● Major: The SUN2000 enters the shutdown mode or functions abnormally
after a fault occurs.
● Minor: Some components are faulty but the SUN2000 can still connect to the
power grid and generate power.
● Warning: The SUN2000 functions normally, but its output power decreases
due to external factors.
Table 8-2 Common alarms and troubleshooting measures
Alarm
ID
Alarm Name Alarm
Severity
Possible Causes Troubleshooting
2001 High String
Input Voltage
Major The PV array is not properly
congured. Excessive PV
modules are connected in
series to the PV string, and
therefore the open-circuit
voltage exceeds the
maximum SUN2000
operating voltage.
Cause ID = 1, 2
● 1: The PV1 input voltage
is high.
● 2: The PV2 input voltage
is high.
Check the serial connection
conguration of the PV
string and ensure that the
PV string open-circuit
voltage is not greater than
the maximum operating
voltage of the SUN2000.
After the PV array
conguration is corrected,
the alarm disappears.
2002 DC Arc Fault Major The PV string power cables
arc or are in poor contact.
Cause ID = 1, 2
● 1: PV1 DC arc fault
● 2: PV2 DC arc fault
Check whether the string
cables arc or are in poor
contact.
2011 String Reversed Major The PV string is reversely
connected.
Cause ID = 1, 2
● 1: PV1 is reversely
connected.
● 2: PV2 is reversely
connected.
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.
2021 AFCI Check
Failure
Major The AFCI check fails.
Cause ID = 1, 2
● 1: The AFCI check circuit
is abnormal.
● 2: The AFCI circuit is
faulty.
Turn o 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.
SUN2000-(2KTL-6KTL)-L1
User Manual 8 System Maintenance
Issue 04 (2021-04-01) Copyright © Huawei Technologies Co., Ltd. 83
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