GRAUPNER ULTRA TRIO PLUS 16 Operating Manual page 40

N i M h b a l a n c e
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2 sec.
N i M h B l C = 1 . 2 0 V / C
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2 sec.
START
* * I N F O R M A T I O N * * *
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B A L A N C E R C O N .
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2 sec.
E N D 2 8 : 3 0
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NiMh-Delta-Peak (- Peak ) trigger voltage
N i M h d e l t a - p e a k -
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2 sec.
N i M h d V =
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+
INC
40
NiMh discharge balancing program
c u t
The discharge balancing program does discharge and balance
up to 8 cells of a battery pack.
The fi nal discharge voltage for the balancer can be set within
the range 1.20 ... 1.30 V using the INC or DEC button.
The individual cells in a battery should be balanced before
the pack is charged, to avoid the possibility of individual cells
being overcharged during the charge process. A battery should
always be balanced before being charged if it has been stored
for a considerable period;
connect the balancer plug to the charger to carry this out.
+ -
It is also essential that the voltage of each cell in the pack should
INC
DEC
be higher than the set balancer fi nal discharge voltage.
If you wish to obtain maximum battery capacity, the individual
cells should be discharged to 1.20 V a few hours - but no longer
than two hours - before the next charge process. If the voltage
falls below 1.20 V, the battery cells lose capacity, so the pack
must be charged to around 60% capacity before being stored
for a protracted period.
The program discharges the battery pack at a rate of 0.1A ...
5.0 A. Cells with a higher cell voltage are discharged at an
additional current of around 100 mA (balancing current). The
charger terminates the discharge balance process once all
the cells have reached the balancer fi nal discharge voltage
0 1 4 2 5 (+0.01 V).
It is possible to adjust the trigger voltage (in mV per cell!) of the
automatic termination circuit for Ni-MH batteries. However, Ni-MH
batteries have a less pronounced voltage drop than Ni-Cd cells,
and a practical range has proved to be 5 ... 25 mV / cell. If the
trigger voltage is set higher, there is a danger of overcharging the
battery; if set lower, there is a danger of premature termination.
We recommend that you carry out a series of test charges to
5 m V / C
establish the ideal trigger value for your batteries. Start with
5mV / cell.
-
DEC