Zeva BMS settings for 72v and 2nd module ?
 

Hey, I have seen some setting you guys recommend for the 57Vmax systems. Just checking to see what you think about my settings. It was a 72V system with 6 12v FLA batteries. Now will have 10 Leaf modules with EVMS v3 and two modules. I don't care to charge it super high, so maxing out at 82v or less is fine with me.

Also, it is only recognizing one of the modules. Is there something I need to do to make it see them both? I told it that Module 0 had 10 cells and Module 1 had 10 cells. (Also use Module 1 and Module 2 but that made no difference). It knows there are 20 cells, but only recognizing 38v and one module.

Thanks

Re: Zeva BMS settings for 72v and 2nd module ?
 

When You say You also used module ID 1 and 2, did You also change the ID in the modules themselves?

Did You use a terminator on the end of the CAN bus or just a long string with the EVMS monitor at the end?

Re: Zeva BMS settings for 72v and 2nd module ?
 

Sergio, I sent Mark aluminum pack plates and this wiring diagram to put together his 84V pack for an old EZGO TXT rebuild. Pick it apart if it needs it. He is using a TC charger and no contactor for LV protection.

Re: Zeva BMS settings for 72v and 2nd module ?
 

Diagram looks nice as usual, the only suggestion is to put orientation notes on the Hall current sensor, the cable from pack positive entering the back (black) side and out of the front (blue) side towards the Anderson connector.

It seems like a configuration issue, the dialed module ID not matching the configuration settings or perhaps set to "parallel" strings.

I think You should also reconsider the LV safety system, that is a very expensive BMS setup not to protect the lithium cells during a low voltage condition when all that is needed is less than $5 for a 12v relay.

Re: Zeva BMS settings for 72v and 2nd module ?
 

See answers above. What are your thoughts on this system for the LV relay control? Attaching a pdf of the EVMS3 manual for reference.

Link to the EVMS3 system description with different info than the EVMS3 manual.
https://www.zeva.com.au/index.php?product=131

Re: Zeva BMS settings for 72v and 2nd module ?
 

That EVMS3 is a nice BMS designed for cars and I would take advantage of a couple of its internal features.

I would not use big contactors for LV, don't like them for any setup.

If the cart in question can handle the key switch power being shutdown in case of a cell LV condition, the simplest way to use the existing configuration is to power the existing "Key Switch" relay from the BMS "Main Contactor" 12v output.

That output comes ON when the BMS "Key In" gets 12v and goes OFF when an error condition exists or the BMS goes to sleep.

You can also add an additional 12v relay (powered by the "Main Contactor" signal) that acts as an ON/OFF switch for any appropriate signal to disable the Controller in case of any cell LV condition.

I would also get a couple of 12v LED indicator lights and program the MPO1 and MPO2 outputs.

The EVMS3 has an SOC warning set that can be used to indicate the SOC is getting low, like a "reserve" low-gas in a regular cart.

Set the "SoC Warning" setting to 20% or 30%.

Program MPO1 for "Low SoC Signal" and connect it to the positive of a Yellow LED indicator.

Program the MPO2 as "Overtemp Signal" and connect it to the positive of a Red LED indicator light.

Re: Zeva BMS settings for 72v and 2nd module ?
 

Great suggestions and comments as usual!!

Re: Zeva BMS settings for 72v and 2nd module ?
 

Thanks for the tips and advice guys. I am not sure about "parralel" settings so I will look into it. The modules are 0 and 1 and they are both indicated in the BMS to have 10 cells each. The BMS shows 0v for all of the cells in one of the modules, and shows about 3.8 for all of the other cells in the other module. DVM shows proper voltage at the modules, checked individually.

Not sure if this is an issue, but, I may have smoked the resistor on the charger plug. I will attempt to post a pic of it next. I had the CANH and the CANL of the charger plug wired up to the CAN+ and CAN- up at the Hall Sensor. So, in the CANBUS line, I erroneously had + and - running to the resistor. I was getting 120ohms when I checked resistance.

Also, when the BMS has 12v running to it, but no 12v going to the "key in" lug, I can program the BMS on the monitor. If I attach the Key in wire to the 12v source, I get an error message and beeping on the monitor that will not allow me to do anything.

A little confused, will keep digging, but do appreciate your input as well.

Thanks

Re: Zeva BMS settings for 72v and 2nd module ?
 

This is a picture of the back of the plug and the resistor that may have been smoked

Re: Zeva BMS settings for 72v and 2nd module ?
 

If you haven't already, I suggest that you print this manual and go thru it step by step for a better understanding of the EVMS complete operation.