LROBBINS wrote:My chair have one box on the left side that has a on/off switch. When i try to climg on to hard curbs and it is in a bigger effort it just shuts down.
Thats when some good samaritan have to reach the on/off button and turn the power on again.
Then the joystick can be turned on and is like reseted to minimum speed. I have put it fast and furious again. Not that fast and neither furious but thats what we have...
What is that box cut off thing by the way?
Hard to know for sure without seeing it, but from the description this sounds like a circuit breaker that is cutting off all power when it senses that too much current is being drawn. It could be undersized, or it could be old and tired - especially if it's been tripped many times. If it is a circuit breaker, somewhere on it it will say how many amps it should continuously carry. It will trip after a significant delay at twice that current, and much faster the more the current exceeds its rating. If it has gotten weak, it may trip at a much lower than rated current.
If you suspect that it is tripping too easily, it is probably easier to just replace it rather than try to test it - for that you'd need a peak-hold ammeter to see what current was actually flowing just when it trips. If it is a standard type, you should be able to find a replacement at an electronics supply for a price much better than what a wheelchair dealer would charge. Even if you can't find it there, you may be able to find it online from a wheelchair parts supplier (such as Monster Scooter); they are not the cheapest source, but still better than the dealers.
Ciao,
Lenny
I dont know if its a circuit breaker or not. But from my expirence it those what i said.
Seams that mine is connected to the power module from what i can see, the pic i show below, the cable goes on its direction...
I dont even know what a circuit breaker does, but from what it sounds, looks like it works kind of like a fuse. It sees that theres is a overload somewhere (dont know where from) and switches off the eletrical circuit to avoid biger damages.
Go thing is that its resetable like turning on again so we ont have to carry fuses around where we go.
I dont know how much mine can handle. Also dont know yet how much my power module has in amps matter. But lets say that my controller is a 50amps, so it can only sucks out 50A max from the baterry at a given point, when in effort. So does it mean my circuit breaker also is 50A so that way it shut all down in a case of a overload to protect baterries to get that big puch that maybe they could not handle?
If so, it means that a circuit breaker is another protector when it come to the BMS issue.
Having this much protections such as the power module controller that only comands the entire chair to drain only untill the amount of amps it is suposed to, the circuit breaker with the same principle, a large Ah capacity and large C rate cells that have the double or more times the capacity that the circuit can drain it (remind me if im forgetting something) to prevent it to discharge so drasticly and kill the baterry, what job can a BMS do in the midle of this?