Maintenance
82
ESS Inverter User Manual
8.2
Inverter Troubleshooting
When the inverter has an exception, its basic common warning and exception handling methods are
shown below.
Code
Alarm Information
Suggestions
A0
Grid over voltage
1.
If the alarm occurs occasionally, possibly the power grid
voltage is abnormal for a short time, and no action is required.
2.
If the alarm occurs repeatedly, contact the local power
station. After receiving approval of the local power bureau,
revise the electrical protection parameters settings on the
inverter through the App.
3.
If the alarm persists for along time, check whether the AC
circuit breaker /AC terminals is disconnected or not, or if the
grid has a power outage.
A1
Grid under voltage
A3
Grid over frequency
A4
Grid under frequency
A2
Grid absent
Wait till power is restored.
B0
PV over voltage
Check whether the maximum voltage of a single string of input PV mod
is greater than the allowable voltage. If the maximum voltage is higher
than the standard voltage, modify the number of pv module connection
strings.
B1
PV insulation abnormal
1.
Check the insulation resistance against the ground for the PV
strings. If a short circuit has occurred, rectify the fault.
2.
If the insulation resistance against the ground is less than the
default value in a rainy environment, set insulation resistance
protection on the App.
B2
Leakage current abnormal
1.
If the alarm occurs occasionally, the inverter can be automatically
recovered to the normal operating status after the fault is rectified.
2.
If the alarm occurs repeatedly, contact your dealer for
technical support.
B4
PV under voltage
1.
If the alarm occurs occasionally, possibly the external circuits are
abnormal accidentally. The inverter automatically recovers to the norma
operating status after the fault is rectified.
2.
If the alarm occurs repeatedly or last a long time, check
whether the insulation resistance against the ground of PV
strings is too low.
C0
Internal power supply
abnormal
1.
If the alarm occurs occasionally, the inverter can be automatically
restored, no action required.
2.
If the alarm occurs repeatedly, pls. contact the customer service cente