Inconsistent cell voltages in freemaster - HVBMS800SCTBUN

[ShivaB]

Hi,

We are using HVBMS800SCTBUN and successfully flashed the demo model (k358bmu_read_s32ct). However,when we were monitoring the voltages, the voltages of last module display differently . This is happening for few cells. Please see the snap below.

1. Kindly help on how to resolve this issue ? 

2. When we are changing voltages, some voltages are updated faster and others are slow. Is there any reason for this behaviour ? 

[ShivaB]

I have the same issue today but now its last 4 cells which are inconsistent..previously it was last 6 cells. Please suggest or help on resolving this issue.

[mariuslucianand]

Hello @ShivaB,

To be honest, I have never encountered this issue before. If you are using the HVBMS 800V kit connected to the 18 cell emulator,  all the 3 BCCs are connected in parallel to the same potentiometers. If the CID 1 and 2 delivers the expected voltages constantly and the CID 3 sometimes 4 or 6 makes me think there might be a loose cable somewhere. Could you try swapping some cables and check the results?

Marius

[ShivaB · Accepted solution]

Hi Marius, this issue was because I used incorrect elf file inside free master . After using the right one it works fine. I managed to figure his out and this is resolved now.

[mariuslucianand]

@ShivaB , I am glad you have solved this issue, and thank you for sharing the solution!

Regards,
Marius

[ShivaB]

Note: The slowest is 5 seconds delay

[mariuslucianand]

Hello @ShivaB 

What you are seeing on the FreeMASTER regarding the delay is somehow normal. FreeMASTER is communicating over UART and tries to request a lot of values each 100ms over an 115200 baudrate.

mariuslucianand_0-1732224556023.png

What I have tried, and you could do the same on your side is to create a simple Watch Subblock in the FreeMASTER to add only the last value from each battery cell controller. In my case case this resulted with no delay to the values.

mariuslucianand_1-1732224912579.png

Hope this helps,

Marius