8.3 Troubleshooting
Alarm severities are dened 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
aecting 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 fault alarm list
ID Name Severity Cause Solution
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
PV string open-circuit
voltage exceeds the
maximum inverter
operating voltage.
● Cause ID 1: PV strings 1
and 2
● Cause ID 2: PV strings 3
and 4
● Cause ID 3: PV strings 5
and 6
● Cause ID 4: PV strings 7
and 8
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 string
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: PV strings 1
and 2
● Cause ID 2: PV strings 3
and 4
● Cause ID 3: PV strings 5
and 6
● Cause ID 4: PV strings 7
and 8
Check whether the PV string
cables arc or are in poor contact.
2003 DC arc
fault
Major The PV string power cables
arc or are in poor contact.
Cause ID 1–8: PV strings 1–
8
Check whether the PV string
cables arc or are in poor contact.
SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual 8 Maintenance
Issue 11 (2023-01-10) Copyright © Huawei Technologies Co., Ltd. 74
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