tanveerhabib

Here is the chopper DC side legs picture, can that be the reason for heating of the mosfets

Hello, I have gone through this manual which you have shared and the inverter which I am repairing is exactly the same, I am attaching an image from the same tutorial, and I have marked a part which is of green colour which is totally blown out, I think may be the error 57 is because of it, and can you tell me what is it?
New Bitmap image.bmp

Looks like SN74LVC1G08DBVR  C08J SOT23-5 single 2-input positive and gate. 

Ok, i learnt alot from you and @Coulomb. Thanks for your expert advices here 

Ok, i learnt alot from you and @Coulomb. Thanks for your expert advices here 

@Coulomb , @JustinSchoeman   :  ok  on Justin's suggestion that it could be caused by the gate discharge 0R resistor via steering diode , I took the liberty of removing the the 0R resistor , and ,yes, that's the cause of the 'spike' .
Below is pulse capture with the standard circuit :
 

 
And here is the capture of the 0R resistor removed, leaving the gate driver with only the main 22R resistor
 

 
Now its pretty symmetrical.
I have learned via google search that IGBT has typically a slower turn off time in relation to turn on , and in relation to mosfets. Probably the reason for the heavier gate discharge needed when turning off , and hence the steered 0R resistor.
 
EDIT : I have finally decided that if I want to maintain the repairing 'journey' , then a SMD rework station is a must . So this week I purchased one as an early Christmas present ! Its a generic Chinese model , but it just works for me .  It has a fan for blowing hot air  , instead of a piston pump as per expensive models , but still very impressed. I have removed the 0R resistor literally within seconds , and replaced it in seconds . Should have done this when I started repairing. But so we learn.

Oh dear, I see you reffering to VMIi, I was thinking about another thread that reffered to MAX 11. Apologies.🙈🙈

In the above manual there is one 100 ohm resistors before zd 12 and zd6 and there is another 100 ohm resistor before zd 20 and zd 21 but the schematic which you shared here https://forums.aeva.asn.au/viewtopic.php?p=88434#p88434 does not have those resistors included so if we don't put resistors there what will happen or if you put 10 ohm resistors instead of 100 ohm what will happen.
 
thank you, I love to watch you here on this forum for your expert advices.

That's the printed circuit assembly part number, not the inverter serial number.
Use the VM II service manual I uploaded to this forum this morning. Perhaps also the attached check guide.
The most likely culprits are the 16 MOSFETs. At least one pair will be shorting battery + to battery -.
I've only ever seen 200 A fuses in 5 kVA models. And they very rarely if ever blow. Clear the short before trying again.
 
3-5KVA GE check manual 20170203-2 13 13-17.pdf