6 Common Seplos BMS Software Issues You Might Encounter and How to Solve Them

1. The balance board cannot be started

Cause of failure one： The sampling line of the equalization board is connected incorrectly

Note: When assembling the battery, pay attention to the connection of the balanced sampling line

Cause of failure two： The balance board resistor is burned out

Note： Be careful not to insert the black and white row plugs of the sampling line of the equalization board backward.

2. BMS cannot start

Cause of failure one： The B+ line connecting the battery and BMS is not installed. The B+ line is the power line of the BMS. The battery must be connected to start the BMS.

Solution： Check if the B+ line is connected

Cause of failure two： The BMS component MCU was broken down

Note： When assembling, the B+ line should be installed on the BMS board first, and then connected to the battery terminal to prevent the B+ line from being connected to the battery first, and then the line terminal connected to the BMS, accidentally touching the components on the BMS.

How to judge whether the MCU has been broken down: Use a multimeter to check whether the position shown in the picture is normal. If the measurement shows 3.3V, it is normal.

3. BMS sampling abnormality, LED light does not light up

Cause of failure： There is a problem with the resistor on the BMS

Solution： Use a multimeter to measure the corresponding resistor to see if there is any abnormality in the resistance value. If so, the corresponding resistor needs to be replaced.

Normal resistance value：

R228=1206/0R resistance，

R202、R203、R204、R205=0603/0R resistance

Rn1=0805/51R resistance，

N1=NTC thermistor/10K

4. BMS cannot be charged or discharged

Cause of failure： The BMS component is broken down, and the resistance value is Ω level

Troubleshooting： Use a multimeter to measure the charge and discharge of the BMS MOS tube：

G\S pin The resistance value is about 4.2K, which is normal.

G\D pin The resistance value is K level or M level, which is normal.

S\D pin The resistance value is K level or M level, which is normal.

5. Temperature controlled battery 4 appears -50℃

Cause of failure： The temperature control of the sampling board is abnormal.

Solution： The PCB board needs to be replaced. If you need to use the battery temporarily, you can connect to the host computer to turn off the low-temperature protection function. After replacing the PCB board, first check whether the parameters are normal. If they are normal, you need to turn on the low-temperature protection function.