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Victron Lynx Smart BMS 500 Manual

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• Contactor failure - Red LED flashing 10 times every 4 seconds
• Hardware error - GX device alarm Calibration lost - GX device alarm
10.2. Lynx Smart BMS operational issues
High discharge current
A high current alarm is given when the current is more than 600A for more than 5 minutes. The red LED flashing 8 times every 4
seconds. Reduce the loads connected to the Lynx Smart BMS so that the current through the Lynx Smart BMS will be below
500A.
High charge current
A high current alarm is giving when the current is more than 600A for more than 5 minutes. The red LED flashing 8 times every 4
seconds. Turn chargers off so that the current through the Lynx Smart BMS will be below 500A.
Contactor (relay) issues
The Lynx Smart BMS is equipped with 3 protections:
Over current protection: An alarm is generated when the current exceeds 600A for 5 minutes.
Contactor voltage monitoring: An alarm is generated when the voltage over the contactor is higher than 0,5V. A high voltage
indicates high resistance and high power dissipation indicating a bad contactor.
Electrical/mechanical protection: There are 2 thermal switches mounted on the busbar. The contactor opens and an alarm is
generated when the temperature of the busbars becomes higher than 130°C.
High BMS temperature
Check ambient temperature and check if the fans are running. Reduce the ambient temperature.
Settings invalid
Settings data is corrupt, reset to factory defaults.
10.3. BMS issues
10.3.1. The BMS frequently disables the battery charger
A well-balanced battery does not disable the charger, even when the batteries are fully charged. But when the BMS frequently
disables the charger, this is an indication of cell imbalance.
In case of moderate or large cell imbalance it is an expected behaviour that BMS frequently disables the battery charger. This is
the mechanism behind this behaviour:
As soon as one cell reaches 3.75V the BMS disables the charger. Whilst the charger is disabled the cell balancing process still
continues, moving energy from the highest cell into adjacent cells. The highest cell voltage will drop, and once it has fallen below
3.6V the charger will be enabled again. This cycling typically takes between one and three minutes. The voltage of the highest
cell will rise again quickly (this can be in a matter of seconds) after which, the charger will be disabled again, and so forth. This
does not indicate a problem with the battery or the cells. It will continue with this behaviour until all cells are fully charged and
balanced. This process might take several hours. It depends on the level of imbalance. In case of serious imbalance this process
can take up to 12 hours. Balancing will continue throughout this process and balancing even takes place when the charger is
disabled. The continued enabling and disabling of the charger can appear strange but rest assured that there is no problem. The
BMS is merely protecting the cells from over voltage.
10.3.2. The BMS is prematurely turning chargers off
This could be because of a cell imbalance. One cell in the battery has a cell voltage above 3.75V. Check the cell voltages of all
the batteries that are connected to the BMS.
10.3.3. The BMS is prematurely turning loads off
This could be because of a cell imbalance.
If a cell has a cell voltage below the "Allowed to Discharge" setting in the battery the BMS will turn the load off. The "Allowed to
Discharge" level can be set between 2.6V and 2.8V. The default is 2.8V.
Check the cell voltages of all the batteries that are connected to the BMS using the VictronConnect app. Also check if all batteries
have the same "Allowed to Discharge" settings.
Once the loads have been turned off due to low cell voltage, the cell voltage of all cells needs to be 3.2V or higher before the
BMS will turn the loads back on.
Lynx Smart BMS
Page 30 Troubleshooting and Support
… 33 …


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