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SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL) User Manual

This document describes the SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL) in terms of their installation, electrical connections, commissioning, maintenance, and troubleshooting.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Troubleshooting

Troubleshooting

Alarm severities are defined as follows:
  • Major: The SUN2000 enters the shutdown mode and disconnects from the power grid to stop generating electricity after a fault occurs.
  • Minor: Some components are faulty but the SUN2000 can still generate electricity.
  • Warning: The SUN2000 output power decreases due to external factors.
Table 8-2  Common alarms and troubleshooting measures

Alarm ID

Alarm Name

Alarm Severity

Possible Cause

Suggestion

103

High DC Input Voltage

Major

  • 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 value of the inverter MPPT voltage.

  • 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 value of the inverter MPPT voltage.

  • 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 value of the inverter MPPT voltage.

  • Cause ID = 4

    The PV array is not properly configured. Excessive PV modules are connected in series to PV strings 7 and 8, and therefore the PV string open-circuit voltage exceeds the maximum value of the inverter MPPT voltage.

  • Cause ID = 1

    Reduce the number of PV modules connected in series to PV strings 1 and 2 until the open-circuit voltage is less than or equal to the maximum inverter input voltage. 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 open-circuit voltage is less than or equal to the maximum inverter input voltage. 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 open-circuit voltage is less than or equal to the maximum inverter input voltage. After the PV array configuration is corrected, the SUN2000 alarm disappears.

  • Cause ID = 4

    Reduce the number of PV modules connected in series to PV strings 7 and 8 until the open-circuit voltage is less than or equal to the maximum inverter input voltage. After the PV array configuration is corrected, the SUN2000 alarm disappears.

106–113

Abnormal String 1–8

Warning

Cause ID = 1
  • The PV string is shielded from sunlight for a long time.
  • The PV string deteriorates or is damaged.
  1. Check whether the PV string current is obviously lower than the currents of other PV strings.
  2. If yes, check whether the PV string is shielded from sunlight.
  3. If the PV string is clean and not shielded from sunlight, check whether any PV module is faulty.

120–127

String 1–8 Reversed

Cause ID = 1: Major

Cause ID = 2: Warning

  • 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.

  • Cause ID = 1

    Check whether the PV string is reversely connected to the SUN2000. If yes, wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the two DC switches and correct the PV string connection.

  • Cause ID = 2

    Check whether the number of PV modules connected in series to the SUN2000 is small. If yes, increase the number.

200

Abnormal DC Circuit

Major

Abnormal external conditions trigger the protection for the DC circuit inside the SUN2000. The possible causes are as follows:
  • Cause ID = 3

    The SUN2000 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 SUN2000.

  • Cause ID = 11

    The grid voltage changes sharply and the SUN2000 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 SUN2000.

  • Cause ID = 16

    The voltage between the input PV string and the ground is abnormal, and there is a risk of power attenuation.

Cause ID = 3/10/11
  1. The SUN2000 detects its external working conditions in real time. After the fault is rectified, the SUN2000 automatically recovers.
  2. If the alarm persists, contact Huawei technical support.

Cause ID = 12/15

Turn off the AC output switch and then the DC input switch. After 5 minutes, turn them on in the same sequence. If the fault persists, contact Huawei technical support.

Cause ID = 16

  1. If there is no PID compensation device in the system, set Reactive power output at night and PID protection at night of the SUN2000 to Disable.
  2. If there is a PID compensation device in the system, check whether it is faulty. If so, rectify the fault.
  3. Check whether PID compensation direction (Crystalline silicon PV compensation mode) of the SUN2000 and PV module compensation voltage direction of the PID module are correctly set based on the PV module model. If not, reset them.
  4. If the alarm persists, contact Huawei technical support.

202

Abnormal Invert Circuit

Major

Abnormal external conditions trigger the protection for the inverter circuit inside the SUN2000. The possible causes are as follows:
  • Cause ID = 13

    The grid voltage drops dramatically or the power grid is short-circuited, which damages the internal voltage detection circuit in the SUN2000.

  • Cause ID = 14

    The 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.

Cause ID = 13/14/16
  1. The inverter detects its external working conditions in real time. After the fault is rectified, the SUN2000 automatically recovers.
  2. If the alarm persists, contact Huawei technical support.
Cause ID = 20
  1. Check the inverter output cable for short-circuits.
  2. If the alarm persists, contact Huawei technical support.

301

Abnormal Grid Voltage

Major

The grid voltage is beyond the acceptable range. The possible causes are as follows:
  • Cause ID = 4

    The grid voltage is below the specified lower threshold.

  • Cause ID = 16

    The grid voltage exceeds the specified upper threshold.

  • Cause ID = 19

    The grid voltage has exceeded the specified upper threshold for 10 minutes.

  • Cause ID = 26

    The grid voltage exceeds the specified upper threshold.

  • Cause ID = 28

    The three phases of the power grid differ greatly in voltage.

  • Cause ID = 29
    1. The power grid experiences an outage.
    2. The AC circuit is disconnected or AC switch is OFF.
  • Cause ID = 31/32/33

    The impedance of the output phase wire A (cause ID = 31)/B (cause ID = 32)/C (cause ID = 33) to the PE cable is low or short-circuited.

Cause ID = 4
  1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
  2. If the alarm occurs frequently, check whether the 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 grid overvoltage and undervoltage protection thresholds with the consent of the local power operator.
  3. If the fault persists for a long time, check the AC switch and AC output power cable.
Cause ID = 16/19/26
  1. Check whether the grid-tied voltage exceeds the upper threshold. If yes, contact the local power operator.
  2. 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.
  3. Check whether the peak grid voltage exceeds the upper threshold.
Cause ID = 28
  1. If the exception is caused by an external fault, the SUN2000 automatically recovers after the fault is rectified.
  2. If the alarm persists and affects the energy yield of the power station, contact the local power operator.
Cause ID = 29
  1. Check the AC voltage.
  2. Check that the AC power cable is securely connected and that the AC switch is ON.

Cause ID = 31/32/33

Check the impedance of output phase wire A (cause ID = 31)/B (cause ID = 32)/C (cause ID = 33) to the PE cable and locate the position with lower impedance and resolve the issue.

305

Abnormal Grid Frequency

Major

  • Cause ID = 2

    The actual grid frequency is higher than the standard requirement for the local power grid.

  • Cause ID = 4

    The actual grid frequency is lower than the standard requirement for the local power grid.

  • Cause ID = 5

    The actual change rate of the grid frequency does not meet the standard requirement for the local power grid.

Cause ID = 2/4
  1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
  2. If the alarm occurs frequently, check whether the 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 grid overfrequency and underfrequency protection thresholds with the consent of the local power operator.
Cause ID = 5
  1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
  2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator.

313

Low Insulation Resistance

Major

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.
  1. Check the impedance between the PV string and the PGND cable. If a short circuit occurs, rectify the fault.
  2. 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.

318

Abnormal Residual Current

Major

Cause ID = 1

The insulation resistance against the PGND cable at the input side decreases when the SUN2000 is running, which causes an excessively high residual current.

  1. If the alarm occurs accidentally, the external circuit may be abnormal temporarily. The SUN2000 automatically recovers after fault is rectified.
  2. If the alarm occurs repeatedly or persists, check whether the impedance between the PV string and the ground is excessively low.

321

Cabinet Overtemperature

Major

Cause ID = 1
  • The SUN2000 is installed in a place with poor ventilation.
  • The ambient temperature exceeds the upper threshold.
  • The internal fan works abnormally.
  1. Check the ventilation and ambient temperature of the SUN2000 installation position.
  2. If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation.
  3. If the ventilation and ambient temperature both meet requirements, contact Huawei technical support.

326

Abnormal Grounding

Major

Cause ID = 1
  • The neutral wire or PGND cable does not connect to the SUN2000.
  • The SUN2000 output side does not connect to an isolation transformer when the PV string output is grounded.
  1. Check that the neutral wire or PGND cable properly connects to the inverter.
  2. If the PV string output is grounded, check that the SUN2000 output side connects to an isolation transformer.

400

System Fault

Major

Cause ID = 1/3/21/23/27

An unrecoverable fault occurs on a circuit inside the SUN2000.

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.

410

Abnormal Auxiliary Power

Major

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.
  1. When the alarm is generated, the SUN2000 shuts down automatically. When the fault is rectified, the SUN2000 starts automatically.
  2. If the alarm persists, contact Huawei technical support.

411

AFCI Self-Check Failure

Major

Cause ID = 1/2/3

AFCI check fails.

  1. 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.
  2. Disable the AFCI function if you are sure not to use it.

412

DC Arc Fault

Major

Cause ID = 1/2/3/4

The PV string cable is in poor contact or with open circuits.

Check whether the PV string cable is in poor contact or with open circuits. If yes, reconnect the cable.

504

Software Version Unmatch

Minor

Cause ID = 1/2/3

During inverter software upgrade, the version of the software loaded is incorrect.

Check whether you have performed a software upgrade recently. If yes, upgrade the software to the correct version again.

505

Upgrade Failed

Major

Cause ID = 1

The upgrade does not end normally.

Perform the upgrade again.

506

License Expired

Warning

Cause ID = 1

  1. The license has entered its grace period.
  2. The license will expire soon.
  1. Apply for a license.
  2. Load the new license.

61440

Flash Fault

Minor

Cause ID = 1
  • The flash memory is insufficient.
  • The flash memory has bad sectors.
  1. Replace the monitoring board.
  2. If the monitoring board is built into the monitoring device, replace the monitoring device.
NOTE:

If you cannot rectify faults with the measures listed in the preceding table, contact Huawei technical support.

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Updated: 2019-08-02

Document ID: EDOC1100019925

Views: 14979

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