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Graupner Ultramat 12 Seite 14

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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.
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“.
NiMH
AUTOMATIC-
program
NiMH
balance
program
NiMH
MANUAL-
program
NiMH
discharge
program
NiCd
∆ ∆
∆ ∆
∆
delta-peak
trigger voltage
MODE MODE MODE MODE MODE
Ni-MH manual program
________________
________________
NiMH manual
C:2.5A
DECINC
+
-
Ni-MH automatic program
___________ _____
___________ _____
NiMH automatic
C:2.5A limited
DECINC
+
-
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. This is done using the
INC / DEC buttons; the range available is 0.1 A to 7 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“.
Select this program when you simply wish to recharge a
battery using the set charge current. You can adjust the
charge current using the INC / DEC buttons, but only
before you connect the pack for charging. The range
available is 0.1 A to 7 A.The charge process is terminated
automatically in accordance with the values already set
for „Ni-MH Delta Peak cut-off voltage“.
________________
________________
NiCd delta-peak-
volt =10mV/cell
DECINC
+
-
NiCd conditioning program
Ni-Cd manual program
Ni-Cd discharge program
___________ _____
___________ _____
NiCd manual
C:2.5A
DECINC
+
-
Select this program when you simply wish to recharge a
battery using the set charge current.
You can adjust the charge current using the INC / DEC
buttons, but only
before you connect the pack for
charging. The range available is 0.1 A to 7 A.
The charge process is terminated automatically in
accordance with the values already set for „Ni-Cd Delta
Peak cut-off voltage“.
The typical purpose of this program is to determine the
residual capacity of a transmitter, receiver or drive
battery, or to discharge the pack to a defined level.
In this program the charger discharges the pack using the
set discharge current (0.10 ... 100 A, left of screen) until
its voltage falls to the set final discharge voltage (0.5 ...
16.8 V, right of screen).The set final discharge voltage
should be a value of around 0.8 ... 1 V
per cell, in order to
avoid the pack becoming deep-discharged. Deep-
discharging a pack runs the risk of reversing individual
cells, i.e. they exhibit reversed polarity.
________________
________________
NiCd discharge
1.00A 4.8V
DEC
INC
+
-
DEC
+
-
ENTER
INC
Ni-Cd automatic program
___________ _____
___________ _____
NiCd automatic
C:2.5A limited
DECINC
+
-
In this program the charger detects the type of Ni-Cd
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. This is done using the
INC / DEC buttons; the range available is 0.1 A to 7 A, or
no restriction. The charge process is terminated auto-
matically in accordance with the values already set for
„Ni-Cd Delta Peak cut-off voltage“.
INC
This program is designed to optimise the capacity of a
battery, and balance the state of its component cells.At
top right you can set use the INC or DEC buttons to
determine whether the conditioning program is to start
with a charge or discharge cycle. After this you set the
number of cycles from 1 to 5 (e.g., if you set three cycles,
the pack will be charged and discharged three times). The
program discharges the battery using the set discharge
current stated on the right of the screen (0.10 .. 1.00 A),
and then recharges it using the charge current (0.1 ...
7.0 A) shown on the left of the screen. The charge
process is terminated automatically in accordance with
the values already set for „Ni-Cd Delta Peak cut-off
voltage“.The method of reading out the values for the
individual cycles is described in the section „Screen
displays“.
___________ _____
___________ _____
NiCd cycle C>D 1
C:2.5A E:1.00A
DEC
INC
+
-
DEC
INC
+
-
ENTER
DEC
DEC
INC
or
ENTER
cell voltage
charging time
… 14 …

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