Huawei SUN2000-33KTL-A, User Manual, Page: 97 / 117

SUN2000-(33KTL-A, 36KTL, 42KTL)
User Manual
8 Maintenance
Issue 07 (2018-05-04) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
91
Alarm
ID Alarm
Name Alarm
Severity Possible Cause Suggestion
and therefore the PV string
open-circuit voltage exceeds
the maximum value of the
inverter MPPT voltage.
 Cause ID = 4
The PV array is not properly
configured. Excessive PV
modules are connected in
series to PV strings 7 and 8,
and therefore the PV string
open-circuit voltage exceeds
the maximum value of the
inverter MPPT voltage.
maximum inverter input voltage.
After the PV array configuration is
corrected, the SUN2000 alarm
disappears.
 Cause ID = 4
Reduce the number of PV modules
connected in series to PV strings 7
and 8 until the open-circuit voltage
is less than or equal to the
maximum inverter input voltage.
After the PV array configuration is
corrected, the SUN2000 alarm
disappears.
106–1
13 Abnormal
String 1–8
Warning Cause ID = 1
 The PV string is shielded
from sunlight for a long time.
 The PV string deteriorates or
is damaged.
1. Check whether the PV string
current is obviously lower than the
currents of other PV strings.
2. If yes, check whether the PV string
is shielded from sunlight.
3. If the PV string is clean and not
shielded from sunlight, check
whether any PV module is faulty.
120–1
27 String 1–8
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
SUN2000. If yes, wait until the
solar irradiance declines at night
and the PV string current reduces
to below 0.5 A. Then, turn off the
two DC switches and correct the
PV string connection.
 Cause ID = 2
Check whether the number of PV
modules connected in series to the
SUN2000 is small. If yes, increase
the number.
200 Abnormal
DC Circuit Major 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
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 DC
input switch. Then turn on the AC
output switch and DC input switch
after 5 minutes. If the fault persists,