battery type and battery capacity. It is vital to enter this
information with the greatest care. Check it very thoroughly,
as the charger derives all the other charge parameters from
the settings you enter here.The battery type you select
14. Pb (lead-acid) programs
Pb
MANUAL-
program
Pb
MODE MODE
discharge
program