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SUN2000-(50KTL, 60KTL, 65KTL)-M0 User Manual

This document describes the SUN2000-50KTL-M0, SUN2000-60KTL-M0 and SUN2000-65KTL-M0 in terms of its 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 inverter is faulty. As a result, the output power decreases or the grid-tied power generation is stopped.
  • Minor: Some components are faulty without affecting the grid-tied power generation.
  • Warning: The inverter works properly. The output power decreases or some authorization functions fail due to external factors.
Table 8-2 Common alarms and troubleshooting measures

Alarm ID

Alarm Name

Alarm Severity

Cause

Measures

2001

High String Input Voltage

Major

The PV array is incorrectly configured. Excessive PV modules are connected in series to the PV string, and hence the PV string open-circuit voltage exceeds the maximum operating voltage of the SUN2000.

  • Cause ID 1 corresponds to PV strings 1 and 2.
  • Cause ID 2 corresponds to PV strings 3 and 4.
  • Cause ID 3 corresponds to PV strings 5 and 6.
  • Cause ID 4 corresponds to PV strings 7 and 8.
  • Cause ID 5 corresponds to PV strings 9 and 10.
  • Cause ID 6 corresponds to PV strings 11 and 12.

Reduce the number of PV modules connected in series to the PV string 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 alarm stops.

2011

String Reverse Connection

Major

The PV string is reversely connected.

Cause IDs 1 to 12 respectively correspond to PV strings 1 to 12.

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.

2012

String Current Backfeed

Warning

  1. Only a few PV modules are connected in series to the PV string, and hence the end voltage is lower than that of other PV strings.
  2. The PV string is shaded.

Cause IDs 1 to 12 respectively correspond to PV strings 1 to 12.

  1. Check whether the number of PV modules connected in series to this PV string is less than the number of PV modules connected in series to the other PV strings. If yes, connect more PV modules in series to this PV string.
  2. Check the open-circuit voltage of the PV string.
  3. Check that the PV string is not shaded.

2013

Abnormal String Power

Warning

  1. The PV string has been shaded for a long time.
  2. The PV string deteriorates abnormally.

Cause IDs 1 to 12 respectively correspond to PV strings 1 to 12.

  1. Check whether the current of the abnormal PV string is lower than the current of other PV strings. If yes, check that the abnormal PV string is not shaded and the actual number of PV strings is the same as the configured number.
  2. If the abnormal PV string is clean and not shaded, check whether the PV string is damaged.

2031

Phase Wire Short-Circuited to PE

Major

Cause ID = 1

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

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

2032

Grid Loss

Major

Cause ID = 1

  1. The power grid experiences an outage.
  2. The AC circuit is disconnected or AC switch is off.
  1. The alarm disappears automatically after the power grid recovers.
  2. Check that the AC power cable is connected and that the AC switch is ON.

2033

Grid Undervoltage

Major

Cause ID = 1

The grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by LVRT.

  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 power grid voltage is within the acceptable range. If no, contact the local power operator. If yes, modify the power grid undervoltage protection threshold with the consent of the local power operator.
  3. If the fault persists for a long time, check the AC circuit breaker and AC output power cable.

2034

Grid Overvoltage

Major

Cause ID = 1

The grid voltage exceeds the higher threshold or the high voltage duration has lasted for more than the value specified by HVRT.

  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 connection voltage exceeds the upper threshold and obtained the consent of the local power operator, modify the overvoltage protection threshold.
  3. Check that the peak grid voltage does not exceed the upper threshold.

2035

Grid Voltage Imbalance

Major

Cause ID = 1

The difference between grid phase voltages exceeds the upper threshold.

  1. Check that the grid voltage is within the normal range.
  2. Check the connection of the AC output power cable. If the cable connection is proper but the alarm occurs frequently and affects the power production of the PV plant, contact the local power operator.

2036

Grid Overfrequency

Major

Cause ID = 1

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

  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, modify the power grid overfrequency protection threshold with the consent of the local power operator.

2037

Grid Underfrequency

Major

Cause ID = 1

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

  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, modify the power grid underfrequency protection threshold with the consent of the local power operator.

2038

Unstable Grid Frequency

Major

Cause ID = 1

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

  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.

2039

Output Overcurrent

Major

Cause ID = 1

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.

  1. The inverter detects its external working conditions in real time. After the fault is rectified, the inverter 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 Huawei technical support.

2040

Output DC Component Overhigh

Major

Cause ID = 1

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

  1. If the exception is caused by an external fault, the SUN2000 automatically recovers after the fault is rectified.
  2. If the alarm occurs frequently and affects the power production of the PV plant, contact Huawei technical support.

2051

Abnormal Residual Current

Major

Cause ID = 1

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

  1. If the alarm occurs accidentally, 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 that the impedance between the PV string and ground is not below the lower threshold.

2061

Abnormal Grounding

Major

Cause ID = 1

  1. The PE cable for the SUN2000 is not connected.
  2. The SUN2000 output side does not connect to an isolation transformer when the PV string output is grounded.
  1. Check that the PE cable for the SUN2000 is connected properly.
  2. If the PV string output is grounded, check that the SUN2000 output side connects to an isolation transformer.

2062

Low Insulation Resistance

Major

Cause ID = 1

  1. The PV string is short-circuited to PE.
  2. The PV string has been in a moist environment for a long time and the power cable is not well insulated to ground.
  1. Check the impedance between the PV string and the PE cable. If a short circuit occurs, rectify the fault.
  2. Check that the PE cable for 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, reset Insulation resistance protection.

2063

Cabinet Overtemperature

Major

Cause ID = 1

  1. The SUN2000 is installed in a place with poor ventilation.
  2. The ambient temperature exceeds the upper threshold.
  3. The SUN2000 is not working properly.
  1. Check the ventilation and ambient temperature at the SUN2000 installation position. If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation.
  2. If the ventilation and ambient temperature both meet requirements, contact Huawei technical support.

2064

Device Fault

Major

Cause ID = 1-15

An unrecoverable fault occurs 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 Huawei technical support.

NOTICE:

Cause ID = 1: Perform the preceding operations when the PV string current is less than 1 A.

2065

Upgrade Failed

Minor

Cause ID = 1-5

The upgrade ends abnormally.

  1. Perform an upgrade again.
  2. If the upgrade fails several times, contact your dealer.

2066

License Expired

Warning

Cause ID = 1

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

61440

Faulty Monitoring Unit

Minor

Cause ID = 1

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

Turn off the AC output switch and DC input switch, and then turn them on after 15 minutes. If the fault persists, replace the monitoring board or contact Huawei technical support.

2085

Built-in PID Operation Abnormal

Minor

Cause ID = 1/2

  1. The output resistance of PV arrays to ground is low.
  2. The system insulation resistance 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 your supplier/Huawei technical support.
  • Cause ID = 2
    1. Check the output resistance of PV arrays to ground. If there is a short circuit or lack of insulation, rectify it.
    2. If the fault persists, contact your supplier/Huawei technical support.
NOTE:

Contact Huawei technical support if all failure analysis procedures listed above are completed and the fault still exists.

Updated: 2019-10-12

Document ID: EDOC1100016052

Views: 7860

Downloads: 2267

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