Abnormal external conditions
trigger the protection for the
DC circuit inside the
SUN2000. The possible causes
are as follows:
Cause ID = 3
The SUN2000 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 SUN2000.
Cause ID = 11
The grid voltage changes
sharply and the SUN2000
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 SUN2000.
Cause ID = 3/10/11
1. The inverter detects its external working
conditions in real time. After the fault is
rectified, the SUN2000 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.
NOTE
Cause ID = 12: Perform the preceding operations
when the PV string current is less than 1 A.
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