2. Installation and connection
Installation and connection
Installation procedure
The mounting area of the BMS Logic 2.0 must be protected from mechanical particles (dust, dirt, large objects) and water. The BMS Logic 2.0 is recommended to be placed close to the cells it controls, but away from high current circuits to reduce interference to measuring circuits and increase overall reliability of installation.
The installation site must provide convenient access for subsequent connection to the device’s headers.
The BMS Logic 2.0 has a heat sink to dissipate the heat generated during the balancing of the cells. When used in enclosed enclosures, heat must be removed from the sink, otherwise it may damage the device.
Overall and mounting dimensions of the BMS Logic 2.0 are shown below.
| Parameter | Value |
Overall dimensions (length × width × height), mm | 125 × 84 × 25 |
| Mounting dimensions (length × width), mm | 115 × 50 |
| Mounting holes | M4 |
Headers
The BMS Logic 2.0 is designed to measure battery parameters – temperature (for a stack of 12 cells there are 2 temperature sensors) and the voltages of 12 cells.
X1 – header for cells and temperature sensors
Receptacle Housing: Molex 39012160. Terminals: Molex 5556
| Pin | Name | Description |
| 1 | TEMP2 | Signal from the thermistor #2 |
| 2 | TEMPC | Ground of the thermistors |
| 3 | C11 | Cell #11 |
| 4 | C9 | Cell #9 |
| 5 | C7 | Cell #7 |
| 6 | C5 | Cell #5 |
| 7 | C3 | Cell #3 |
| 8 | C1 | Cell #1 (minimum potential with respect to V-) |
| 9 | V- | Minus of the cell stack |
| 10 | TEMP1 | Signal from the thermistor #1 |
| 11 | C12 | Cell #12 (maximum potential of the cell stack) |
| 12 | C10 | Cell #10 |
| 13 | C8 | Cell #8 |
| 14 | C6 | Cell #6 |
| 15 | C4 | Cell #4 |
| 16 | C2 | Cell #2 |
X2, X3 – headers for communication with BMS Main
Receptacle Housing: Molex 39012040. Terminals: Molex 5556
| Pin | Name | Description |
| 1 | RS485_A | RS-485 line A for communication with the BMS Main |
| 2 | RS485_B | RS-485 line B for communication with the BMS Main |
| 3 | +5V | Supply voltage 5V |
| 4 | GND | Ground |
Switches and indicators
SWD1 – address switch
| Switch number | Description |
| 1 | The first (the lowest) bit of the address. Position ON - bit is 1 |
| 2 | The second bit is the address. Position ON - bit is 1 |
| 3 | The third bit of the address. Position ON - bit is 1 |
| 4 | The fourth bit of the address. Position ON - bit is 1 |
| 5 | The fifth bit of the address. Position ON - bit is 1 |
| 6 | The sixth (the highest) bit of the address. Position ON - bit is 1 |
DS1 – mode indicator
| State | Description |
| Blinking | Communication between the BMS Main and the device is established |
| No light | There is no communication between the BMS Main and the device |
Connection procedure
Connection to BMS Main
To connect the BMS Main to BMS Logic 2.0 do the following steps:
- Connect the BMS Main to the first BMS Logic 2.0 (P15 -> X3).
- Connect the BMS Logic 2.0 to each other (X2 -> X3).
- Install jumper P1 on the last BMS Logic 2.0 in the chain.
Connecting battery cells
To connect the battery cells, follow the picture below. Incorrect connection of the cells can damage the BMS Logic 2.0.
Begin the connection with the negative of the battery: the "V-" of the first BMS Logic 2.0 is connected to "B-", then the first cell (C1) of the battery is connected, then the second (C2), etc. The “V-“ of the next BMS Logic 2.0 is connected to the C12 of the previous BMS Logic 2.0. If not all inputs of the cells are used, then the remaining inputs are connected to the cell with the highest potential.
Connecting thermistors
Thermistors should be fastened to the cells, excluding short circuits to the cell terminals (for example, isolate thermistors with heat shrink). For reliable operation, it is recommended to use all thermistors (1 temperature sensor for 6 cells).
