Vesc6 GVDD under voltage fault.

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district9prawn
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Vesc6 GVDD under voltage fault.

Postby district9prawn » 15 May 2018, 15:35


Duo420
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Joined: 09 May 2018, 20:08
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Re: Vesc6 GVDD under voltage fault.

Postby Duo420 » 17 May 2018, 18:11

Hello, I new to VESC I my vesc is not working right now but to my mind you fried the mosfets somehow. Looking at the schematic the resistance from the lower fets of the ground to the gate should be 35k as there is a resistor there. I could be wrong but do you know how to test the fets with the multimeter. As the gates of the low side are connected to gnd trought the resistor after charging the gate the mosfet should let current trough and then close as the gate discharges trough the resistor.
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district9prawn
Posts: 4
Joined: 08 Apr 2018, 10:40
Location: Sydney
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Re: Vesc6 GVDD under voltage fault.

Postby district9prawn » 18 May 2018, 04:27

The fets checked out fine and it ended up being the drv. No idea how but replacing it did the trick.

Ah the drv....

district9prawn
Posts: 4
Joined: 08 Apr 2018, 10:40
Location: Sydney
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Re: Vesc6 GVDD under voltage fault.

Postby district9prawn » 05 Jun 2018, 12:39

I was having this same problem on another HW6 board I was soldering. In this case it turned out that some solder mask had peeled back on the DRV ground pad and the tinned area of ground pad extended all the way up to some pins, shorting gate drive to ground. At least it was able to be fixed with reflow only with no need to remove the DRV.


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