Tronic TLG 500 B1 - Manual (Page 46)

43 TLG 500 B1
GB
Operating status displays
The various displays have the following meanings:
■ The LED blinks red and green in 1 second intervals (not for 9 V): The batteries
are being alternately charged and discharged (Refresh-Function: older or long
stored batteries are being refreshed).
■ The LED blinks red and green in 1/2 second intervals (not for 9 V): The
batteries are being discharged to reduce the memory eff ect.
■ The LED glows red constantly: The batteries are being charged with the
maximum charge current.
■ The LED glows green constantly: 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 15 hours. This serves as an additional protection
against overcharging should the charge termination not respond due to a possibly
defective battery.
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