Huawei SUN2000-33KTL-A, User Manual, Page: 96 / 117

SUN2000-(33KTL-A, 36KTL, 42KTL)
User Manual
8 Maintenance
Issue 07 (2018-05-04) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
90
Item Check Method Maintenance Interval
 Check that the idle COM, USB, and
AC OUTPUT ports are locked by
waterproof caps. months to a year.
Grounding
reliability Check that ground cables are securely
connected. The first inspection is
half a year after the
initial commissioning.
From then on, perform
the inspection once six
months to a year.
8.2 Troubleshooting
Alarm severities are defined as follows:

Major: The SUN2000 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 SUN2000 can still generate electricity.

Warning: The SUN2000 output power decreases due to external factors.
Table 8-2 Common alarms and troubleshooting measures
Alarm
ID Alarm
Name Alarm
Severity Possible Cause Suggestion
103 High DC
Input
Voltage 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,
 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