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Explanation No. 6 in this lesson,right part number but it's it's very similar uh i uh this information is at pyroswitch.com you can go look at the different pyro switches that are made by auto leave but anyway I thought it was very interesting i totally disassembled this yesterday and then put it back together as you can see in these photos .
New console top performance:
it has a little circuit board it has a shunt circuit a parallel current circuit uh where it appears to be watching the amount of current going through the pyro switch so this is a pyroswitch made by auto leave there's a circuit monitoring the current going through it and once the current going through it reaches some predetermined level I don't know what that is uh on the press release for the p90d it said 1500 amps but the P100D is even more powerful so it it probably has a higher rating but as soon as it gets to whatever rating tesla has decided it's going to cap it at then it'll apply a voltage and it gives a a certain voltage to fire it's 1.75 amps for half a millisecond and then it physically breaks open this high voltage DC circuit and of course there'll be an arc flash at that high current but it has a little area to contain the arc flash and anyway it's an impressive impressive little unit I understand there's one for the Model 3 and the model y uh also okay so these what that means why should you care about the pyrofuse or a fuse is that any of these cables here any of these high voltage cables if you were to get in an automobile accident and pinch any of these cables to the vehicle chassis pinching just one of them won't do anything other than trigger trouble codes for something called loss of isolation and i have different uh training videos on those but if both of them get pinched through to the chassis or if they get pinched to each other then that creates a short circuit and rather than creating a short circuit that could cause say a fire they open the circuit very quickly this opens within 0.5 milliseconds 500 microseconds so that is to try to prevent fires from starting from high voltage circuits and possibly from fuses that don't open at a predictable time okay well let's follow the the cables now to the front of the vehicle and see what they connect to okay I'm on a different workbench now to assemble and connect all of the high voltage components from a tesla model s that are in the front of the vehicle on the second generation tesla model s so i have the positive and negative cables that are coming from that rapid splitter assembly on the other table here and I want you to see it's a little over 12 and a half feet long but the cables go all the way over to the other workbench where we were before 12 and a half feet which is approximately 3.84 meters of high voltage shielded cable so where does this go up front it goes to what's called a high power distribution block or module so there are the two cables coming in from the front of the vehicle right here and then we have two cables going out to the front Drive Unit front electric motor and then a bunch of other cables going.
High voltage shielded cables:
to other high voltage components on the front of the vehicle so I have two of these high voltage junction blocks uh let's look inside of the other one I use this one for my actual connections but here is the other one I don't have it all labeled but i have removed the bolts and have taken the cover off of it and i want you to see that inside of here we have four fuses going across the top here there are two 40 amp fuses these two great big ones right there in the middle and then there's a 30 amp fuse right there and another 30 amp fuse on this side so all four of these outputs right here are fused now the cable coming from the front of the vehicle going through is just a straight shot to the front motor the pyro fuse that we talked about protects that circuit but there are fuses in this high voltage distribution block or junction block and this is really hidden away on the vehicle I can't even see it it's above the battery underneath the underneath the vehicle, you would have to remove the battery to even get to this so it's not something that you're just going to be able to do easily this does have right here a little button switch it's an interlock , We move to the explanation number 7 of this lesson.
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