Huawei SUN2000-15KTL-50KTL-M3 Series User Manual page 37

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
ID Name
frequency
2039 Output
overcurre
nt
2040 Output
DC
compone
nt
overhigh
2051 Abnormal
residual
current
2061 Abnormal
grounding
Issue 01 (2021-04-05)
Severity Cause
actual change rate of the power
grid frequency does not meet
the requirements for the local
power grid code.
Major Cause ID = 1
The power grid voltage drops
dramatically or the power grid
is short-circuited. As a result,
the inverter transient output
current exceeds the upper
threshold, and protection is
triggered.
Major Cause ID = 1
The DC component of the
inverter output current exceeds
the upper threshold.
Major Cause ID = 1
The insulation impedance of
the input side to PE decreases
when the inverter is operating.
Major Cause ID = 1
 The neutral wire or PE
cable of the inverter is not
connected.
 The output mode set for the
inverter is inconsistent with
the cable connection mode.
Copyright © Huawei Technologies Co., Ltd.
Solution
temporarily. The inverter
automatically recovers after
detecting that the power grid
becomes normal.
2. If the alarm persists, check
whether the power grid frequency
is within the acceptable range. If
not, contact the local power
operator.
1. The inverter monitors its external
operating conditions in real time
and automatically recovers after
the fault is rectified.
2. If the alarm persists and affects
the energy yield of the PV plant,
check whether the output is
short-circuited. If the fault cannot
be rectified, contact your dealer
or Huawei technical support.
1. The inverter monitors its external
operating conditions in real time
and automatically recovers after
the fault is rectified.
2. If the alarm persists and affects
the energy yield of the PV plant,
contact your dealer or Huawei
technical support.
1. If the alarm occurs accidentally,
the external power cable may be
abnormal temporarily. The
inverter automatically recovers
after the fault is rectified.
2. If the alarm persists or lasts a
long time, check whether the
impedance between the PV string
and ground is too low.
Power off the inverter (turn off the
AC output switch and DC input
switch, and wait for a period of time.
For details about the wait time, see
the description on the device safety
warning label), and then perform the
following operations:
1. Check whether the PE cable for
the inverter is connected properly.
2. If the inverter is connected to a
TN power grid, check whether
the neutral wire is properly
connected and whether the
voltage of the neutral wire to
9 Maintenance
100