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REC and WS500 User Forum

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Warning: Internal Failure

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Good Day,

I got a single, seemingly random, "Warning Internal Failure" from the Q BMS. No alarms are visible, now. Should I be concerned?

A.

This error can have several causes and some of them are coded to self heal.  There may be a bit of info in the error  log that might help but it might need to be reset first.

Try using the ERRO command on page 13-14 of the manual but it may need to be cleared first.

What is the simplest way to send it a command? I have the WiFi module and the BMS is connected to a Cerbo GX.

On the Firmware page log in using your serial number without the first hyphen.  Like 1Q-1234  CAPS on.

scroll down the Firmwar page to the Manual Commands section and enter your command.

This video is for the Master but the steps are the same.  Start at about 3:38

Perfect, thanks. For some reason I can't seem to get it to unlock. I'll try a different browser…

This is pretty strange, it tells me password doesn't match no matter what I do. Have you seen that before? Should I try restarting the WiFi module?

you need to be connected to the BMS in order to log in, not just your WiFi module.  If you are getting your battery parameters on the Home page you are connected.

Password is your serial number without the first hyphen

You must have the CAPS on

 

Yeah, I get that, it's connected properly and reading all data. I see the request go to the module with the password in it, but it fails.

Can that password be changed? i.e. did I change it without making note that I did?

I'm stumped. I'm remote at the moment, so my requests are coming from an IP on a different subnet than the WiFi module, in case that matters. Pretty sure I've unlocked it before, though.

I loaded the logs and happened to catch an error:

I assume > 50ºC is bad? The cabinet around it is not that warm, clearly.

The only way your password can change is if you were to update your BMS firmware with the wrong BMS firmware bin file.  Your wifi firmware update will not affect it.  If you have done an update, check the name of the bin file you uploaded to get the serial number info.

The temp sensors use a 1wire network so it looks like there might have been a bit of noise that caused that one blip.  Looks like it is nothing to worry about.

I don't think I updated the BMS. It's currently running v2.7 and I purchased it from you around a year ago.

I don't think the temperature spike was spurious, since it clearly happened after balancing had occurred for about 20 minutes, which I would expect to generate heat.

Hi @rick_tech_support,

Seems the BMS throws the internal error every time it has been balancing for a while.

I'm correlating the data and it appears the error is thrown 10 minutes after balancing begins, while the ambient temperature is around 28ºC. During today's cycle, the lowest cell was 3.46 V and the highest was 3.58 V (280 Ah x 8 cells). What do you think?

I have not ever seen this one before so I can not help but if you reach out to tine@rec-bms.com he might have some insight.

@tine

If the BMS has to work hard to balance the cells (new not pre-balanced cells or old cells ) it heats a bit over the set threshold. BMS only signals ERROR 5 by red LED, not sound alarm and sends internal alarm to Victron.

 

Quote from Tine Andrejasic on June 1, 2022, 5:52 am

If the BMS has to work hard to balance the cells (new not pre-balanced cells or old cells ) it heats a bit over the set threshold. BMS only signals ERROR 5 by red LED, not sound alarm and sends internal alarm to Victron.

I did pre-balance the cells before putting them in service, but they are the usual low-quality Chinese parts, so who knows. The warning is recent, while the system has been in service for six months. However, the ambient temperatures have recently increased substantially.

Impedances and voltages from the BMS:

ImpedanceVoltages

Do those numbers indicate a problem?

Thanks for your input, I really appreciate it.

A.

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