Bank is missing; no cell board is blinking
If no cell board blinks, the problem is between the BMS controller and the positive end board
See also:
Set-up
First you must make sure that, once you fix the problem, the BMS controller is ready to see the bank
- On the terminal, do Home / Set-up / More... / Battery arrangement / Number of cells in each bank / Set manually
Use the '>' or '<' keys to go to that bank
- Enter the number of cells in series in that bank and press Enter
Procedures
- Check the voltage of the most positive cell in the bank: if it's less than 2.0 V, that's the problem
- Check that the bank connector (5 pin) is fully seated in the BMS controller
- Check the wire colors on the 5-pin connector:
- 1 - Red (there is a triangle embossed in the housing; this is the wire closest to the edge of the case when plugged in)
- 2 - Black
- 3 - Shield
- 4 - Green
- 5 - White
- Check the wire colors on the 2-pin connector to the positive end cell board
- 1 - Black (there is a triangle embossed in the housing; the PCB has a square pad)
- 2 - Red
- Check that the cell board on the most positive end of the bank is actually a positive end board
- There is a red dot somewhere on the side of the PCB without components
- On the component side, component OC1 is stuffed, and OC2 is not
- Check that the red and black wires between the BMS controller and the positive end board are OK
- Visually
- By tugging on them
- With an ohmeter
- Measure the complete transmit path, through the cable and an LED in the positive end board
- Disconnect the bank connector from the BMS controller
- Set a Multimeter in the DIODE position (it must be able to read an LED voltage: at least 1.2 V)
- Make sure the meter works: touch the probes together and check that you see a short circuit
- On the flat side of the 5-pin connector, connect the red probe through the small hole, to the socket to which the red wire is crimped
- Connect the black probe to the socket to which the black wire is crimped
- If you see a short circuit:
- Disconnect the 2-pin connector from the positive end board (if no connector, disconnect either the red or black wire)
- See is the short is on the positive end board or across the red and black wires
- If on the cell board, look for a solder bridge across the 2-pin connector; otherwise, replace the board
- If across the red and black wires, look for a loose strand of wire shoring across the wires
- If you see a voltage drop of about 1.1 V, the problem is in the positive end cell board: replace it
- If you see an open circuit:
- Repeat the test, but this time measuring right on the positive cell board
- If you see 1.1 V, the problem is the wiring to the cell board: use the procedure above to find the broken wire or bad crimp
- If you still see an open circuit, the problem is in the positive end board: replace it
- Repeat the test, but this time measuring right on the positive cell board