Maintenance
ESS Inverter User Manual
85
D2
Battery over voltage
1.
If the alarm occurs occasionally, the inverter can be automatically
recovered and no action is required.
2.
Check that the battery overvoltage protection value is improperly set.
3.
The battery is abnormal.
4.
If exclude the above, the alarm continues to occur, please contact the
customer service center.
D3
Battery under voltage
1.
If the alarm occurs occasionally, the inverter can be automatically
recovered and no action is required.
2.
Check the communication line connection between BMS and inverter
(lithium battery).
3.
The battery is empty or the battery voltage is lower than the SOC cut-
off voltage.
4.
The battery undervoltage protection value is improperly set.
5.
The battery is abnormal.
6.
If exclude the above, the alarm continues to occur, please contact the
customer service center.
D4
Battery discharger over
current
1.
Check whether the battery parameters are correctly set.
2.
Battery undervoltage.
3.
Check whether a separate battery is loaded and the discharge current
exceeds the battery specifications.
4.
The battery is abnormal.
5.
If exclude the above, the alarm continues to occur, please contact the
customer service center.
D5
Battery over temperature
1.
If the alarm occurs repeatedly, please check whether the installation
site is in direct sunlight and whether the ambient temperature is too high
(such as in a closed room).
2.
If the battery is abnormal, replace it with a new one.
3.
If exclude the above, the alarm continues to occur, please contact the
customer service center.
D6
Battery under temperature
D7
BACKUP output voltage
abnormal
1.
Check whether the BACKUP voltage and frequency Settings are
within the specified range.
2.
Check whether the BACKUP port is overloaded.
3.
When not connected to the power grid, check whether BACKUP
output is normal.
4.
If exclude the above, the alarm continues to occur, please contact the
customer service center.
D8
Communication error
(Inverter-BMS)
1.
Check whether the battery is disconnected.
2.
Check whether the battery is well connected with the inverter.
3.
Confirm that the battery is compatible with the inverter. It is
recommended to use CAN communication.
4.
Check whether the communication cable or port between the battery
and the inverter is faulty.
5.
If exclude the above, the alarm continues to occur, please contact the
customer service center.