Troubleshooting - Huawei SUN2000 User Manual

SUN2000 Smart PV Optimizer
User Manual

4.4 Troubleshooting

Table 4-1 Common alarms and troubleshooting measures
Alarm Name
Input
overvoltage
Overtempera
ture
Internal
hardware
fault
Output
backfeed
Abnormal
output
voltage
Upgrade
failed
Issue 01 (2021-10-30)
Cause
Optimizer input
overvoltage occurred.
The optimizer internal
temperature is too high.
An internal fault
occurred in an optimizer.
Optimizer output
backfeed occurred.
The optimizer output
voltage is abnormal.
The optimizer software
upgrade failed.
Copyright © Huawei Technologies Co., Ltd.
4 System Maintenance
Suggestions
Check whether the open-circuit
voltage of the PV module connected
to the optimizer exceeds 80 V.
1. Check the ventilation and ambient
temperature at the optimizer
installation position. If the
ventilation is poor or the ambient
temperature exceeds the upper
threshold, improve the ventilation
and heat dissipation.
2. If the ventilation and ambient
temperature are normal, contact
the installation contractor.
Contact the installation contractor.
1. Check whether PV modules are
shaded when PV strings are
connected in parallel.
2. If the fault persists, contact the
installation contractor.
1. When the sunlight is normal,
perform optimizer search again.
2. Check whether the optimizer
output extension cable is correctly
prepared (positive connector at
one end and negative connector
at the other).
3. Check whether the PV string is
correctly connected to the inverter
or whether there is a breakpoint
in the PV string.
4. If the fault persists, contact the
installation contractor.
1. When the sunlight is normal,
perform the optimizer upgrade
again.
2. If the fault persists, contact the
installation contractor.
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