Troubleshooting - Huawei SUN2000 Series User Manual

7.2 Troubleshooting

Alarm severities are defined as follows:
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Table 7-2 Common alarms and troubleshooting measures
Alarm
Alarm ID
Name
2001 High
String
Input
Voltage
DC Arc
2002
Fault
2011 String
Reversed
2012 String
Current
Backfeed
2031 Power grid
phase wire
short-circu
it to PE
Issue 02 (2019-04-30)
Major: The SUN2000 enters the shutdown mode and disconnects from the power grid to
stop converting power after a fault occurs.
Minor: Some components are faulty but the SUN2000 can still connect to the power grid
and convert power.
Warning: The SUN2000 output power decreases 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: PV strings 1.

Cause ID 2: PV strings 2.
The PV string power cable arcs
Major
or is in poor contact.
Major The PV string is reversely
connected.

Cause ID 1: PV strings 1.
 Cause ID 2: PV strings 2.
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: PV strings 1.
 Cause ID 2: PV strings 2.
Major The impedance of the output
phase wire is low or
short-circuited to PE.
Copyright © Huawei Technologies Co., Ltd.
SUN2000-(3KTL-10KTL)
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.
User Manual
Page 61 of 81