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SUN2000-(3KTL-10KTL) User Manual

This document describes the SUN2000-3KTL-M0, SUN2000-4KTL-M0, SUN2000-5KTL-M0, SUN2000-6KTL-M0, SUN2000-8KTL-M0, SUN2000-10KTL-M0, and SUN2000-12KTL-M0 in terms of their installation, electrical connections, commissioning, maintenance, and troubleshooting. BOM number: 01074467, 01074295, 01074300, 01074301, 01074302, 01074306, 01074311, 01074314, 01074315, 01074316, 01074320
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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 converting power after a fault occurs.
  • Minor: Some components are faulty but the SUN2000 can still connect to the power grid and convert power.
  • Warning: The SUN2000 output power decreases due to external factors.
Table 7-2 Common alarms and troubleshooting measures

Alarm ID

Alarm Name

Alarm Severity

Possible Cause

Troubleshooting Suggestion

2001

High String Input Voltage

Major

Excessive PV modules are connected in series in the PV array. Therefore, the open-circuit voltage exceeds the maximum input voltage of the SUN2000.

  • Cause ID 1: PV strings 1.
  • Cause ID 2: PV strings 2.

Check the number of PV modules connected in series in the PV string, and ensure that the PV string open-circuit voltage is no greater than the maximum operating voltage of the SUN2000. After you correctly configure the PV array, the inverter alarm disappears automatically.

2002

DC Arc Fault

Major

The PV string power cable arcs or is in poor contact.

Check whether the string cables arc or are in poor contact.

2011

String Reversed

Major

The PV string is reversely connected.

  • Cause ID 1: PV strings 1.
  • Cause ID 2: PV strings 2.

Check whether the PV string is reversely connected to the SUN2000. If so, wait until the solar irradiance declines at night and the PV string current drops to below 0.5 A. Then, set the DC SWITCH to the OFF position, and correct the string polarity.

2012

String Current Backfeed

Warning

Only a few PV modules are connected in series in the PV string. Therefore, the end voltage is lower than that of other PV strings.

  • Cause ID 1: PV strings 1.
  • Cause ID 2: PV strings 2.
  1. Check whether the PV modules connected in series in the PV string are enough. If not, add more modules.
  2. Check whether the PV string is shaded.
  3. Check whether the open-circuit voltage of the PV string is normal.

2031

Power grid phase wire short-circuit to PE

Major

The impedance of the output phase wire is low or short-circuited to PE.

Check the impedance of the output phase wire to PE, locate the position with lower impedance and restore that.

2032

Grid Failure

Major

  • The power grid experiences an outage.
  • The AC circuit is disconnected or the AC switch is off.
  1. Check the AC voltage.
  2. Check whether the AC circuit is disconnected or whether the AC switch is off.

2033

Grid Undervoltage

Major

The power grid voltage is below the lower threshold or the undervoltage duration exceeds the value specified by LVRT.

  1. If the alarm occurs occasionally, 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 mobile phone app, SmartLogger, or NMS to modify the grid undervoltage protection threshold with the consent of the local power operator.
  3. If the fault persists for a long time, check the connection between the AC switch and the output power cable.

2034

Grid Overvoltage

Major

The power grid voltage is beyond the upper threshold or the overvoltage duration exceeds the value specified by HVRT.

  1. If the alarm occurs occasionally, 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 mobile phone app, SmartLogger, or NMS to modify the grid overvoltage protection threshold with the consent of the local power operator.
  3. Check whether the peak voltage of the power grid is too high. If the fault persists and cannot be rectified for a long time, contact the power operator.

2035

Unbalanced Grid Voltage

Major

The difference between grid phase voltages exceeds the upper threshold.

  1. If the alarm occurs occasionally, 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.
  3. If the fault persists for a long time, check the connection between the AC switch and the output power cable.

2036

Grid Overfrequency

Major

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

  1. If the alarm occurs occasionally, 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 mobile phone app, SmartLogger, or NMS to modify the grid overfrequency protection threshold with the consent of the local power operator.

2037

Grid Underfrequency

Major

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

  1. If the alarm occurs occasionally, 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 mobile phone app, SmartLogger, or NMS to modify the grid underfrequency protection threshold with the consent of the local power operator.

2038

Unstable Grid Frequency

Major

Power grid exception: The actual grid frequency change rate does not comply with the local power grid standard.

  1. If the alarm occurs occasionally, 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 power grid frequency is within the acceptable range. If not, contact the local power operator.

2039

Output Overcurrent

Major

The power grid voltage drops dramatically or the power grid is short-circuited. As a result, the SUN2000 transient output current exceeds the upper threshold and therefore the protection is triggered.

  1. The SUN2000 detects its external working conditions in real time. After the fault is rectified, it automatically recovers.
  2. If the alarm occurs frequently and affects the power production of the PV plant, check whether the output is short-circuited. If the fault persists, contact your dealer or Huawei technical support.

2040

Output DC Component Overhigh

Major

The DC component of the SUN2000 output current exceeds the specified upper threshold.

  1. The SUN2000 detects its external working conditions in real time. After the fault is rectified, it automatically recovers.
  2. If the alarm occurs frequently, contact your dealer or Huawei technical support.

2051

Abnormal Residual Current

Major

The insulation impedance of the input side to PE decreases when the SUN2000 is operating.

  1. If the alarm occurs occasionally, the external power cable may be abnormal temporarily. The SUN2000 automatically recovers after the fault is rectified.
  2. If the alarm occurs frequently or persists, check whether the impedance of the PV string to ground is excessively low.

2061

Abnormal Grounding

Major

  • The N cable or ground cable is not connected.
  • When a PV array is grounded, the inverter output is not connected to an isolation transformer.

Power off the inverter and check the following items:

  1. Check whether the PE cable of the SUN2000 is connected properly.
  2. If the inverter is connected to the TN power grid, check whether the N cable is properly connected and whether the voltage of the N cable to ground is normal.
  3. Check whether the output is connected to an isolation transformer. If yes, set Grounding inspection to Disable through the mobile phone app, SmartLogger, or NMS.

2062

Low Insulation Resistance

Major

  • PV arrays are short-circuited with PE.
  • The ambient air of the PV array is damp and the insulation between the PV array and the ground is poor.
  1. Check the output resistance of the PV array to ground. If there is a short circuit or lack of insulation, rectify it.
  2. Check that the PE cable of the SUN2000 is correctly connected.
  3. If you are sure that the impedance is less than the default value in a cloudy or rainy environment, log in to the mobile phone app, SmartLogger, or NMS and reset the insulation impedance protection threshold.

2063

Overtemperature

Major

  • The SUN2000 is installed in a place with poor ventilation.
  • The ambient temperature is too high.
  • The SUN2000 is not working properly.
  • Check the ventilation and ambient temperature of the SUN2000 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 your dealer or Huawei technical support.

2064

Device Fault

Major

An unrecoverable fault has occurred on a circuit inside the SUN2000.

Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, contact your dealer or Huawei technical support.

2065

Upgrade Failed

Major

The upgrade does not end normally.

  1. Perform the upgrade again.
  2. If the upgrade fails several times, contact your dealer or Huawei technical support.

2066

License Expired

Minor

  • The privilege certificate has entered the grace period.
  • The privilege feature will be invalid soon.
  1. Apply for a new certificate.
  2. Load the new certificate.

61440

Monitoring Unit Faulty

Minor

  1. The flash memory is insufficient.
  2. The flash memory has bad sectors.

Turn off the AC output switch and then the DC input switch. After 5 minutes, turn on the AC output switch and then the DC input switch. If the fault persists, replace the board, If the upgrade fails several times, contact your dealer or Huawei technical support.

2067

Faulty Power Collector

Major

  • In grid connection with zero power mode, the power meter communication is interrupted.
  • In grid connection with Grid connected with zero power, the power meter communication is interrupted.
  1. Check that the power meter settings are based on the actual model.
  2. Check that the communications parameters for the power meter are the same as the SUN2000 RS485 parameter settings.
  3. Check that the power meter is powered on, and the RS485 cable is connected correctly.

2072

Transient AC Overvoltage

Major

The inverter detects that the phase voltage exceeds the transient AC overvoltage protection threshold.

  1. Check whether the grid connection 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 have obtained the consent of the local power operator, modify the overvoltage protection threshold through the mobile phone app, SmartLogger, or NMS.
  3. Check whether the peak power grid voltage exceeds the upper threshold.

2085

Built-in PID Operation Abnormal

Minor

  • Cause ID = 1

    An unrecoverable fault occurred in the internal circuit.

  • Cause ID = 2

    The output resistance of the PV array to ground is low.

  • Cause ID = 1
    1. Turn off the AC output switch and then the DC input switch. After 15 minutes, turn on the AC output switch and then the DC input switch.
    2. If the fault persists, contact the dealer or Huawei customer service center.
  • Cause ID = 2
    1. Check the output resistance of the PV array to ground. If there is a short circuit or lack of insulation, rectify it.
    2. If the fault persists, contact the dealer or Huawei customer service center.
NOTE:

Contact your dealer or Huawei technical support if the measures listed in the Troubleshooting Suggestion column have been taken but the fault persists.

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Updated: 2019-05-31

Document ID: EDOC1100059932

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