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If there is any questions or doubts that are not covered by this manual, contact us.
With the following information provided, Sungrow shall diagnose and solve the problem
more easily:
• Type and serial number of the inverter and internal devices
• Manufacturer, model, and configuration of the PV arrays and upstream & downstream
combiner devices connected to the inverter
• Inverter communication solution
• Fault and brief description of the fault phenomenon
• A picture of the fault if necessary
11.3 Fault and Troubleshooting on the Inverter
The fault information of the inverter can be viewed on the home page of the LCD screen.
Specifically, refer to the "9.9 Checking Present Fault Information ".
Fault severities of the inverter are defined as follows:
• Major: The invertershuts down and stops feeding power into the grid.
• Minor: Some components are faulty, but the inverter can still feed power to the grid.
• Warning: Functions of the inverter are normal, but the output power drops due to
external factors.
The fault severity of fault names and their corresponding solutions are shown in the
following table.
Fault
name
Explanation
Fault
severity
Measures
PDP-pro/
Module
fault
The drive board
is faulty or
hardware
overcurrent
occurs.
Major
1. Check whether the AC/DC side of the
module is short-circuited.
2. Check whether the grid is normal.
3. Check whether the appearances of
modules inside the inverter are normal.
Cntr-flt
The contactor is
faulty.
Major
Disconnect the AC and DC switches of
the module, allow the module capacitors
to discharge completely, and then check
whether the appearance of the AC
contactor is normal.
Mism-Iac
The AC current is
unbalanced.
Major
Check whether the grid is normal or
whether phase loss occurs.
System Manual 11 Troubleshooting
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