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AND Internal bus or external bus voltage < topping charge voltage of the battery -225V for 50ms AND Internal bus or external bus voltage < topping charge voltage of the battery -65V for 500ms AND Internal bus or external bus voltage < topping charge voltage of the battery -25V for 5s”|Warning ‘DC bus undervoltage'， the DC module is turned off， triggering DC fault record， and automatically clear after the fault is recovered.|”AC startup mode， the Warning disappears automatically after the AC module is turned on， and the Warning is continuously displayed in the shutdown state; DC startup mode， the actual battery voltage is much lower than the topping charge and float charge voltage setting; The AC load power is much larger than the DC module power in the off-grid mode|

ANDThe difference between 3 times of single-phase inductance current and total current > 50A for 10s ANDThe difference between the single-phase inductance current and the average value of the three-phase inductance current > 50A for 10s”|Warning‘DC module current asymmetric'，the DC module is turned off， triggering DC fault record， and need to power off or manually clear the fault|”Set DC current <50A to run，and observe whether the DC three-phase inductor current flows in the DC details;Single-phase inductive current sampling problem; Single-phase IGBT open circuit|

ANDInternal DC or external DC voltage in battery mode> maximum topping charge voltage +68V for 100ms ANDInternal DC or external DC voltage in battery mode> maximum topping charge voltage +8V for 357ms ANDInternal DC or external DC voltage in PV mode > maximum topping charge voltage +118V for 100ms ANDInternal DC or external DC voltage in PV mode > maximum topping charge voltage +58V for 357ms ANDInternal DC or external DC voltage in DC source mode> maximum topping charge voltage +60V for 100ms AND dc source mode internal dc or external dc voltage > maximum charging voltage for 357ms”|Warning ‘DC battery overvoltage'， the DC module is turned off， triggering DC fault record， and automatically clear after the fault is recovered.|”BMS control battery disconnected during charging; The actual battery voltage is higher than the topping charge and float charge voltage setting; The DC voltage has a large fluctuation in the DC source mode; PV voltage is too high in PV mode|

ANDThe internal DC or external DC voltage in battery mode < Battery EOD voltage -150V for 100ms ANDThe internal DC or external DC voltage in PV mode < Battery EOD voltage -50V for 357ms ANDThe internal DC or external DC voltage in PV mode < Battery EOD voltage -200V for 100ms ANDThe internal DC or external DC voltage in DC source mode < Setting voltage -150V for 357ms ANDThe internal DC or external DC voltagein DC source mode < Setting voltage -300V for 100ms”|Warning ‘DC battery undervoltage'， the DC module is turned off， triggering DC fault record， and automatically clear after the fault is recovered.|“The actual battery voltage is lower than the battery EOD voltage setting; The DC load is too heavy or the output voltage fluctuates greatly in the DC source mode. PV low voltage in PV mode|

AND Battery current >170A or battery current > current limit +25A or power >80K for 2s AND Battery current >160A or battery current > current limit +15A or power >73K for 20s AND Battery current > current limit +5A for 60s”|Warning‘DC battery overcurrent'， the DC module is turned off， triggering DC fault record， and the fault is automatically cleared after 3 minutes.|”AC overloaded under the off-grid; DC load is too heavy or DC output is shorted in DC source mode; IGBT short circuit|

Whether the battery is not connected| 10|24V power fault|The auxiliary power supply 24V appears overvoltage or undervoltage， hardware signal.|Warning ‘DC 24V power fault'，the DC module is turned off， and automatically clear after the fault is recovered.|Replace the module; 11|15V power fault|The auxiliary power supply 15V appears overvoltage or undervoltage， hardware signal.|Warning ‘DC 15V power fault'，the DC module is turned off， and automatically clear after the fault is recovered.|Replace the module; 12|Emergency stop|Emergency stop button action， hardware signal|Warning‘DC emergency stop'，the DC module is turned off， triggering DC fault record， and need to power off or manually clear the fault.|”Manually operate the emergency stop button; Check if the emergency stop button signal is disturbed and is triggered; If there is only a single DC Warning emergency shutdown， it may be the internal hardware problem of the DC| 13|Module over temperature|IGBT temperature > 85 degrees for 1s.|Warning‘DC module over temperature'，the DC module is turned off， triggering DC fault record，and automatically cleared after the temperature drops for 5 minutes.|“The ambient temperature is too high; The rack air duct is blocked and the ventilation is not good; Module fan problem， rack fan problem| 14|Module over temperature trip|IGBT temperature > 90 degrees for 500ms.|Warning‘DC module over temperature'，the DC module is turned off， triggering DC fault record，the DC breaker is tripped，and automatically cleared after the temperature drops for 100s.|”The ambient temperature is too high; The rack air duct is blocked and the ventilation is not good; Module fan problem， rack fan problem| 15|Fan fault|When controlling the fan to start up， the fan can't work normally， and the processing fan's fault hardware signal|Warning‘DC fan fault'，the DC module is turned off， and need to power off to clear the fault.|“Block rotation of module fans or non-rotation of individual fans; Module fan speed is abnormal| 16|Battery relay open circuit|When the main relay on the DC side is closed， the internal and external DC voltage difference >20V for 200ms.|Warning‘DC battery relay open circuit'，the DC module is turned off， triggering DC fault record， and need to power off to clear the fault.|”The DC side main relay is open circuit damaged; The internal and external DC voltages are not calibrated well， and the voltage difference is too large， resulting in false Warnings; There is a large fluctuation in the DC side voltage， resulting in false positives| 17|Battery relay short circuit|Both the main relay and the soft start relay on the DC side are disconnected， and when the internal and external DC voltage >90V， the internal and external DC voltage difference <15V for 80s|Warning‘DC battery relay short circuit'， the DC module is turned off， triggering DC fault record， and need to power off to clear the fault.|“Adhesion of main relay on dc side; Adhesion of soft-start relay on dc side| 18|Bus relay open circuit|When the main relay on the BUS side is closed， the internal and external BUS voltage difference >30V for 200ms.|Warning‘DC bus relay open circuit'，the DC module is turned off， triggering DC fault record， and need to power off to clear the fault.|”The bus side main relay is open circuit damaged; The internal and external bus voltages are not well calibrated， and the voltage difference is too large， resulting in false Warnings; There is a large fluctuation in the voltage on the bus side， resulting in false Warnings| 19|Bus relay short circuit|Both the main relay and the soft start relay on the BUS side are disconnected， and when the internal and external BUS voltage >120V， the internal and external DC voltage difference <15V for 80s|Warning‘DC bus relay short circuit'，the DC module is turned off， triggering DC fault record， and need to power off to clear the fault.|“Adhesion of main relay on bus side; Adhesion of soft start relay on bus side| 20|Calibration parameters abnormal|There are analog quantities that are not calibrated|The Warning‘DC calibration parameters abnormal'does not affect the power on， and can be cleared after power-on after calibration.|Eliminate after calibrating analog quantity; 21|Monitoring setup fault|Monitoring failed to complete the power-on initialization setting parameters|Warning‘DC monitoring setup fault'，the DC module is turned off， and the fault is cleared after the monitoring completes the initialization parameter setting.|”CANA communication channel is seriously disturbed; CANA bus matching resistance is not equal to 60Ω; The DC does not match the monitoring software version| 22|Battery soft start fault|“The internal and external DC voltage difference is inconsistent for 120s when starting from the DC side， ANDThe bus voltage cannot reach the target value for 90s when starting from the DC side. ANDThe internal and external DC voltage difference is inconsistent for 120s when starting from the BUS side”|Warning‘DC battery soft start fault'，the DC module is turned off，triggering DC fault record， and need to power off to clear the fault.|“Dc side soft start relay open circuit damage; The soft start resistance of dc side is damaged; IGBT open circuit or auxiliary power supply problems| 23|Bus soft start fault|”The internal and external DC voltage difference is inconsistent for 120s when starting from the BUS side ANDBus soft start relay is closed when starting from the DC side， the external bus voltage <120V for 3s“|Warning‘DC bus soft start fault'，the DC module is turned off，triggering DC fault record， and need to power off to clear the fault.|”Open circuit damage of soft start relay on bus side; Soft start resistance on bus side is damaged| 24|CANA communication fault|Unable to communicate with monitor successfully， unable to receive monitor life frame for 10s|Warning‘DC CANA communication fault'，the DC module is turned off， and it is automatically cleared after successful communication with the monitor.|“CANA communication channel is seriously disturbed; CANA bus matching resistance is not equal to 60Ω; The DC does not match the monitoring software version| 25|CANB communication fault|The number of CANA online is not equal to the number of CANB online for 8s.|Warning‘DC CANB communication fault'，the DC module is turned off， and it is automatically cleared after successful communication with other modules.|”CANB communication channel is seriously disturbed; CANB bus matching resistance is not equal to 60Ω; The DC does not match the monitoring software version| 26|U2 communication fault 1|CANA cannot communicate with U2 board for 1min|Warning‘DC U2 communication fault 1' does not affect the booting， and it is automatically cleared after successful communication with U2 board.|“CANA communication channel is seriously disturbed; CANA bus matching resistance is not equal to 60Ω; The DC does not match the monitoring software version; U2 board has no burning program or U2CANA damage| 27|DSP version fault|Error reading Bootloader version|Warning‘DC DSP version fault'， the DC module is turned off， and the fault is cleared after re-burning the program.|”Bootloader burning error; Bootloader and DC software version do not match| 28|CPLD version fault|Error reading CPLD version|Warning‘DC CPLD version fault'， the DC module is turned off， and the fault is cleared after re-burning the program.|“CPLD burning error; CPLD and DC software version do not match| 29|Subsystem conflict fault|”If the float charge voltage setting is higher than the topping charge voltage， the fault will occur ANDIf the topping charge voltage setting is higher than the allowable range of the model，the fault will occurANDIn the photovoltaic bus mode， if the DC access type is set to non-battery， the fault will occur.“|Warning‘DC subsystem conflict fault'，the DC module is turned off， and the fault is cleared after the setting is correct.|”The topping charge and float charge voltage settings are incorrect; The microgrid type setting does not match the DC access type| 30|Microgrid photovoltaic energy is low|When the actual voltage of the battery branch < the battery EOD voltage +5V or 20V (the grid-tied is separated from the off-grid)， the battery branch will shutdown and give an Warning after the photovoltaic enters the dormant state.|Warning‘DC photovoltaic battery low energy'， the DC module is turned off， triggering DC fault record， and the fault is automatically cleared after the PV wakes up.|“Check whether the actual battery voltage is too close to the EOD voltage; Whether the pv is not on| 31|Microgrid battery has low energy|When the actual voltage of the battery branch <the battery EOD voltage +5V or 20V (the grid-tied is separated from the off-grid)， the DC source branch will shutdown and give an Warning.|Warning‘DC micro-grid battery energy is low'， the DC module is turned off， triggering DC fault record， and the battery voltage rises to EOD+(Vtopping charge-Veod)/2 or more after the battery branch is running， the fault is automatically cleared.|”Check whether the actual battery voltage is too close to the EOD voltage; The battery should be charged at low voltage and no discharge is allowed| 32|Module duplicate fault|Within the same frame， the DC module has the same number|Warning‘DC module duplicate fault'， the DC module is turned off， and the fault is cleared after the duplicate is corrected and then re-powered.|Check whether the DC module has duplicate numbers in the same frame;