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TLG 1000 C4
GB
Operating status displays
The various displays have the following meanings:
The LED fl ashes red and green once per second and the bars on the battery
symbol alter
nately move from the bottom to the top and vice versa: The bat-
teries are being alternately charged and discharged. (Refresh-Function: older
or long stored batteries are being refreshed.)
The LED fl ashes green once per second and the bars in the battery symbol
ar
e moving from the bottom to the top: A deeply discharged battery is being
gently recharged with a reduced current.
The LED glows constantly red and the bars in the battery symbol are moving
fr
om the bottom to the top: The batteries are being charged with the maximum
charge current.
The LED glows constantly green and all bars in the battery symbol glow
continuously
: The batteries are fully charged and the battery charger has
switched to trickle charge.
Calculating the average charging time
Depending on the type, age and remaining charge in the batteries, the charging
process can take various lengths of time. The average charge time can be cal-
culated using the following formula. Take note however that the times given are
only guiding values.
Charging Time (min) = Battery capacity (mAh) x 1.4 x 60
Charging current of the device (mA)
Automatic charging control / Retention charging
This battery charger controls the charging time for batteries of the types Ni-Cd
and Ni-MH separately. This control is based on the –Δ U ("minus Delta U")
calculation. In mathematics, with Delta Δ diff erences are indicated. In this case,
"Minus Delta U" means a negative voltage diff erence.
This charge identifi cation makes itself useful in the following eff ects: Should a
battery be charged with a constant current, its voltage rises continuously. When
a battery is full, its voltage reaches a maximum but falls again slightly with further
current fl ow. This light fall in voltage is recognised by the charging electronics
and the charge process is terminated. The battery charger automatically switches
to "Retention charging". This means that the batteries are no longer being loaded
with constant current, instead, with short current pulses. This counteracts the self-
discharge and the batteries are kept in a state of full charge.
Timer control
In addition, this battery charger has a timer control which automatically switches
over to retention charging after 17 hours. This serves as an additional protection
against overcharging should the charge termination not respond due to a possibly
defective battery.
Buch_74183_LB1.indb 31Buch_74183_LB1.indb 31 27.06.12 16:3127.06.12 16:31
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