Doctorbass wrote:CamLight wrote:Another failure mechanism to deal with when considering pinouts....
I think we also have to consider potential long-term problems. As connectors are used, dirt and other contaminants often build up inside. Keeping the voltage between any two adjacent pins as low as possible helps prevent a short in case of water or conductive dust (either slightly or very conductive) entering or building up near/on the pins. Or any other unforeseen problem.
About the porential failure would the silicon grease wouldreduce the risk ?.. i mean it is already used in many comercial EV for the low current connections ?.. I kow that the commercial connector also have sme sophisticated rubber seal but for a 37 pind iy might be $$$
At wich level should we consider the potential failure?.. i mean..all low current the connector on the controller are a as sensitive as all other but it still work for our kind of needs ?
My understanding about those greases is that they're only on the parts of the connector pins not actually touching the mating contact. That is, the grease is rubbed off where the two contacts, plug and receptacle, rub against each other when mating. I'm not sure that using a grease would help for us except for water intrusion? Grease is also a great dust magnet. Somebody with more knowledge about these greases and their use will hopefully chime in.
I like your choice of DB37. I don't think a different connector would be better. Projects here are budget-driven and DB37's are dirt cheap compared to other connector types. And electrical tape around the place where the connectors are mated goes along way.
The application for this connector are all low current...until two pins short together.
And while a sealed connector might prevent contamination and water intrusion, it still wouldn't address all the potential problems in having over 100V between two adjacent pins. Not sure how we should consider any potential trouble. I guess each person will make their own decision based on cost, time, and risk. But IMHO, any change that costs nothing but could even potentially prevent a problem should be made. Personally, I can't remember how many times my DMM probe tip has slipped off one pin and bridged two together.