Huawei SUN2000-33KTL-US User Manual page 110

SUN2000-(33KTL, 36KTL, 40KTL)-US
User Manual
Alarm ID Alarm
Name
Abnormal
106–113
String 1–8
String 1–8
120–127
Reversed
200 Abnormal
DC Circuit
Issue 07 (2019-06-20)
Alarm Possible Cause
Severity
strings 5 and 6, 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.
Warning Cause ID = 1
 The PV string is shielded
from sunlight for a long
time.
 The PV string deteriorates
or is damaged.
Cause ID 
Cause ID = 1
= 1:
The PV string is reversely
Major
connected.
Cause ID
 Cause ID = 2
= 2:
Only a few PV modules are
Warning
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
SUN2000. The possible causes
are as follows:
 Cause ID = 3
The SUN2000 input is
disconnected accidentally,
or the PV string output
Copyright © Huawei Technologies Co., Ltd.
Suggestion

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.
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.

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.
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
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