Troubleshooting - Huawei SUN2000-M0 Series User Manual

SUN2000-(5KTL, 6KTL)-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
2031 Power
grid phase
wire
short-
circuit to
PE
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
 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 is reversely
Major
connected.
 Cause ID 1 = PV1

Cause ID 2 = PV2
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
Major Cause ID = 1
The impedance of the output
phase wire is low or short-
circuited to PE.
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 PV modules
connected in series in the PV
string are enough. If not, add
more modules.
2. Check whether the PV string is
shaded.
3. Check whether the open-circuit
voltage of the PV string is
normal.
Check the impedance of the output
phase wire to PE, locate the position
with lower impedance and restore
that.
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