This page is a quick user guide of the MG Master LV.
Always consult the manual before using the MG Master LV.
The table below shows all the functionalities that can be assigned to a programmable output, including the parameters, of the Master LV.
| Mode | Activated state | Additional settings | Description |
|---|---|---|---|
| Discharge almost not allowed | Close / Open (inverted) | When discharge is almost not allowed anymore, the output will be energized (Close) or de-energized (Open). Conditions: • Battery is almost discharged, there is 5~10% state of charge left. • Battery temperature becomes too high to allow discharge, 2°C offset. • Battery temperature becomes too low to allow discharge, 1°C offset. • System is in fail-safe. • System is going to shutdown. |
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| System activated | Close / Open (inverted) | When the system is activated and ready to use, the relay will be energized (Close) or de-energized (Open). | |
| Warning | Close / Open (inverted) | When a system warning occurs, the relay will be energized (Close) or de-energized (Open). Warnings: • Over-current detected • Over-voltage detected • Under-voltage detected • Discharging over-temperature detected • Discharging under-temperature detected • Master over-temperature warning • Private CAN bus protocol violated • Fuse broken • System voltage outside boundaries • System measurements invalid • Battery leakage detected • Redundancy unit firmware version invalid • Redundancy unit limit detected • Service requested • Cell voltage deviation warning • Cell temperature deviation warning • Low 12V internal power supply warning • Unstable 24V external power supply warning • High battery humidity warning • Battery terminal over-temperature detected |
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| Failsafe | Close / Open (inverted) | When the system fail-safe is triggered, the relay will be energized (Close) or de-energized (Open). | |
| Current | Close / Open (inverted) | Activation current (Ampere) Deactivation current (Ampere) Activation threshold time (Minutes) Deactivation threshold time (Minutes) |
Example where Activation value is higher then Deactivation value: • Activated state: Close • Activation value: 125A • Deactivation value: 30A • Threshold times: 1 minute The output is energized (Close) when the current increases and stays above 125A for over a minute and de-energized (Open) when it decreases and stays below 30A for over a minute. Example where Activation value is lower then Deactivation value: • Activated state: Close • Activation value: -450A • Deactivation value: -50A • Threshold times: 1 minute The output is energized (Close) when the current decreases and stays below -450A for over a minute and de-energized (Open) when it increases and stays above -50A for over a minute. |
| Battery temperature | Close / Open (inverted) | Activation temperature (Celcius) Deactivation temperature (Celcius) Activation threshold time (Seconds) Deactivation threshold time (Seconds) |
Example where Activation value is higher then Deactivation value: • Activated state: Close • Activation value: 35°C • Deactivation value: 29°C • Threshold times: 60 seconds The output is energized (Close) when the battery temperature rises and stays above 35°C for over a minute and de-energized (Open) when it drops and stays below 29°C for over a minute. Example where Activation value is lower then Deactivation value: • Activated state: Close • Activation value: -5°C • Deactivation value: 10°C • Threshold times: 60 seconds The output is energized (Close) when the battery temperature drops and stays below -5°C for over a minute and de-energized (Open) when it rises and stays above 10°C for over a minute. |
| Battery cell voltage | Close / Open (inverted) | Activation voltage (Millivolt) Deactivation voltage (Millivolt) Activation threshold time (Seconds) Deactivation threshold time (Seconds) |
Example where Activation value is higher then Deactivation value: • Activated state: Close • Activation value: 3950mV • Deactivation value: 3500mV • Threshold times: 60 seconds The output is energized (Close) when the highest battery cell voltage increases and stays above 3950mV for over a minute and de-energized (Open) when it decreases and stays below 3500mV for over a minute. Example where Activation value is lower then Deactivation value: • Activated state: Close • Activation value: 3100mV • Deactivation value: 3800mV • Threshold times: 60 seconds The output is energized (Close) when the highest battery cell voltage decreases and stays below 3100mV for over a minute and de-energized (Open) when it increases and stays above 3800mV for over a minute. |
| State of charge | Close / Open (inverted) | Activation value (%) Deactivation voltage (%) Activation threshold time (Seconds) Deactivation threshold time (Seconds) |
Example where Activation value is higher then Deactivation value: • Activated state: Close • Activation value: 95% • Deactivation value: 50% • Threshold times: 60 seconds The output is energized (Close) when the state of charge increases and stays above 95% for over a minute and de-energized (Open) when it decreases and stays below 50% for over a minute. Example where Activation value is lower then Deactivation value: • Activated state: Close • Activation value: 15% • Deactivation value: 75% • Threshold times: 60 seconds The output is energized (Close) when the state of charge decreases and stays below 15% for over a minute and de-energized (Open) when it increases and stays above 75% for over a minute. |
| External Pre-charge | Close | The relay is used to control an external pre-charger. | |
| Disabled | The output is disabled and will not be controlled |
The auto shutdown functionality is implemented preventing the MG Master LV from draining the batteries. The MG Master LV will go to standby after certain conditions are met. Several parameters can be coinfigured to adjust the behavior of this function.
| Parameter | Options | Default |
|---|---|---|
| Condition | - When almost discharged -None |
Almost discharged |
| Idle threshold | This is the current presented by the percentage of the battery bank capacity | 1 % |
| Idle time | This is the time the Condition and Idle threshold must be True before going in standby | 600 minutes (10 hours) |
Example: For A 400Ah capacity system with condition set to Almost discharged, an idle threshold set to 2% and an idle time of 60 minutes, the Master LV will automatically shut down when the batteries are almost discharged and the current is below 8 A and above -8 A for 60 minutes.