Troubleshooting - Huawei SUN2000-8KTL-M0 User Manual

SUN2000-(12KTL, 15KTL, 17KTL, 20KTL)-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
Reversed
2012 String
Current
Backfeed
Issue 03 (2019-07-19)
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 Excessive PV modules are
connected in series in the PV
array. Therefore, the
open-circuit voltage exceeds
the maximum input voltage of
the SUN2000.
Cause ID 1 = PV1 and PV2
Cause ID 2 = PV3 and PV4
Major The PV string power cable arcs
or is in poor contact.
Cause ID 1 = PV1 and PV2
Cause ID 2 = PV3 and PV4
The PV string is reversely
Major
connected.
Cause ID 1 = PV1
Cause ID 2 = PV2
Cause ID 3 = PV3
Cause ID 4 = PV4
Warning Only a few PV modules are
connected in series in the PV
string. Therefore, the end
voltage is lower than that of
other PV strings.
Cause ID 1 = PV1
Cause ID 2 = PV2
Cause ID 3 = PV3
Cause ID 4 = PV4
Copyright © Huawei Technologies Co., Ltd.
Troubleshooting Suggestion
Check the number of PV modules
connected in series in the PV string,
and ensure that the PV string
open-circuit voltage is no greater
than the maximum operating voltage
of the SUN2000. After you correctly
configure the PV array, the inverter
alarm disappears automatically.
Check whether the string cables arc
or are in poor contact.
Check whether the PV string is
reversely connected to the SUN2000.
If so, wait until the solar irradiance
declines at night and the PV string
current drops to below 0.5 A. Then,
set the DC SWITCH to the OFF
position, and correct the 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 drops 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
63