Huawei SUN2000 Series User Manual page 64

SUN2000-(12KTL-25KTL)-M5 Series
User Manual
●
Table 8-2 Common alarms and troubleshooting measures
Alarm Alarm
ID Name
2001 High
string
input
voltage
2003 DC arc
fault
2011 String
reverse
connectio
n
2012 String
current
backfeed
Issue 01 (2022-06-15)
Warning: The inverter works properly. The output power decreases or some
authorization functions fail due to external factors.
Alarm Possible Causes
Severity
Major The PV array is not
properly
configured.
Excessive PV
modules are
connected in series
to the PV string,
and therefore the
PV string open-
circuit voltage
exceeds the
maximum inverter
operating voltage.
● Cause ID 1: PV
strings 1 and 2
● Cause ID 2: PV
strings 3 and 4
Major The PV string
power cables arc or
are in poor contact.
Cause ID 1–4: PV
strings 1–4
Major The PV string
polarity is reversed.
Cause ID 1–4: PV
strings 1–4
Warning The number of PV
modules connected
in series to the PV
string is
insufficient. As a
result, the terminal
voltage is lower
than that of other
strings.
Cause ID 1–4: PV
strings 1–4
Copyright © Huawei Digital Power Technologies Co., Ltd.
Troubleshooting
Reduce the number of PV modules
connected in series to the PV string until
the PV string open-circuit voltage is less
than or equal to the maximum inverter
operating voltage. After the PV string
configuration is corrected, the alarm
disappears.
Check whether the PV string cables arc
or are in poor contact.
Check whether the PV string is reversely
connected to the inverter. If yes, wait
until the solar irradiance declines at
night and the PV string current drops to
below 0.5 A. Then, turn off the DC
switch and correct the PV string
connection.
1. Check whether the number of PV
modules connected in series to the
PV string is less than that of other PV
strings. If yes, wait until the PV string
current drops below 0.5 A, turn off all
DC switches, and adjust the number
of PV modules in the PV string.
2. Check whether the open-circuit
voltage of the PV string is abnormal.
3. Check whether the PV string is
shaded.
8 Maintenance
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