Huawei SUN2000-30KTL-A User Manual page 91

SUN2000-(30KTL-A, 33KTL, 40KTL)
User Manual
Alarm Alarm
ID Name
120–1 String 1–6
25 Reversed
200 Abnormal
DC Circuit
Issue 04 (2016-06-20)
Alarm Possible Cause
Severity

Cause ID Cause ID = 1
= 1:
The PV string is
Major
reversely connected.
Cause ID

Cause ID = 2
= 2:
Only a few PV modules
Warning
are connected in series to
the PV string, and
therefore the end voltage
is lower than that of
other PV strings.
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.
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8 System Maintenance
Suggestion

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.
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.
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