Hello,
I found the answer myself. Let me share it with you.
On page 16 of the assembly manual for the K6200:
velleman.be/downloads/0/illu … _k6200.pdf
you can find the requested table that translates pin assignments into time periods for the CD4536 timer.
With this information we can go back to the K7300 charger. By playing around with the 16 combinations of coding pins #9, #10, #11 and #12 you can set the most convenient charging time for you application.
In my case, I found the default 52min or 14h either too short or too long charging times. What I did was setting pin #9 to LOW while keeping #11 to HIGH, which enables setting a charging time of 7h. Obviously, in order to achieve full charge, charging current has to be set accordingly, as follows:
I = Q / (t / f) = Q x f / t
I: Charging current, in mA.
Q: Battery capacity, in mAh.
t: Charging time, in hours.
f: Inefficiency factor, in the 1.1-1.4 range.
Examples:
- Charging 2 AA NiMH batteries of 2100mAh, 14h setting.
Voltage set to 2.4V
Pin assigments #9=H, #10=L, #11=H & #12=H.
Inefficiency factor: 1.4.
Charging current: I=2100x1.4/14=210mA, we select 200mA.
- Charging 7.2V NiMH battery pack of 3300mAh, 7h setting.
Voltage set to 7.2V
Pin assignments: #9=L, #10=L, #11=H & #12=H.
Inefficiency factor: 1.2 (it decreases as charging time is lower).
Charging current: I=3300x1.2/7=565mA, we select 550mA.
I hope I made it clear enough. Feel free to contact me for further advise.
Regards,