SUN2000-(30KTL-A, 33KTL, 40KTL)
User Manual
8 System Maintenance
Issue 04 (2016-06-20)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
85
Alarm
ID
Alarm
Name
Alarm
Severity
Possible Cause
Suggestion
120–1
25
String 1–6
Reversed
Cause ID
= 1:
Major
Cause ID
= 2:
Warning
Cause ID = 1
The PV string is
reversely connected.
Cause ID = 2
Only a few PV modules
are connected in series to
the PV string, and
therefore the end voltage
is lower than that of
other PV strings.
Cause ID = 1
Check whether the PV string is
reversely connected to the inverter. If
yes, turn off the two DC switches after
the PV string voltage drops within the
safe voltage range (lower than 60 V
DC), and then correct the PV string
connection.
Cause ID = 2
Check whether the number of PV
modules connected in series to the
inverter is small. If yes, increase the
number.
200
Abnormal
DC Circuit
Major
Abnormal external
conditions trigger the
protection for the DC circuit
inside the inverter. The
possible causes are as
follows:
Cause ID = 3
The inverter input is
disconnected
accidentally, or the PV
string output power
changes sharply because
the PV string is shielded
from sunlight.
Cause ID = 10
The three phases of the
power grid are seriously
unbalanced, which
triggers the protection
for the internal control
circuit of the inverter.
Cause ID = 11
The power grid voltage
changes sharply and the
inverter input power fails
to discharge in a short
time, which increases the
internal voltage and
triggers overvoltage
protection.
Cause ID = 12/15
An unrecoverable fault
occurs on a circuit inside
the inverter.
Cause ID = 3/10/11
1.
The inverter detects its external
working conditions in real time. After
the fault is rectified, the inverter
automatically recovers.
2.
If the alarm occurs repeatedly, contact
Huawei technical support.
Cause ID = 12/15
Turn off the AC output switch and DC
input switch. Then turn on the AC output
switch and DC input switch after 5
minutes. If the fault persists, contact
Huawei technical support.
