Huawei SUN2000-2KTL-L0 - Page 74

SUN2000-(2KTL-5KTL)-L0
User Manual
7 System Maintenance
Issue 02 (2019-07-04)
Copyright © Huawei Technologies Co., Ltd.
68
Alarm
ID
Alarm
Name
Alarm
Severity
Possible Cause
Suggestion
2012
String Current
Backfeed
Warning
Only a few PV modules are
connected in series in the
PV string. Therefore, the
end voltage is lower than
that of other PV strings.
The following is the
mapping between PV
strings and alarm cause IDs:

Cause ID = 1: string 1

Cause ID = 2: string 2
1. Check whether the number of PV
modules connected in series to
this PV string is less than the
number of PV modules
connected in series to the other
PV strings connected in parallel
with this PV string. If yes, wait
until the PV string current drops
below 0.5 A, set DC SWITCH
to OFF, and adjust the number of
PV modules in the PV string.
2. Check whether the PV string is
shaded.
3. Check whether the open-circuit
voltage of the PV string is
normal.
2032
Grid Failure
Major
Cause ID = 1

The power grid
experiences an outage.

The AC circuit is
disconnected or AC
switch is off.
1. Check the AC voltage.
2. Check that the AC power cable is
connected and that the AC switch
is ON.
2033
Grid
Undervoltage
Major
Cause ID = 1
The grid voltage is below
the lower threshold or the
low voltage duration has
lasted for more than the
value specified by LVRT.
1. If the alarm occurs accidentally,
the power grid may be abnormal
temporarily. The SUN2000
automatically recovers after
detecting that the power grid
becomes normal.
2. If the alarm occurs frequently,
check whether the grid voltage is
within the acceptable range. If
no, contact the local power
operator. If yes, modify the
power grid undervoltage
protection thresholds with the
consent of the local power
operator.
3. If the fault persists for a long
time, check the connection
between the AC switch and the
output power cable.