Samson said:
I thought I understood how a Cell Log 8M connected to a battery pack (40 Volts) from reading the rather vague PDF manual but while connecting one using pins 1 and 9 I heard a spark and the cell log would not power up. The polarity was + on pin 9. The manual for the CD appears to show the full pack voltage connected between pins 1 and 9 so I do not know what caused this. The unit will power up with the USB power connected but when I opened it up it looks like a component near the pins has blown open. I have another unit but I am reluctant to try it until I understand the cause of the problem. Perhaps I misunderstand how it connects. The Cell log was new. Any ideas?
As stated by Alan B the max amount of cell you can connect are 8. IT sounds like you did things correct but just to be sure I go thouth how I always connected mine. I connect to 8 cells....the CellLog8 has 9 connectors numbered "0" through "7" and a "+" mark. I wire all my cells together then attach the wire from the "0" to the negitive of my first cell (this would be considered the negitive you would use to connect to your controller...or the neg you would use to messure the total pack voltage). Then connectt the #1 to the next cell's negitive and so on. the last connection should be the "+" wire from the CellLog8 and it is connected to the positive terminal of the last cell. This is where you would connect if you were checking the total voltage of the pack.
Note: If by chance the CellLog8 was active when you started connecting it will power-up when you connect the 3rd. wire (#0, #1 and #2). It will read the voltage of the first 2 or 3 cells. Most people that have a problem connecting the CellLog8 find that they connected it 180 degrees backward. I've worked with people on the phone on a few occasion helping them connect their CellLogs just to find they started with the wrong cell. Just remember the "0" and "+" go on the terminals that are used to messure the total pack voltage.
Bob