Hi Dave
So glad that you have a new controller and have come back to play! ha ha, yes as Lowell says there are insulating washers under each finger (each fet sits on its own little block of aluminium) under that there is a fibre tab washer of the same size so essentially its totally insulated gate to gate.
Yes yours has the washers and tubes, I honestly don't know why they do it this way as they use a tab kit on the voltage regulator? its very odd it may not be the only reason the stock controllers fail at higher voltages but It cant be helping, the gates can get false triggers if they are shorting out not good news at all and some were a few k ohms and some were total shorts! not good at all.
I hope you have more luck this time around however I do worry that the stock controller may have an issue, what is strange is that some of the older controllers don't seem to be having a problem like my original one and Xysters one etc? something has changed but this is a definite problem they need to address and address quickly unless they want all their controllers shipped back, for the sake a few pennies I cant see why they don't do it properly in the first place?
The modified controller is running just fine, may step it up to 48V in the next few days to see how it fares, it runs cool and is fast with some great low down grunt, these Pumas outperform my bike on low down power and are a match at the top end as well, I am going to be running a Puma on my bike my main bike to see how it fares, my controller on my main bike is old but reliable and does run at 72V on the USPD ok so it will be interesting to see if the Puma is happy on it.
Good luck with your ride mate, If its going to go it will go quite quickly on you, you may get a warning if you fit phase fuses inline like I did, put 50A fuses in 2 of the legs going to the motor, if it starts blowing fuses then I suspect you will have the same problem, the fuses are not quick enough to catch catastrophic failures but they may indicate something is going wrong, I found this on the BMX, it would be ok for a while at 48 and 72V then it would start blowing fuses, it maybe a motor temp thing as well? however when my BMX controller blew it was a freezing cold December night and the motor was Ice cold so I doubt it was that and when the 26 Inch Puma controller let go it was a cold night and it let go within about 30 seconds of opening the throttle a little, so me thinks the problem is at least part due to those washers and partly due to the fets. I have never had a failure when I had fuses fitted inline, the fuses blew but no controller failures.
Time will tell how this all goes! you never get anywhere if you don't try and you will always have to accept failures along the way, were kind of pushing the limits of the technology which is fun but can also be frustrating!
Good luck
Knoxie
