Huawei SUN2000-175KTL-H0 User Manual page 80

SUN2000-(175KTL-H0, 185KTL-INH0, 185KTL-H1)
User Manual
Table 8-1 Common alarms and troubleshooting measures
Alarm Alarm
ID Name
2001 High
String
Input
Voltage
2011 String
Reverse
Connecti
on
2012 String
Current
Backfeed
2013 Abnorma
l String
Power
Issue 02 (2019-06-05)
Alarm Cause
Severit
y
Major The PV array is not properly
configured. Excessive PV modules are
connected in series to a PV string, and
therefore the PV string open-circuit
voltage exceeds the maximum
operating voltage of the inverter.
 Cause ID 1: PV strings 1 and 2

Cause ID 2: PV strings 3 and 4
 Cause ID 3: PV strings 5 and 6

Cause ID 4: PV strings 7 and 8
 Cause ID 5: PV strings 9 and 10

Cause ID 6: PV strings 11 and 12
 Cause ID 7: PV strings 13 and 14

Cause ID 8: PV strings 15 and 16
 Cause ID 9: PV strings 17 and 18
Major The PV string is reversely connected.
Cause ID 1–18: PV strings 1–18
1. Only a few PV modules are
Warning
connected in series in the PV string.
Therefore, the end voltage is lower
than that of other PV strings.
2. The PV string is shaded.
Cause ID 1–18: PV strings 1–18
1. The PV string is shaded from
Warning
sunlight for a long time.
2. The PV string has aged abnormally.
Cause ID 1–18: PV strings 1–18
Copyright © Huawei Technologies Co., Ltd.
8 Maintenance
Troubleshooting Suggestions
Reduce the number of PV
modules connected in series in the
PV string until the PV string
open-circuit voltage is not greater
than the maximum operating
voltage of the inverter. After the
PV array configuration is
corrected, the alarm disappears.
Check whether the PV string is
reversely connected to the
inverter. If it is, wait until the
solar irradiance declines at night
and the PV string current drops to
below 0.5 A. Then, turn off the
three DC switches and correct the
PV string connection.
1. Check whether the PV
modules connected in series to
the inverter are enough. If not,
add more modules.
2. Check whether the open-circuit
voltage of the PV string is
normal.
3. Check whether the PV string is
shaded.
1. Check whether the current of
the abnormal PV string is
lower than that of other PV
strings. If it is, check whether
the abnormal PV string is
shaded and the actual number
of PV strings is the same as the
configured number.
2. If the abnormal PV string is
clean and not shaded, check
whether the PV string is
damaged.
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