System Maintenance; Troubleshooting - Huawei SUN2000-375W-USP0 User Manual

SUN2000-375W-USP0 Smart PV Optimizer
User Manual

3.1 Troubleshooting

Table 3-1 Common alarms and troubleshooting measures
Alarm Name
Input overvoltage
Overtemperature
Output short circuit
Internal hardware
fault
Issue 04 (2019-07-05)
3
Possible Cause
The PV module output
voltage exceeds the
maximum input voltage
of the SUN2000P.
The ambient
temperature exceeds the
upper threshold or the
SUN2000P is not
installed as required.
A short circuit occurs
on the output of the
SUN2000P.
The SUN2000P is not
properly installed or is
faulty.
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System Maintenance

Troubleshooting Suggestion
1. Check whether the open-circuit
voltage of the PV modules connected
to the SUN2000P exceeds 80 V.
2. Check whether the PV modules are
connected in series.
1. Check the ventilation and ambient
temperature at the SUN2000P
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.
1. Check whether the inverter works
properly. If not, rectify the fault first.
2. Check that the output cable of the
SUN2000P is connected correctly.
3. Power off the system. Disconnect
cables on the input and output sides of
the SUN2000P after 5 minutes.
Reconnect them after 1 minute and
then power on the system. If the fault
persists, contact the installation
contractor.
Power off the system. Disconnect cables
on the input and output sides of the
SUN2000P after 5 minutes. Reconnect
them after 1 minute and then power on
the system. If the fault persists, contact
the installation contractor.
3 System Maintenance
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