Huawei SUN2000-30KTL-US User Manual page 110

SUN2000-(25KTL, 30KTL)-US
User Manual
Alarm ID Alarm
Name
106 to 111 String 1-6
Abnormal
120 to 125 String 1-6
Reverse
200 DC Bus
Voltage
Fault
Issue 09 (2019-06-30)
Alarm Causes
Severity
open-circuit voltage exceeds
the maximum value of the
inverter MPPT voltage.
 Cause ID = 3
The PV array is not
properly configured.
Excessive PV modules are
connected in series to PV
strings 5 and 6, 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 hence 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 = 10
The internal control circuit
of the SUN2000 has failed
to keep pace with changes
due to grid phase
Copyright © Huawei Technologies Co., Ltd.
Measures
operating voltage of the
SUN2000. After the PV array
configuration is corrected, the
SUN2000 alarm disappears.
 Cause ID = 3
Reduce the number of PV
modules connected in series to
PV strings 5 and 6 until the PV
string open-circuit voltage is less
than or equal to the maximum
operating voltage of the
SUN2000. After the PV array
configuration is corrected, the
SUN2000 alarm disappears.
1. Check whether the output current
of a PV string is obviously less
than the output current of other
PV strings.
2. If yes, check whether the PV
string is shielded.
3. If the PV string is clean and not
shielded, check whether the PV
modules are faulty.

Cause ID = 1
Check whether the PV string is
reversely connected to the
SUN2000. If yes, turn off the two
DC switches after the PV string
voltage drops within the safe
voltage range (lower than 60 V
DC), and then 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 = 10/11
− The SUN2000 monitors its
external working conditions in
real time and automatically
recovers to the normal
operating status after the fault
is rectified.
− If the alarm persists, contact
Huawei technical support.

Cause ID = 12/15
8 Maintenance
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