| Alarm ID | Alarm Name | Alarm Severity | Possible Cause | Troubleshooting Suggestion |
| 2001 | High
String Input Voltage | Major | The
PV array is not properly configured. Excessive PV modules are connected in
series to the PV string, and therefore the open-circuit voltage exceeds the
maximum inverter operating voltage. | 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 inverter operating voltage. After the PV
array is correctly configured, the inverter alarm disappears. |
| | | | Cause ID 1 = PV1 | |
| | | | Cause ID 2 = PV2 | |
| 2002 | DC
Arc Fault | Major | The
PV string power cable arcs or is in poor contact. | Check that the PV string power cable
does not arc and is in good contact. |
| | | | Cause ID 1 = PV1 | |
| | | | Cause ID 2 = PV2 | |
| 2011 | String
Reverse Connection | Major | The
PV string polarity is reversed. | Check whether the PV string is
reversely connected to the SUN2000. If yes, wait until the PV string current
decreases below 0.5 A, set DC SWITCH to OFF, and adjust the PV string polarity. |
| | | | Cause ID 1 = PV1 | |
| | | | Cause ID 2 = PV2 | |
| 2012 | String
Current Backfeed | Warning | The
number of PV modules connected in series to this PV string is insufficient.
As a result, the end voltage is lower than that of other strings. | 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 connected in parallel
with this PV string. If yes, wait until the PV string current decreases below
0.5 A, set DC SWITCH to OFF, and adjust the number of PV
modules in the PV string. |
| | | | Cause ID 1 = PV1 | 2. Check whether
the PV string is shaded. |
| | | | Cause ID 2 = PV2 | 3. Check whether
the open-circuit voltage of the PV string is normal. |
| 2021 | AFCI
Self-Check Failure | Major | Cause
ID = 1, 2 | 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. |
| | | | AFCI check fails. | |
| 2031 | Phase
Wire Short-Circuited to PE | Major | Cause
ID = 1 | Check the impedance of the output phase
wire to PE, locate the position with lower impedance, and rectify the fault. |
| | | | The impedance of
the output phase wire to PE is low or the output phase wire is
short-circuited to PE. | |
| 2032 | Grid
Loss | Major | Cause
ID = 1 | 1. Check that the AC voltage is normal. |
| | | | The power grid
experiences an outage. | 2. Check that the
AC power cable is connected and that the AC switch is ON. |
| | | | The AC power cable
is disconnected or the AC circuit breaker is OFF. | |
| 2033 | Grid
Undervoltage | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | The grid voltage is
below the lower threshold or the low voltage duration has lasted for more
than the value specified by LVRT. | 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, login 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, check the connection between the AC switch and the output power
cable. |
| 2034 | Grid
Overvoltage | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | The grid voltage
exceeds the higher threshold or the high voltage duration has lasted for more
than the value specified by HVRT. | 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, log in to
the mobile app, SmartLogger, or network management system (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 grid operator. |
| 2035 | Grid
Voltage Imbalance | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | The difference
between grid phase voltages exceeds the upper threshold. | 2. If the alarm
occurs frequently, check whether the power 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 of the AC output power cables. |
| | | | | 4. If the AC output
power cables are correctly connected, but the alarm persists and affects the
energy yield of the PV plant, contact the local power operator. |
| 2036 | Grid
Overfrequency | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | Power grid
exception: The actual grid frequency is higher than the requirement of the
local power grid standard. | 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. |
| 2037 | Grid
Underfrequency | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | Power grid
exception: The actual grid frequency is lower than the requirement of the
local power grid standard. | 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 | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the power grid may be abnormal temporarily. The inverter automatically
recovers after detecting that the power grid becomes normal. |
| | | | Power grid
exception: The actual grid frequency change rate does not comply with the
local power grid standard. | 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 | 1. The inverter monitors its external
working conditions in real time. The inverter automatically recovers after
the fault is rectified. |
| | | | 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 inverter
protection is triggered. | 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 | Cause
ID = 1 | 1. The inverter monitors its external
working conditions in real time. The inverter automatically recovers after
the fault is rectified. |
| | | | The DC component in
the grid current exceeds the upper threshold. | 2. If the alarm
occurs frequently, contact your dealer or Huawei technical support. |
| 2051 | Abnormal
Residual Current | Major | Cause
ID = 1 | 1. If the alarm occurs accidentally,
the external power cable may be abnormal temporarily. The inverter
automatically recovers after the fault is rectified. |
| | | | The input-to-ground
insulation impedance has decreased during the inverter operation. | 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 | Power off the inverter (turn off the AC
output switch and DC input switch, and wait for 5 minutes), and then perform
the following operations: |
| | | | The neutral wire or
ground cable is not connected. | 1. Check that the
PE cable for the inverter is connected properly. |
| | | | The PV array is
grounded, but the inverter output does not connect to an isolation
transformer. | 2. If the inverter
is connected to the TN power grid, check whether the N cable is properly
connected and whether the voltage to ground is normal. |
| | | | | 3. Check whether
the AC output connects to an isolation transformer. If yes, after powering on
the inverter, log in to the mobile phone app, SmartLogger, or NMS and
disable Grounding inspection. |
| 2062 | Low
Insulation Resistance | Major | Cause ID = 1 | 1. Check the impedance
between the PV array output and PE, and eliminate short circuits and poor
insulation points. |
| | | | The PV array is
short-circuited to ground. | 2. Check that the
PE cable for the inverter is connected correctly. |
| | | | The PV array is in
a moist environment and the power cable is not well insulated to ground. | 3. If you are sure
that the impedance is less than the preset protection threshold in a cloudy
or rainy environment, log in to the mobile phone app, SmartLogger, or NMS and
reset the insulation impedance protection threshold. |
| 2063 | Cabinet
Overtemperature | Minor | Cause
ID = 1 | Check the ventilation and ambient
temperature at the inverter installation position. |
| | | | The inverter is
installed in a place with poor ventilation. | If the ventilation
is poor or the ambient temperature exceeds the upper threshold, improve the
ventilation and heat dissipation. |
| | | | The ambient
temperature exceeds the upper threshold. | If the ventilation
and ambient temperature both meet requirements, contact your dealer or Huawei
technical support. |
| | | | The inverter is not
working properly. | |
| 2064 | Device
Fault | Major | Cause
ID = 1–12 | 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. |
| | | | An unrecoverable
fault has occurred on a circuit inside the inverter. | |
| 2065 | Upgrade
Failed or Version Mismatch | Minor | Cause
ID = 1, 2 and 4 | 1. Upgrade again. |
| | | | The upgrade ends
abnormally. | 2. If the upgrade
fails several times, contact your dealer or Huawei technical support. |
| | | | | |
| | | | | |
| | | | Upgrade the
inverter again if it is stuck in initialization state without generating any
alarms and cannot be restored to the normal state during the upgrade when the
PV inputs are disconnected and reconnected next time. | |
| | | | | |
| 2066 | License
Expired | Warning | Cause
ID = 1 | 1. Apply for a new certificate. |
| | | | The privilege
certificate has entered the grace period. | 2. Load the new
certificate. |
| | | | The privilege
feature will be invalid soon. | |
| 61440 | Faulty
Monitoring Unit | Minor | Cause
ID = 1 | Turn off the AC output switch and DC
input switch, and then turn them on after 5 minutes. If the fault persists,
replace the monitoring board or contact your dealer Huawei technical support. |
| | | | The flash memory is
insufficient. | |
| | | | The flash memory
has bad sectors. | |
| 2067 | Faulty
Power Collector | Major | Cause
ID = 1 | 1. Check that the preset power meter
model is the same as the actual model. |
| | | | Power meter
disconnection. | 2. Check that the
preset communications parameters for the power meter are the same as the
actual configurations. |
| | | | | 3. Check that the
power meter is powered on and the RS485 communications cable is connected. |
| 2072 | Transient
AC Overvoltage | Major | Cause
ID = 1 | 1. Check whether the grid connection
voltage exceeds the upper threshold. If yes, contact the local power
operator. |
| | | | The inverter
detects that the phase voltage exceeds the transient AC overvoltage
protection threshold. | 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. |
