Troubleshooting - Huawei SUN2000-3KTL-M0 User Manual

SUN2000-(3KTL-12KTL)-M0
User Manual

7.2 Troubleshooting

Alarm severities are defined as follows:
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Table 7-2 Common alarms and troubleshooting measures
Alar Alarm Name
m ID
2001 High String Input
Voltage
2002 DC Arc Fault
2011 String Reversed
2012 String Current
Backfeed
2031 Power grid phase
wire short-circuit
to PE
Issue 01 (2018-12-30)
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.
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Major The PV string power cable
arcs or is in poor contact.
Major The PV string is reversely
connected.
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
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.


Major The impedance of the output
phase wire is low or
short-circuited to PE.
Copyright © Huawei Technologies Co., Ltd.
Cause ID 1: PV strings 1.
Cause ID 2: PV strings 2.
Cause ID 1: PV strings 1.
Cause ID 2: PV strings 2.
Cause ID 1: PV strings 1.
Cause ID 2: PV strings 2.
7 Maintenance
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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