Skip to Content

3.3 Control

Version 3.1 by Admin on 2024/12/12 17:25

Settings

Control

General parameters

General parameters of BMS Main 3X are configured in the «Control → General» section:

1734023979572-693.png

  • Initialization delay – a delay before processing functions after finishing device initialization (initialization includes current sensors calibration and battery modules search), millisecond.

Battery modules

The BMS Main 3X allows up to 32 battery modules with BMS Main 3 onboard to be connected in parallel.

Flags for enabling battery modules are configured in the "Control → Modules → Enable (modules 1 to 8)" and "Control → Modules → Enable (modules 9 to 32)" section:

1734023979582-179.png

The network addresses of the battery modules are configured in the "Control → Modules → Node IDs (modules 1 to 8)” and "Control → Modules → Node IDs (modules 9 to 32)”:

1734023979583-589.png

Each module in a battery must have a unique address. You can change the address in the battery module settings in the “Connectivity → CAN” section of the BMS Main 3 settings.

Calculation of battery parameters

The BMS Main 3X device calculates battery parameters based on user settings.

Calculation of the battery state of charge (SOC) is configured in the "Control → Calculation → Final SOC" section:

1734023979584-480.png

The following battery SOC calculation methods are supported:

  • Minimal SOC – SOC of the modular battery is assumed to be the minimum SOC among the battery modules;
  • Average SOC – SOC of the modular battery is taken equal to the arithmetic average of the SOC of the battery modules;
  • Min-Max SOC – SOC of the modular battery is calculated based on the minimal and maximum SOC of the battery modules (recommended).

Calculation of the battery state of health (SOH) is configured in the "Control → Calculation → Final SOH" section. The following battery SOH calculation methods are supported:

  • Minimal SOH – SOH of the modular battery is assumed to be the minimum SOH among the battery modules;

Average SOH – SOH of the modular battery is taken equal to the arithmetic average of the SOH of the battery modules.

Main contactor

The BMS Main 3X device controls the main contactor. The main contactor is usually placed in the common (minus) battery line for opening the charge and discharge circuits in case of sealing of the charging or discharging contactors.

The Main contactor algorithm supports the following modes:

  • Always on;
  • Automatic, when the main contactor closes by the internal charging and discharging algorithms at the same time with Precharging, Charging and Discharging contactors.

In “Always on” mode, the main contactor closes if all the following is true:

  • “Charging” contactor is open;
  • “Discharging” contactor is open;
  • there are no errors.

In “Always on” mode, the main contactor opens if “Charging” and “Discharging” contactors are open and any of the following is true:

  • “Charging current present” is set;
  • “Discharging current present” is set;
  • one or more errors persist.

To change the parameters of the main contactor, select the "Control → Main contactor" section:

1734024131196-608.png

In this section:

  • Enable – a flag to enable the main contactor control;
  • Algorithm – main contactor control algorithm:
    • Always on – contactor is always closed;
    • Automatic – contactor closes by internal charge and discharge algorithms;
  • Time to keep the contactor closed before closing the others – a time for other contactors to be open after the main contactor is closed, millisecond;
  • Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, millisecond;
  • Keep the contactor open until the device is restarted – a flag for keeping the main contactor open until the system is reset;
  • Errors 1 (2) to open the main contactor – error flags that cause the contactor to open.