SOFTWARE MANUAL C32
22.2.2 CHARGING LIMITATION BY TIMER
When the charge rate is very low the required end of charging can not be securely accomplished by recognizing the cell
voltage falldown (Minus Delta L). Some modern NiMH batteries allow a timer controlled charging with charge currents of
up to 1/3 C. Therefore in case of a battery with 1200mAh a charge time limitation of about 3 - 4 hours is reasonable. The
parameter 15
determines the battery voltage that has to be accomplished before the preset charging time starts and
which will limit the charging in case other charging end criteria will not work. So you have a security perimeter that should
be very tight.
Attention: The timer controlled charging limitation is a secondary battery protection, because the battery charge condition is
unknown at the beginning of charging and charging end criteria might not be recognized by the software.
22.2.3 MINUS DELTA U IDENTIFICATION
(Voltage inversion at end of charge)
When a NiMH battery is full (end of charge), the battery voltage drops though it is further furnished with charge current.
This voltage drop is interpreted as end of charge. To be able to identify this properly, the charge current must not drop
below 300 mA. A 12 bit A/D converter integrated in the μ-processor measures the charging voltage. Several
measurements are averaged and added to a 16 bit value in order to eliminate deviations in individual measurements. The
measuring interval per measurement is two seconds. With the number of thus gained values configured in
parameter P3
,
the time delta t is determined, which is used to dedicate the voltage drop..
22.2.4 MAXIMUM BATTERY VOLTAGE
This criterion is found out by measuring the cell voltage and shall protect the battery. The value specified for the battery
must be entered here.
22.2.5 DELTA T / DELTA t IDENTIFICATION
(Change in temperature)
If the battery temperature T rises in time t faster than the parameter indicates (charging energy is turned to heat only) the
battery is estimated full. This works only when a preset battery voltage is exceeded.
22.2.6 MAXIMUM T IDENTIFICATION
(Maximum battery temperature)
This criterion is meant to protect the battery and should be set to the value specified by the battery.
With the charging voltage applied the charging is restarted with each reset. Moreover the charging restarts when the voltage
falls below a defineable minimum battery voltage (typical for 1.2V / cell of the standard battery pack).
22.2.7 RESTART CHARGING WITH CONNECTED CHARGING DEVICE
The printer may work while the charging device is connected. Printing operation does not interfere with complete
charging.
If the battery voltage falls under a minimum value that can be entered with a battery charge command, charging restarts.
GeBE Elektronik und
phone
+49.89.894141-0
GeBE-document-no. SoMAN-C32-E-V2.2-0793
Feinwerktechnik GmbH
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date
July 7, 2020
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