SettingsThe BMS Main 3 device continuously monitors the state of the cells, the external environment and, when detecting abnormalities, protects the battery and system components from damage.The BMS Main 3 device continuously monitors the state of the cells, the external environment and, when detecting abnormalities, protects the battery and system components from damage.

Protections

The BMS Main 3 device continuously monitors the state of the cells, the external environment and, when detecting abnormalities, protects the battery and system components from damage.

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      1. Overcurrent

The BMS Main 3 device performs the overcurrent protection depending on current sensor values.

To change the overcurrent protection of the battery, select the "Protections → Overcurrent" section:

In this section:

• Enable – a flag to enable the protection;
• Maximum charging current, А;
• Tolerant charging current, А;
• Maximum discharging current, А;
• Tolerant discharging current, А;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Lock – a flag to block the error until the device is restarted.

As a result of operation of the overcurrent protection, the "Overcurrent" error is generated.

Error generation conditions:

• the current is positive (charging), and its modulo value is greater than the “Maximum charging current” value for the “Delay before setting the error” time;
• the current is negative (discharging), and its modulo value is greater than the “Maximum discharging current” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the current is positive (charging) or zero, and its modulo value is less than the “Tolerant charging current” value for the “Delay before clearing the error” time;
• the current is negative (discharging) or zero, and its modulo value is less than the “Tolerant discharging current” value for the “Delay before clearing the error” time.

If there is the "Overcurrent" error, the charging contactor and discharging contactor open.

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      1. Undervoltage

The BMS Main 3 device implements battery protection from too low voltage on the cells.

To change the battery protection parameters from low voltage on the cells, select the "Protections → Undervoltage" section:

In this section:

• Enable – a flag to enable the protection;
• Minimum cell voltage, V;
• Tolerant cell voltage, V;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Lock – a flag to block the error until the device is restarted.

As a result of the operation of battery protection from low voltage, the "Undervoltage" error is generated.

Error generation conditions:

• the minimum voltage among all cells of the battery is less than the “Minimum cell voltage” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the minimum voltage among all cells of the battery is greater than the “Tolerant cell voltage” value for the “Delay before clearing the error” time.

If there is the "Undervoltage" error, the discharging contactor opens.

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      1. Overvoltage

The BMS Main 3 device implements battery protection from too high voltage on the cells.

To change the battery protection parameters from high voltage on the cells, select the "Protections → Overvoltage" section:

In this section:

• Enable – a flag to enable the protection;
• Maximum cell voltage, V;
• Tolerant cell voltage, V;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Switch off the discharging contactor on error – a flag to open the discharging contactor when the "Overvoltage" error is generated;
• Lock – a flag to block the error until the device is restarted.

As a result of the operation of the battery protection from high voltage, the "Overvoltage" error is generated.

Error generation conditions:

• the maximum voltage among all cells of the battery is greater than the “Maximum cell voltage” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the maximum voltage among all cells of the battery is less than the “Tolerant cell voltage” value for the “Delay before clearing the error” time.

If there is the "Overvoltage" error, the charging contactor and discharging contactor open (if the “Switch off the discharging contactor on error” flag is set).

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      1. Low temperature

The BMS Main 3 device implements battery protection from too low temperature.

To change the battery protection parameters from low temperature, select the "Protections → Low temperature" section:

In this section:

• Enable – a flag to enable the protection;
• Minimum charge temperature, °C;
• Tolerant charge temperature, °C;
• Minimum discharge temperature, °C;
• Tolerant discharge temperature, °C;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Lock – a flag to block the error until the device is restarted.

As a result of the operation of the battery protection from low temperature, the "Low temperature (CH)" and/or “Low temperature (DCH)” error are generated.

Error generation conditions:

• the minimum temperature among all cells of the battery is less than the “Minimum charging (discharging) temperature” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the minimum temperature among all cells of the battery is greater than the “Tolerant charging (discharging) temperature” value for the “Delay before clearing the error” time.

If there is the "Low temperature (CH)" error, the charging contactor opens. If there is the "Low temperature (DCH)" error, the discharging contactor opens.

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      1. High temperature

The BMS Main 3 device implements battery protection from too high temperature.

To change the battery protection parameters from high temperature, select the "Protections → High temperature" section:

In this section:

• Enable – a flag to enable the protection;
• Maximum charge temperature, °C;
• Tolerant charge temperature, °C;
• Maximum discharge temperature, °C;
• Tolerant discharge temperature, °C;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Lock – a flag to block the error until the device is restarted.

As a result of the operation of the battery protection from high temperature, the "High temperature (CH)" or “High temperature (DCH)” error is generated.

Error generation conditions:

• the maximum temperature among all cells of the battery is greater than the “Maximum charging (discharging) temperature” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the maximum temperature among all cells of the battery is less than the “Tolerant charging (discharging) temperature” value for the “Delay before clearing the error” time.

If there is the "High temperature (CH)" error, the charging contactor opens. If there is the "High temperature (DCH)" error, the discharging contactor opens.

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      1. Battery cover

To change the protection parameters from opening the battery cover, select the "Protections → Battery cover" section:

In this section:

• Enable – a flag to enable the protection;
• Delay before setting the error, millisecond;
• Delay before clearing the error, second;
• Lock – a flag to block the error until the device is restarted.

As a result of the operation of the protection against opening the battery cover, the “Battery cover error” is generated.

Error generation conditions:

• there is a signal from the battery cover during the “Delay before setting the error” time.

Conditions for removing the error:

• no signal from the battery cover during the “Delay before clearing the error” time.

If there is the "Battery cover error", the “Critical error” is generated and all contactors open.

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      1. High humidity

The BMS Main 3 can detect that the battery is operating in high humidity conditions.

To change the detection parameters, select the "Protections → High humidity" section:

In this section:

• Enable – a flag to enable the detection;
• Maximum humidity, RH%;
• Tolerant humidity, RH%;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Lock the error until the device is reset.

As a result of the operation of the battery protection from high humidity, the "High humidity" error is generated.

Error generation conditions:

• the measured humidity is greater than “Maximum humidity” during the “Delay before setting the error” time.

Conditions for removing the error:

• the measured humidity is less than the “Tolerant humidity” during the “Delay before clearing the error” time.

If there is the "High humidity" error, no action is taken. The error is indicative.

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      1. Water

The BMS Main 3 can protect the battery from working in very high humidity conditions.

To change the protection parameters, select the "Protections → Water" section:

In this section:

• Enable – a flag to enable the protection;
• Maximum humidity, RH%;
• Tolerant humidity, RH%;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Lock – lock the error until the device is reset.

As a result of the operation of the battery protection from water, the "Water" error is generated.

Error generation conditions:

• the measured humidity is greater than the “Maximum humidity” value during the “Delay before setting the error” time.

Conditions for removing the error:

• the measured humidity is less than the “Tolerant humidity” value during the “Delay before clearing the error” time.

If there is the “Water” error, the “Critical error” is generated and all relays open.

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      1. High Logic temperature

To change the overheating protection parameters of BMS Logic devices, select the "Protections →  High Logic temperature" section:

In this section:

• Enable – a flag to enable the protection;
• Maximum temperature, °C;
• Tolerant temperature, °C;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Lock – lock the error until the device is reset.

As a result of the operation of the protection from high temperatures of BMS Logic devices, the "High Logic temperature" is generated.

Error generation conditions:

• a BMS Logic device temperature is higher than the “Maximum temperature” value.

Conditions for removing the error:

• a BMS Logic device temperature is less than the “Tolerant temperature” value.

Cell balancing is prohibited for overheated Logic devices.

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      1. Logic offline

To change the protection parameters from loss of communication with BMS Logic devices, select the "Protections → Logic offline" section:

In this section:

• Enable – a flag to enable the protection;
• Lock – lock the error until the device is reset.

As a result of the protection from loss of communication with BMS Logic devices, the "Logic offline" error is generated.

Error generation conditions:

• at least one of the connected BMS Logic devices does not respond to the commands of the BMS Main device for 10 seconds.

Conditions for removing the error:

• all connected BMS Logic devices respond to the commands of the BMS Main device.

If there is the "Logic offline" error, the “Critical error” is generated and all relays open.