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Graupner Ultramat 18 - 6470 Manual

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33
NiCd-Delta-Peak (-
∆∆
∆∆
∆ Peak)
trigger voltage
This process analyses the voltage peak of the charge curve, which indicates with great
accuracy when the maximum charge capacity is reached.When the charge process is started
the battery voltage initially rises continuously, but as the pack approaches full capacity it begins
to heat up. This in turn causes the battery voltage to fall slightly (Delta-V). The charger detects
and assesses the voltage decline.It is possible to adjust the sensitivity, or trigger voltage (in mV
per cell!) of the automatic cut-off circuit for Ni-Cd batteries. A practical range of values has
proved to be 10 … 30 mV / cell. Higher voltages often lead to overcharging of the battery,
whereas a lower voltage tends to result in premature termination of the charge process. We
recommend that you check the information supplied by your battery manufacturer, then carry
out a series of test charges to establish the optimum value for your battery. Start with 10mV/cell
to avaid overcharging the battery.
The automatic charge termination
circuit (battery full detection) works on
the proven Delta Peak principle (also
known as the Delta-V process), which
is already in use in millions of chargers.
12. NIMH-programs
A set of convenient charge programs for recharging Nickel-Metal-Hydride batteries, as
commonly used for modelling purposes. When the charge / discharge program is finished, the
screen displays the name of the charge program alternating with the message „END“, together
with the charge time, the last (dis-) charge current, the charged-in (discharged) capacity and
the battery voltage, and continues to do so until you disconnect the battery. This information can
often give you a useful indication about the Ni-MH pack’s charge characteristics and capacity, or
warn you if the charger has incorrectly assessed the pack as being „full“.
Ni-MH automatic program
________________
________________ NiMH automatic
C:2.5A limited
DEC
INC
+
-
In this program the charger detects the type of Ni-MH
battery connected to it, and adjusts the charge current
accordingly to avoid overcharging the pack.
The maximum charge current can be set before you
connect the battery to be charged.
Never use a maximum charge current higher as the value
described in the battery instruction, never higher as 2C!
Never charge transmitter batteries with more as 2A!
f. e. a 4.2Ah battery should be limited to max. 4.2A.
This is done using the INC / DEC buttons; the range
available is 0.1 A to 20.0 A, or no restriction.
The charge process is terminated auto-matically in
accordance with the values already set for „Ni-MH Delta
Peak cut-off voltage“.
________________
________________NiCd delta-peak-
volt =10mV/cell
DECINC
+
-
cell voltage
charging time
NiMH
AUTOMATIC-
program
NiMH
cycle
program
NiMH
MANUAL-
program
NiMH
discharge
program
NiMH
∆ ∆
∆ ∆
∆
delta-peak
trigger voltage
MODE MODE MODE MODE MODE
MODE
(2 sek.)
MODE
NiMH
discharge balancing
program
… 33 …


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