103
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High DC Input Voltage
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Major
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- Cause ID = 1
The PV array is not properly configured. Excessive PV modules are connected in series to PV strings 1 and 2, and therefore the PV string open-circuit voltage exceeds the maximum operating voltage of the SUN2000.
- Cause ID = 2
The PV array is not properly configured. Excessive PV modules are connected in series to PV strings 3 and 4, and therefore the PV string open-circuit voltage exceeds the maximum operating voltage of the SUN2000.
- Cause ID = 3
The PV array is not properly configured. Excessive PV modules are connected in series to PV strings 5 and 6, and therefore the PV string open-circuit voltage exceeds the maximum operating voltage of the SUN2000.
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- Cause ID = 1
Reduce the number of PV modules connected in series to PV strings 1 and 2 until the PV string open-circuit voltage is less than or equal to the maximum operating voltage of the SUN2000. After the PV array configuration is corrected, the SUN2000 alarm disappears.
- Cause ID = 2
Reduce the number of PV modules connected in series to PV strings 3 and 4 until the PV string open-circuit voltage is less than or equal to the maximum operating voltage of the SUN2000. After the PV array configuration is corrected, the SUN2000 alarm disappears.
- Cause ID = 3
Reduce the number of PV modules connected in series to PV strings 5 and 6 until the PV string open-circuit voltage is less than or equal to the maximum operating voltage of the SUN2000. After the PV array configuration is corrected, the SUN2000 alarm disappears.
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106–111
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Abnormal String 1–6
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Warning
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Cause ID = 1 - The PV string is shielded from sunlight for a long time.
- The PV string deteriorates or is damaged.
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- Check whether the PV string current is obviously lower than the currents of other PV strings.
- If yes, check whether the PV string is shielded from sunlight.
- If the PV string is clean and not shielded from sunlight, check whether any PV module is faulty.
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120–125
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String 1–6 Reversed
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Cause ID = 1: Major
Cause ID = 2: Warning
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- Cause ID = 1
The PV string is reversely connected.
- Cause ID = 2
Only a few PV modules are connected in series to the PV string, and therefore the end voltage is lower than that of other PV strings.
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- Cause ID = 1
Check whether the PV string is reversely connected to the inverter. If yes, turn off the two DC switches after the PV string voltage drops within the safe voltage range (lower than 60 V DC), and then correct the PV string connection.
- Cause ID = 2
Check whether the number of PV modules connected in series to the inverter is small. If yes, increase the number.
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200
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Abnormal DC Circuit
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Major
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Abnormal external conditions trigger the protection for the DC circuit inside the inverter. The possible causes are as follows: - Cause ID = 3
The inverter input is disconnected accidentally, or the PV string output power changes sharply because the PV string is shielded from sunlight.
- Cause ID = 10
The three phases of the power grid are seriously unbalanced, which triggers the protection for the internal control circuit of the inverter.
- Cause ID = 11
The power grid voltage changes sharply and the inverter input power fails to discharge in a short time, which increases the internal voltage and triggers overvoltage protection.
- Cause ID = 12/15
An unrecoverable fault occurs on a circuit inside the inverter.
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Cause ID = 3/10/11 - The inverter detects its external working conditions in real time. After the fault is rectified, the inverter automatically recovers.
- If the alarm occurs repeatedly, contact Huawei technical support.
Cause ID = 12/15
Turn off the AC output switch and DC input switch. Then turn on the AC output switch and DC input switch after 5 minutes. If the fault persists, contact Huawei technical support.
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202
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Abnormal Invert Circuit
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Major
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Abnormal external conditions trigger the protection for the inverter circuit inside the inverter. The possible causes are as follows: - Cause ID = 13
The power grid voltage drops dramatically or the power grid is short-circuited, which damages the internal voltage detection circuit in the inverter.
- Cause ID = 14
The power grid voltage drops dramatically or the power grid is short-circuited. As a result, the inverter transient output current exceeds the upper threshold and therefore the inverter protection is triggered.
- Cause ID = 16
The DC current in the power grid exceeds the upper threshold.
- Cause ID = 20
The inverter output is short-circuited. As a result, the output current surges to a value above the upper limit, and the inverter protection is triggered.
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Cause ID = 13/14/16 - The inverter detects its external working conditions in real time. After the fault is rectified, the inverter automatically recovers.
- If the alarm occurs repeatedly, contact Huawei technical support.
Cause ID = 20 - Check the inverter output cable for short-circuits.
- If the alarm occurs repeatedly, contact Huawei technical support.
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301
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Abnormal Grid Voltage
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Major
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The power grid voltage is beyond the acceptable range. The possible causes are as follows: - Cause ID = 4
The power grid voltage is below the specified lower threshold.
- Cause ID = 16
The power grid voltage exceeds the specified upper threshold.
- Cause ID = 19
The power grid voltage has exceeded the specified upper threshold for 10 minutes.
- Cause ID = 26
The power grid voltage exceeds the specified upper threshold.
- Cause ID = 28
The three phases of the power grid differ greatly in voltage.
- Cause ID = 29
- The power grid experiences an outage.
- The AC circuit is disconnected or AC circuit breaker is off.
- Cause ID = 31–33
The impedance of the output phase wire A/B/C to the PE is low or short-circuited.
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Cause ID = 4 - If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
- If the alarm occurs frequently, check whether the power grid voltage is within the acceptable range. If no, contact the local power operator. If yes, log in to the SUN2000 APP, SmartLogger, or NMS to modify the power grid overvoltage and undervoltage protection thresholds with the consent of the local power operator.
- If the fault persists for a long time, check the AC circuit breaker and AC output power cable.
Cause ID = 16/19/26 - Check whether the grid-tied voltage exceeds the upper threshold. If yes, contact the local power operator.
- If you have confirmed that the grid-tied voltage exceeds the upper threshold and obtained the consent of the local power operator, modify the overvoltage and undervoltage protection thresholds.
- Check whether the peak power grid voltage exceeds the upper threshold.
Cause ID = 28 - If the exception is caused by an external fault, the inverter automatically recovers after the fault is rectified.
- If the alarm persists and affects the energy yield of the power station, contact the local power operator.
Cause ID = 29 - Check the AC voltage.
- Check that the AC power cable is securely connected and that the circuit breaker is ON.
Cause ID = 31–33
Check the impedance of output phase wire A/B/C to the PE and locate the position with lower impedance and resolve the issue.
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305
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Abnormal Grid Frequency
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Major
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- Cause ID = 2
The actual power grid frequency is higher than the standard requirement for the local power grid.
- Cause ID = 4
The actual power grid frequency is lower than the standard requirement for the local power grid.
- Cause ID = 5
The actual change rate of the power grid frequency does not meet the standard requirement for the local power grid.
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Cause ID = 2/4 - If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
- If the alarm occurs frequently, check whether the power grid frequency is within the acceptable range. If no, contact the local power operator. If yes, log in to the SUN2000 APP, SmartLogger, or NMS to modify the power grid overfrequency and underfrequency protection thresholds with the consent of the local power operator.
Cause ID = 5 - If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
- If the alarm occurs frequently, check whether the power grid frequency is within the acceptable range. If no, contact the local power operator.
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313
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Low Insulation Resistance
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Major
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Cause ID = 1 - A short circuit occurs between the PV string and the PGND cable.
- The PV string is installed in a moist environment for a long time.
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- Check the impedance between the PV string and the PGND cable. If a short circuit occurs, rectify the fault.
- If you are sure that the impedance is less than the default value in a cloudy or rainy environment, log in to the SUN2000 APP, SmartLogger, or NMS and set Insulation resistance protection.
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318
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Abnormal Residual Current
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Major
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Cause ID = 1
The insulation resistance against the PGND cable at the input side decreases when the inverter is running, which causes an excessively high residual current.
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- If the alarm occurs accidentally, the external circuit may be abnormal temporarily. The inverter automatically recovers after fault is rectified.
- If the alarm occurs repeatedly or persists, check whether the impedance between the PV string and the ground is excessively low.
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321
|
Cabinet Overtemperature
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Major
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Cause ID = 1 - The inverter is installed in a place with poor ventilation.
- The ambient temperature exceeds the upper threshold.
- The internal fan works abnormally.
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- Check the ventilation and ambient temperature of the inverter installation position.
- If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation.
- If the ventilation and ambient temperature both meet requirements, contact Huawei technical support.
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322
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Abnormal SPI Communication
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Major
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Cause ID = 1
An unrecoverable fault occurs on a circuit inside the inverter.
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Turn off the AC output switch and DC input switch. Then turn on the AC output switch and DC input switch after 5 minutes. If the fault persists, contact Huawei technical support.
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326
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Abnormal Grounding
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Major
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Cause ID = 1
The neutral wire or PGND cable does not connect to the inverter.
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Check that the neutral wire or PGND cable properly connects to the inverter.
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400
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System Fault
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Major
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Cause ID = 1/3/21/23/27
An unrecoverable fault occurs on a circuit inside the inverter.
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Turn off the AC output switch and DC input switch. Then turn on the AC output switch and DC input switch after 5 minutes. If the fault persists, contact Huawei technical support.
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410
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Abnormal Auxiliary Power
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Major
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Cause ID = 4
The sampling control board has an abnormal voltage, which may be caused by the following: - The internal power chip of the sampling control board is faulty.
- The detection circuit becomes faulty.
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- When the alarm is generated, the inverter shuts down automatically. When the fault is rectified, the inverter starts automatically.
- If the alarm occurs repeatedly, contact Huawei technical support.
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504
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Software Version Unmatch
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Minor
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Cause ID = 1/2/3
During inverter software upgrade, the version of the software loaded is incorrect.
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Check whether you have performed a software upgrade recently. If yes, upgrade the software to the correct version again.
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505
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Upgrade Failed
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Major
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Cause ID = 1
The upgrade does not end normally.
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Perform the upgrade again.
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61440
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Flash Fault
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Minor
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Cause ID = 1 - The flash memory is insufficient.
- The flash memory has bad sectors.
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- Replace the monitoring board.
- If the monitoring board is built into the monitoring device, replace the monitoring device.
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