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 = 16
The voltage between the
input PV string and the
ground is abnormal, and
there is a risk of power
attenuation.
Cause ID = 3/10/11
1. The SUN2000 detects its external
working conditions in real time.
After the fault is rectified, the
SUN2000 automatically recovers.
2. If the alarm persists, contact
Huawei technical support.
Cause ID = 12/15
Turn off the AC output switch and
then the DC input switch. After 5
minutes, turn them on in the same
sequence. If the fault persists,
contact Huawei technical support.
Cause ID = 16
1. If there is no PID compensation
device in the system, set
Reactive power output at night
and PID protection at night of
the SUN2000 to Disable.
2. If there is a PID compensation
device in the system, check
whether it is faulty. If so, rectify
the fault.
3. Check whether PID
compensation direction
(Crystalline silicon PV
compensation mode) of the
SUN2000 and PV module
compensation voltage direction
of the PID module are correctly
set based on the PV module
model. If not, reset them.
4. If the alarm persists, contact
Huawei technical support.
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