Huawei SUN2000-42KTL User Manual page 94

SUN2000-(36KTL,42KTL)
User Manual
Alarm Alarm
ID Name
305 Abnormal
Grid Freq.
313 Low
Insulation
Res.
318 Abn.
Residual
Curr.
Issue Draft A (2016-05-30)
Alarm
Possible Cause
Severity
Major  Cause ID = 2
The actual power grid
frequency is higher than
the standard requirement
for the local power grid.
 Cause ID = 4
The actual power grid
frequency is lower than
the standard requirement
for the local power grid.
 Cause ID = 5
The actual change rate of
the power grid frequency
does not meet the
standard requirement for
the local power grid.
Major  A short circuit occurs
between the PV string
and the PGND cable.

The PV string is
installed in a moist
environment for a long
time.
Major The insulation resistance
against the PGND cable at
the input side decreases
when the inverter is
running, which causes an
excessively high residual
current.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Suggestion
Cause ID = 2/4
1. If the alarm occurs accidentally, the
power grid may be abnormal
temporarily. The inverter automatically
recovers after detecting that the power
grid becomes normal.
2. If the alarm occurs frequently, check
whether the power grid frequency is
within the acceptable range. If no,
contact the local power operator. If yes,
log in to the SUN2000 APP,
SmartLogger, or the NetEco to modify
the power grid overfrequency and
underfrequency protection thresholds
with the consent of the local power
operator.
Cause ID = 5
1. If the alarm occurs accidentally, the
power grid may be abnormal
temporarily. The inverter automatically
recovers after detecting that the power
grid becomes normal.
2. If the alarm occurs frequently, check
whether the power grid frequency is
within the acceptable range. If no,
contact the local power operator.
1. Check the impedance between the PV
string and the PGND cable. If a short
circuit occurs, rectify the fault.
2. If you are sure that the impedance is
less than the default value in a cloudy
or rainy environment, log in to the
SUN2000 APP, SmartLogger, or
NetEco and set Insulation resistance
protection.
1. If the alarm occurs accidentally, the
external circuit may be abnormal
temporarily. The inverter automatically
recovers after fault is rectified.
2. If the alarm occurs repeatedly or
persists, check whether the impedance
between the PV string and the ground is
excessively low.
8 Maintenance
88