Troubleshooting - Huawei SUN2000 Series User Manual

SUN2000-(3KTL-10KTL)-M0
User Manual

7.2 Troubleshooting

Alarm severities are defined as follows:



Table 7-2 Common alarms and troubleshooting measures
Alarm ID Alarm
Name
2001 High
String
Input
Voltage
2002 DC Arc
Fault
String
2011
Reverse
Connectio
n
2012 String
Current
Backfeed
Issue 04 (2019-10-18)
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.
Alarm Possible Cause
Severity
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.

Cause ID 1 = PV1
 Cause ID 2 = PV2
Major The PV string power cable arcs
or is in poor contact.
 Cause ID 1 = PV1
 Cause ID 2 = PV2
The PV string polarity is
Major
reversed.
 Cause ID 1 = PV1

Cause ID 2 = PV2
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.
 Cause ID 1 = PV1

Cause ID 2 = PV2
Copyright © Huawei Technologies Co., Ltd.
Troubleshooting Suggestion
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.
Check that the PV string power cable
does not arc and is in good contact.
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.
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.
2. Check whether the PV string is
shaded.
3. Check whether the open-circuit
voltage of the PV string is
normal.
7 Maintenance
66