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
Overtemperatu
re
Internal
hardware fault
Output
backfeed
Abnormal
output voltage
Issue 03 (2022-09-20)
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.
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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.
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