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| Nissan Leaf |
Explanation No. 7 in this lesson,circuit so if somebody takes the cover off like I did and the cables are still connected it should open the contactors in the battery and turn off the high voltage to these or applied to these orange cables all right now there's there are some other circuits in here as you can see there's a circuit board right there as you can see in these photos there's some transistors as it turns out this fuse over here on the right this 30 amp fuse runs its power through some transistors here transistor circuit there I think there's four uh transistors in parallel that control the current going to the battery coolant heater.
The negative cable should be located on the back side:
and so it's not just a straight through always delivered it appears to be a variable amount of of current or just an on-off circuit for the battery heater I don't know which one it is if any of you know then put it in the comments so anyway we have power coming in right here just a straight shot through you can see bus bars that feed these fuses and wiring that feeds these four connectors off to the side and then the straight shot out to the front Drive Unit inverter and we'll take a look at that here in a few minutes so now let's connect these two high voltage cables to our high power distribution module and then we'll see what other components need to be connected it shows the polarity on the side of the module, it shows the positive cable goes in this side negative on this side so we'll put in our negative cable to the backside here has a couple of bolts that hold that in place I'm just going to put one in for the moment and then our net or a positive cable connection right there with another bolt okay so power coming in from the rear of the vehicle on these big long cables coming into our distribution module which just splits it up through four fuses or a straight shot to the the inverter for the front motor so let's look at the inverter for the front motor it has its own harness right here that looks like it's um let's see I actually measured it junction block to the front inverter these are 27 inches long or 0.69 meters each.
Electric motor:
and so we will put these into the output of our high power distribution module with a negative on the inside and the positive on the outside okay power coming in power going out I forgot to show you there is a low voltage logic connection over here most likely to control that circuit board that's in there and to monitor the high voltage interlock circuits so now we will take these two cables that go to the front inverter and connect them to the inverter okay I promised you a video on the front motor from the tesla model s and I'm ready to shoot that video it's just on the next table but I needed to get this done first so this is the inverter assembly off the side of that electric motor the front Drive Unit which is buried if you open the frunk take out the liner, it's buried down underneath it is covered with an insulative material they call an NVH mat (noise vibration and harshness) anyway this is the inverter assembly for the front motor of the tesla model s from the beginning of the model s all the way up through in 2019 when they put in a permanent magnet motor in the front of the model s which from what i read is pretty much the rear motor from the Tesla Model 3. this inverterhas a high voltage connection right here these two ports right here and let's see they've got to be labeled we have a plus symbol right there and a negative symbol right there so our positive cable it's going to connect on the bottom there still had some thread lock on it and then our negative cable right here okay so we've got the connection from our rapid splitter at the rear of the vehicle of the battery all the way through the big long cables to the front of the vehicle to our high power distribution module and then straight through to our front electric motor on the all-wheel-drive vehicle inverter assembly that leaves us four electrical connections we still need to make of high voltage components, we will start with this bottom one here 40 amp fused output power to the air conditioning compressor okay this is our electric air conditioning system compressor this is a variable speed scroll compressor it's made by a company named Hanon Systems out of Korea, this is the , We move to the explanation number 8 of this lesson.