Huawei SUN2000L User Manual page 70

SUN2000L-(2KTL-5KTL)
User Manual
Alarm Alarm Name
ID
2011 String
Reversed
2032 Grid Failure
2033 Grid
Undervoltage
Issue 06 (2020-03-19)
Alarm Possible Cause
Severity
Major The PV string is reversely
connected.
Major Cause ID = 1
 The power grid
experiences an outage.
 The AC circuit is
disconnected or AC
switch is off.
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.
Copyright © Huawei Technologies Co., Ltd.
7 System Maintenance
Suggestion
Check whether the PV string is
reversely connected to the
SUN2000L. If so, wait until the
solar irradiance declines at night
and the PV string current reduces
to below 0.5 A. Then, turn off the
DC switch and correct the PV
string polarity.
The following is the mapping
between PV strings and alarm
cause IDs:

Cause ID 1: string 1
 Cause ID 2: string 2
1. Check the AC voltage.
2. Check that the AC power cable
is connected and that the AC
switch is ON.
1. If the alarm occurs
accidentally, the power grid
may be abnormal temporarily.
The SUN2000L 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 not, contact the local power
operator. If so, 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.
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