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SUN2000-(100KTL, 110KTL, 125KTL) Series User Manual

This document describes the SUN2000-125KTL-M0,SUN2000-110KTL-M0,SUN2000-100KTL-M0,SUN2000-100KTL-M1 and SUN2000-100KTL-INM0 in terms of its installation, electrical connections, commissioning, maintenance, and troubleshooting. BOM number: 01074693, 01074694, 01074695, 01074695-001 and 01074695-002.

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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 solar 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 solar 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

Possible Causes

Suggestions

2001

High String Input Voltage

Major

  • Cause ID = 1: PV1 and PV2
  • Cause ID = 2: PV3 and PV4
  • Cause ID = 3: PV5 and PV6
  • Cause ID = 4: PV7 and PV8
  • Cause ID = 5: PV9 and PV10
  • Cause ID = 6: PV11 and PV12
  • Cause ID = 7: PV13 and PV14
  • Cause ID = 8: PV15 and PV16
  • Cause ID = 9: PV17 and PV18
  • Cause ID = 10: PV19 and PV20

The PV array is not properly configured. Excessive PV modules are connected in series to a PV string, and therefore the PV string open-circuit voltage exceeds the maximum operating voltage of the solar inverter.

Reduce the number of PV modules connected in series in the PV string until the PV string open-circuit voltage is not greater than the maximum operating voltage of the solar inverter. After the PV array configuration is corrected, the alarm disappears.

2011

String Reverse Connection

Major

Cause ID = 1–20: PV1–PV20

The PV string is reversely connected.

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

2012

String Current Backfeed

Warning

Cause ID = 1–20: PV1–PV20

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

  1. Check whether the number of PV modules connected in series in the PV string is less than that in other PV strings connected in parallel. If yes, wait until the solar irradiance declines at night and the PV string current drops below 0.5 A. Then, turn off the DC switches and add more PV modules.
  2. Check whether the PV string is shaded.
  3. Check whether the open-circuit voltage of the PV string is normal.

2014

High Input String Voltage to Ground

Major

Cause ID = 1

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

  1. If no PID compensation device exists in the system, disable the PID protection function at night. Note: If the PID protection function is disabled but reactive power compensation at night is enabled, PV modules may attenuate.
  2. If there is a PID compensation device in the system, check whether it is faulty. If yes, rectify the fault.
  3. Check whether the settings of compensation direction for the solar inverter and the PID device are consistent. If not, set them to be consistent based on the PV module model. (Note: If the PV– is set to positive offset, the voltage between the solar inverter PV– and the ground should be greater than 0 V to clear the alarms; if the PV+ is set to negative offset, the voltage between the solar inverter PV+ and the ground should be less than 0 V to clear the alarms.)
  4. If the alarm persists, contact Huawei technical support.

2015

PV String Loss

Warning

Cause ID = 1–20

This alarm is generated when the PV string status is abnormal due to the following conditions: a single PV string is lost; both 2-in-1 PV strings are lost; one of the 2-in-1 PV strings is lost.

  1. Check whether the solar inverter terminals are properly connected.
  2. Check whether the PV string terminals are properly connected.
  3. If a 2-in-1 terminal is used, check whether it is normal.

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 the AC switch is off.
  1. Check the AC voltage.
  2. Check whether the AC circuit is disconnected or the AC switch is off.

2033

Grid Undervoltage

Major

Cause ID = 1

The grid voltage is below the lower threshold or the undervoltage duration exceeds the time that triggers low voltage ride-through (LVRT).

  1. If the alarm occurs occasionally, the power grid may be abnormal temporarily. The solar inverter 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 not, contact the local power operator. If yes, log in to the mobile app, SmartLogger, or network management system (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 AC circuit breaker and AC output power cable.

2034

Grid Overvoltage

Major

Cause ID = 1

The grid voltage exceeds the upper threshold or the overvoltage duration exceeds the time that triggers high voltage ride-through (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 have obtained the consent of the local power operator, modify the overvoltage protection threshold.
  3. Check whether the peak grid voltage exceeds the upper threshold.

2035

Grid Volt. 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 that the AC output power cable is correctly connected. If the AC output power cable is correctly connected, yet the alarm persists and affects the energy yield of the PV plant, contact the local power operator.

2036

Grid Overfrequency

Major

Cause ID = 1

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 solar inverter 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. If yes, log in to the mobile phone app, SmartLogger, or NMS to 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 occasionally, the power grid may be abnormal temporarily. The solar inverter 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. If yes, log in to the mobile phone app, SmartLogger, or NMS to 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 occasionally, the power grid may be abnormal temporarily. The solar inverter 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 not, 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 solar inverter transient output current exceeds the upper threshold and therefore the solar inverter protection is triggered.

  1. The solar inverter detects its external working conditions in real time. After the fault is rectified, the solar inverter automatically recovers.
  2. If the alarm occurs frequently and affects the energy yield of the PV plant, check whether the output is short-circuited. If the fault cannot be rectified, contact your dealer or Huawei technical support.

2040

Output DC Component Overhigh

Major

Cause ID = 1

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

  1. If the exception is caused by an external fault, the solar inverter automatically recovers after the fault is rectified.
  2. If the alarm occurs frequently, contact your dealer or Huawei technical support.

2051

Abnormal Residual Current

Major

Cause ID = 1

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

  1. If the alarm occurs occasionally, the external circuit may be abnormal temporarily. The solar inverter automatically recovers after the fault is rectified.
  2. If the alarm occurs frequently or persists, check whether the impedance between the PV string and the ground is too low.

2061

Abnormal Grounding

Major

Cause ID = 1

The neutral wire or PE wire is not connected when Output mode of the solar inverter is set to Three-phase four-wire.

  1. Check that the neutral wire and PE wire of the solar inverter are properly connected.
  2. Check whether the voltage between the neutral wire and the ground exceeds 30 V. If yes, set Output mode to Three-phase three-wire on the mobile app, SmartLogger, or NMS after obtaining the consent of the local power operator.

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 circuit is not well insulated to ground.
  1. Check the impedance of the PV string to PE. If a short circuit occurs or the insulation is insufficient, rectify it.
  2. Check that the PE cable of the solar inverter 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

Minor

Cause ID = 1

  1. The solar inverter is installed in a place with poor ventilation.
  2. The ambient temperature is too high.
  3. The solar inverter is not working properly.
  1. Check the ventilation and whether the ambient temperature of the solar inverter exceeds the upper limit. If the ventilation is poor or the ambient temperature is too high, improve ventilation.
  2. If both the ventilation and ambient temperature meet requirements yet the fault persists, contact your dealer or Huawei technical support.

2064

Device Fault

Major

Cause ID = 1–15

An unrecoverable fault has occurred on a circuit inside the solar inverter.

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.

NOTICE:

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

2065

Upgrade Failed or Software Version Unmatch

Minor

Cause ID = 1–4

The upgrade does not complete normally.

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

2066

License Expired

Warning

Cause ID = 1

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

2067

Faulty Power Collector

Major

Cause ID = 1

The power meter is disconnected.

  1. Check whether the configured power meter model is the same as the actual model.
  2. Check whether the communications parameters of the power meter are the same as the RS485 configurations of the solar inverter.
  3. Check whether the power meter is powered on and whether the RS485 communications cable is connected.

2086

External Fan Abnormal

Major

Cause ID = 1–3: FAN 1–3

The external fan is short-circuited, the power supply is insufficient, or the air channel is blocked.

  1. Shut down the fan, turn off the DC switch, check whether the fan blades are damaged, and clear the foreign matter around the fan.
  2. Reinstall the fan, turn on the DC switch, and wait for the solar inverter to start. If the fault persists after 15 minutes, replace the external fan.

2087

Internal Fan Abnormal

Major

Cause ID = 1

The internal fan is short-circuited, the power supply is insufficient, or the fan is damaged.

Turn off the AC output switch and then the DC input switch. Turn them on after 5 minutes and wait for the solar inverter to connect to the power grid. If the fault persists, contact your dealer or Huawei technical support.

2088

Abnormal DC Protection Unit

Major

Cause ID = 1

The fuse is not in position or is blown.

Cause ID = 2

The two relays on the breaking board are open-circuited.

Turn off the AC output switch and then the DC input switch. Turn them on after 5 minutes and wait for the solar inverter to connect to the power grid. If the fault persists, contact your dealer or Huawei technical support.

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 your dealer or Huawei technical support.

If you cannot rectify faults with the measures listed in the Suggestions column, contact your dealer or Huawei technical support.

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Updated: 2019-12-25

Document ID: EDOC1100087908

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