Huawei SUN2000-28KTL User Manual page 118

SUN2000 (8KTL-28KTL)
User Manual
Alarms range in severity according to the following definitions:



Table 8-2
Table 8-2 Troubleshooting
Alarm ID Name
103 DC Over
Voltage
106 to 111 String 1-6
Abnormal
Issue 12 (2019-06-30)
Major: The inverter enters the shutdown mode and disconnects from the power grid to
stop generating electricity after a fault occurs.
Minor: Some components are faulty but the inverter can still generate electricity.
Warning: The inverter output power decreases due to external factors.
describes the common fault alarms of the SUN2000 and troubleshooting measures.
Severity Causes

Major Cause ID = 1
The PV array is not
properly configured.
Excessive PV modules are
connected in series to PV
strings 1 and 2, and
therefore the PV string
open-circuit voltage
exceeds the maximum
value of the inverter MPPT
voltage.
 Cause ID = 2
The PV array is not
properly configured.
Excessive PV modules are
connected in series to PV
strings 3 and 4, and
therefore the PV string
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
 PV strings have been
shielded for a long time.
 PV strings have
deteriorated.
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Measures

Cause ID = 1
Reduce the number of PV
modules connected in series to
PV strings 1 and 2 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.

Cause ID = 2
Reduce the number of PV
modules connected in series to
PV strings 3 and 4 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.

Cause ID = 3
Reduce the number of PV
modules connected in series to
PV strings 5 and 6 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 output current
of a PV string is obviously less
than the output current of other
PV strings.
2. If so, check whether the PV
string is shielded.
3. If the PV string is clean of
8 Maintenance
111