Porblem: Cell voltage reading on BMS is not accordane with on multmeter when no load
- Incorrect battery type setting
- Cell wireing harnesses not connected to the BMS correctly
- Cell tap wiring error
- Cell impedance is very large
- Internal damage to the BMS
Note: if the BMS has been damaged by previous wiring errors, do not continue to usd the BMS, Contact Chargery for evaluation and repair.
Resolving the issue:
- Disconnect all cells from BMS, all cells must be opening. measure each cell voltage on 9pin connector with multi-meter, record each cell voltage.
- don't measure it on each cell positive and negative.
- don't measure it when cells connected to BMS.
- Don't connect cells to BMS, discharge whole battery at around 1A or less for 3 minutes, measure wrong voltage cell on 9pin connector, record it. if a cell voltage drop very large, or easy to find the voltage drop, please record the cell number, the cell has a higher impedance.
- Power BMS by external power supply , and turn it on. check and record cell voltage readings on BMS. the higher impedance cell voltage will be accordance with voltage measured on step 1.
- Power BMS by battery, and turn it on. check and record cell voltage readings on BMS. the higher impedance cell voltage will not be accordance with voltage measured on step 1.
- Turn BMS off, disconnect all cells from BMS, measure the resistance of pins on socket, such as 1+VS 1-. 2+ VS 1+, 3+ VS 2+, and so on. if any resitance value is less than 50ohm, means there are parts are being damaged.
- Send us the data on step 5, We will check and fix it after returned to us.
from step 3 and 4, check wire connetion on battery, or exchange high impedance cell to solve the issue. from step 5 confirm if the BMS is damaged.
Problem: BMS or DCC don't work or smoking
- Wrong intallation
Resolving the issue:
The Chargery DCC must be installed on battery positive and the ISO board (it is ship with DCC) must be installed between BMS and DCC. on earlier DCC version, the DCC should be installed on battery negative ( as same connection diagram as showed on BMS manual due to no ISO board.
The latest connecion diagaram that is showed DCC installed on battery positive, check the DCC manual.
DCC open ( disconnect charge or discharge) or close ( charging or discharging) is only controlled by BMS, the STATUS LED on DCC indicate the DCC open ( LED off) or close ( LED ON).
If DCC connection is correct, but don't charge or don't discharge, please check if warning events occurs on BMS LCD.
Thera are two LED on iso board, both LEDs indicate BMS control signal (one is charge control, another is discharge control), if LED is on, means without any warning occurs, DCC can charge or discharge.
Two terminals A and B has no difference, because of the DCC is bidirectional, current can flow from A to B, or from B to A.
There is a power swithcher on DCC, the switcher is always turned on FINALLY, That is to say, DCC should be installed or connected to battery, charger or inverter(loads) , ISO borard should be connected to BMS and DCC first, finally turn DCC on. the power LED and STATUS LED will be on, means the DCC is closed, and ready to flow dicharge or charge current.