
8. Troubleshooting and Maintenance
WARNING
Before maintaining and commissioning inverter and its peripheral distribution unit,
switch off all the charged terminals of the inverter and wait at least 10 minutes after
the inverter is powered off,otherwise there will be a high voltage shock..
DANGER
Wrong maintenance will result in personnel injury or equipment damage!
Before performing any maintenance operations, you must follow these steps:
First, disconnect the AC circuit breaker on the grid side, and then disconnect
the DC switch.
Wait at least 10 minutes after the inverter is powered off,otherwise there will be a
high voltage shock.
Use testing equipment to make sure there no voltage or current.
8.1 Troubleshooting
NOTICE
Comply with ESD protection specifications and power distribution ESD bracelets.
Avoid unnecessary contact with the circuit board.
Touching printed circuit boards or other electrostatic sensitive components may
cause damage during the process.
If the inverter is break down, the LED indicator will turn to red.
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Three phase Grid-tied PV String Inverter User Manual Troubleshooting and Maintenance
Three phase Grid-tied PV String Inverter User Manual
Troubleshooting and Maintenance
Measures Recommended
A0-Grid over
voltage
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2.If the alarm occurs repeatedly, contact the local power station. After receiving approval
of the local power bureau, revise the electrical protection parameters setting on the
inverter through APP.
3.If the alarm persists for a long time,please confirm:
1) The AC circuit breaker does not jump frequently (the instantaneous high pressure);
2) If the line of communication is followed by the user manual, the cable impedance will
cause the power grid to rise;
3) The three-phase machine measures whether the voltage between the zero line and the
ground line exceeds 30V; More than the wiring of the grid;
If there is no problem, Pls.contact the customer service center.
A1-Grid under
voltage
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2.If the alarm occurs repeatedly, contact the local power station. After receiving approval
of the local power bureau, revise the electrical protection parameters setting on the
inverter through APP.
3.If the alarm persists for a long time,please confirm:
1) AC circuit breaker is disconnect ro not;
2) Whether the AC circuit breaker is damaged (whether the voltage in the closed state is
consistent with the voltage of the outlet);
3) The AC terminals are in good contact.
If the actual measuring voltage is within the specification range, please contact the
customer service report repair.
A2-Grid absent
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2. If the alarm occurs repeatedly, contact the local power station. After receiving
approval of the local power bureau, revise the electrical protection parameters setting on
the inverter through APP.
3.If the alarm persists for a long time,please confirm:
1) AC circuit breaker is disconnect ro not;
2) Whether the AC circuit breaker is damaged (whether the voltage in the closed state is
consistent with the voltage of the outlet);
3) The AC terminals are in good contact;
4) Whether the power supply line failure.
If exclude all possibility ,please contact the customer service report repair.
A3-Grid over
frequency
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2.If the alarm occurs repeatedly, contact the local power station. After receiving approval
of the local power bureau, revise the electrical protection parameters setting on the
A4-Grid under
frequency
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2.If the alarm occurs repeatedly, contact the local power station. After receiving approval
of the local power bureau, revise the electrical protection parameters setting on the
inverter through APP.
3.If the alarm persists for a long time,Pls.contact the customer service center.
A6-Grid abnormal
(Only for three-
phase inverter)
1.If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No
extra action is needed.
2.If the alarm occurs repeatedly,please confirm:
1) The three-phase voltage is measured, and confirm the three-phase voltage imbalance is
more than 30%, Please improve the power supply condition of the power grid company.
2) The three-phase AC circuit breaker is damaged or not (whether the voltage of the inlet
line and the outlet of the outlet is consistent).
3) The AC circuit breaker have zero line or not, and if the line is cut off, the short zero
line confirmation problem is repeated, if not again, replace 3Pole switch or the zero line
is short. If still, please contact customer service report repair.
B0-PV over
voltage
Check whether the maximum voltage of a single string of input PV modules exceeds the
MPPT voltage range. If the maximum voltage is higher than the standard voltage, modify
the number of PV module connection strings.
B1-PV insulation
abnormal
1.If the alarm occurs accidentally, the inverter can generate power, check the installation
environment is wet or not of the component and wire rope,and improve the installation
environment.
2..If the alarm occurs repeatedly, the inverter can generate electricity occasionally, check
whether the positive and negative polarity of the pv component is short circuit, and check
the component is damaged or the connection line is broken.
3.If the alarm continues, equipment cannot generate power, please contact customer
service report repair.