Huawei SUN2000-2KTL-L0 User Manual page 69

SUN2000-(2KTL-5KTL)-L0
User Manual
Alarm ID Alarm Name
2038 Unstable Grid
Frequency
Output
2039
Overcurrent
2040 Output DC
Component
Overhigh
Abnormal
2051
Residual Current
Abnormal
2061
Grounding
Issue 01 (2018-08-30)
Alarm Possible Cause
Severity
Major Cause ID = 1
Power grid exception:
The actual grid
frequency change rate
does not comply with
the local power grid
standard.
Major Cause ID = 1
The grid voltage drops
dramatically or the
power grid is
short-circuited. As a
result, the inverter
transient output current
exceeds the upper
threshold and therefore
the inverter protection is
triggered.
Major Cause ID = 1
The DC component of
the SUN2000 output
current exceeds the
specified upper
threshold.
Major Cause ID = 1
The insulation
impedance of the input
side to PE decreases
when the SUN2000 is
operating.
Major Cause ID = 1
 The protective
earthing (PE) cable
for the SUN2000 is
not connected.
 The voltage between
the SUN2000 neutral
wire and ground
exceeds the upper
threshold.
Copyright © Huawei Technologies Co., Ltd.
7 System Maintenance
Suggestion
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 frequency
is within the acceptable range. If
no, contact the local power
operator.
1. The SUN2000 monitors its
external working conditions in
real time. The SUN2000
automatically recovers after the
fault is rectified.
2. If the alarm occurs frequently and
affects the power production of
the PV plant, check whether the
output is short-circuited. If the
fault persists, contact your dealer.
1. The SUN2000 monitors its
external working conditions in
real time. The SUN2000
automatically recovers after the
fault is rectified.
2. If the alarm occurs frequently,
contact your dealer.
1. If the alarm occurs accidentally,
the external power cable may be
abnormal temporarily. The
SUN2000 automatically recovers
after the fault is rectified.
2. If the alarm occurs frequently or
persists, check that the impedance
between the PV string and ground
is not below the lower threshold.
1. Check that the PE cable for the
SUN2000 is connected properly.
2. If the SUN2000 is connected to
the TN power grid, check
whether the voltage of the neutral
wire to ground is normal.
3. Check whether the output is
connected to an isolation
transformer. If so, set Grounding
inspection to Disable.
63