6.3 On-site Inspection (For qualied installer only)
To troubleshoot an inoperable microinverter, follow the steps in the order shown.
1
Verify the utility voltage and frequency are within ranges shown in the in appendix Technical Data
of this microinverter.
2
Check the connection to the utility grid. Verify utility power is present at the inverter in question by
removing AC, then DC power. Never disconnect the DC wires while the microinverter is producing
power. Re-connect the DC module connectors and watch for ve short LED ashes.
3
Check the AC branch circuit interconnection between all the microinverters. Verify each inverter is
energized by the utility grid as described in the previous step.
4 Make sure that any AC breaker are functioning properly and are closed.
5 Check the DC connections between the microinverter and the PV module.
6
Verify the PV module DC voltage is within the allowable range shown in appendix Technical Data of
this manual.
7 If the problem persists, please call Hoymiles customer support.
Do not try to repair the microinverter. If the troubleshooting fails, please return it to the factory for
replacement.
6.4 Routine Maintenance
1. Only authorized personnel are allowed to carry out the maintenance operations and are responsible to report any
anomalies.
2. Always use the personal protective equipment provided by the employer when carry out the maintenance operation.
3. During normal operation, check that the environmental and logistic conditions are correct. Make sure that the condi-
tions have not changed over time and that the equipment is not exposed to adverse weather conditions and has not
been covered with foreign bodies.
4. DO NOT use the equipment if any problems are found, and restore the normal conditions after the fault removed.
5. Conduct an annual inspection on various components, and clean the equipment with a vacuum cleaner or special
brushes.
Do not attempt to dismantle the Microinverter or make any internal repairs! In order to preserving
the integrity of safety and insulation, the Microinverters are not designed to allow internal repairs!
The AC output wiring harness (AC drop cable on the Microinverter) cannot be replaced. If the cord
is damaged the equipment should be scrapped.
Maintenance operations must be carried out with the equipment disconnected from the grid (power
switch open) and the photovoltaic modules obscured or isolated, unless otherwise indicated.
For cleaning, do not use rags made of lamentary material or corrosive products that may corrode
parts of the equipment or generate electrostatic charges.
Avoid temporary repairs. All repairs should be carried out using only genuine spare parts.
Each branch should provide a circuit breaker, but no need for central protection unit.
© 2020 Hoymiles Power Electronics Inc. All rights reserved.
17
Three-phase Microinverter HMT-1800/2250 Troubleshooting
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