Huawei SUN2000L User Manual page 134

SUN2000L-(2KTL-5KTL)
User Manual
Alarm
Alarm ID
Name
2011 String
Reversed
2032 Grid
Failure
2033 Grid
Undervolt
age
Issue 02 (2017-12-12)
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.
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8 System Maintenance
Suggestion
Check whether the PV string is
reversely connected to the
SUN2000L. If yes, 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 no,
contact the local power operator.
If yes, modify the power grid
overvoltage and 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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