Common Fault Alarm List - Huawei SUN2000-15KTL-50KTL-M3 Series User Manual

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
Table 9-2 Common fault alarm list
ID Name
High DC
103
input
voltage
106~113 Abnormal
string 1 to
Abnormal
string 8
120~127 String 1
reversed
to String
8
reversed
200 Abnormal
DC
circuit
Issue 01 (2021-04-05)
Severity Cause
The PV array is not properly
Major
configured. Excessive PV
modules are connected in
series to the PV string, and
therefore the PV string
open-circuit voltage exceeds
the maximum inverter
operating voltage.
 Cause ID 1: PV strings 1
and 2
 Cause ID 2: PV strings 3
and 4
 Cause ID 3: PV strings 5
and 6
 Cause ID 4: PV strings 7
and 8
Warning Cause ID = 1
 The PV string is shaded for
a long time.
 The PV string is aged.

Cause  Cause ID = 1
ID =
The PV string polarity is
1:
reversed.
Major
 Cause ID = 2
 Cause
The number of PV modules
ID =
connected in series to the
2:
PV string is insufficient. As
Warni
a result, the terminal
ng
voltage is lower than that of
other strings.
Major Abnormal external conditions
trigger the protection for the
DC circuit inside the inverter.
The possible causes are as
follows:

Cause ID = 3
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Solution
Reduce the number of PV modules
connected in series to the PV string
until the PV string open-circuit
voltage is less than or equal to the
maximum inverter operating voltage.
After the PV string configuration is
corrected, the alarm disappears.
1. Check whether the PV string
current is obviously lower than
the currents of other PV strings.
2. If the PV string current is
obviously low, check whether the
PV string is shaded.
3. If the PV string surface is clean
and not shaded, check whether
PV modules are damaged.
 Cause ID = 1
Check whether the PV string is
reversely connected to the
inverter. If yes, wait until the
solar irradiance declines at night
and the PV string current drops 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 PV string is less than that of
other PV strings. If yes, adjust the
number of PV modules.
 Cause ID = 3/10/11
1. The inverter monitors its
external operating conditions
in real time and automatically
recovers after the fault is
rectified.
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