I am getting an arc (sound and visual indication) on the positive connector when connecting the battery to the motor.
This is an early version of the SP140 and initially I don’t recall it doing this. The last time I flew it, I could not disconnect the battery. Turns out, the positive connector was ‘welded’ together. I have replaced all connectors with those similar to the new v2.5 units, but it’s still arcing.
I’m not an electronics expert, but could there be some kind of an ‘open’ or ‘ground’ somewhere that causes this?
With the older-style batteries without the switch and the older ESC (V2 and earlier), there will be an arc when plugging in due to the capacitance. This is why the early versions use a plug connector with a built-in resistor to first charge the system slightly when plugging in.
Ah…. OK. I must have destroyed that capacitor at some point. If I were to install an in-line capacitor now, what would you suggest its criteria/parameters be? Arching can’t be good on the more sensitive components ‘downstream’.
If you don’t have a big power need for level flight like 6+kw than I would go back to the OS8 connectors which I like a lot and they are rated at 110A continous and 300A peak. Although 6-7kw is like 70-80A which it could easely handle by the ratings. The built in 5.3ohm resistor does a good job too.
You can check the resistor with a multimeter, in any antispark connector.
