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• If there is a string current backfeed fault, first check whether the optimizer is
offline.
• Contact the dealer if the measures listed in the “Troubleshooting Method” col-
umn have been taken but the problem persists. Contact SUNGROW if the
dealer fails to solve the problem.
9.2 Maintenance
9.2.1 Maintenance Notices
Risk of inverter damage or personal injury due to incorrect service!
• Be sure to use special insulation tools when perform high-voltage operations.
• Before maintenance, disconnect the AC circuit breaker on the grid side and
then the DC switch. If a fault that may cause personal injury or device damage
is found before maintenance, disconnect the AC circuit breaker and wait until
the night before operating the DC switch. Otherwise, a fire inside the product or
an explosion may occur, causing personal injuries.
• After the inverter is powered off for 15 minutes, measure the voltage and cur-
rent with professional instrument. Only when there is no voltage nor current
can operators who wear protective equipment operate and maintain the inverter
• Even if the inverter is shut down, it may still be hot and cause burns. Wear pro-
tective gloves before operating the inverter after it cools down.
When maintaining the product, it is strictly prohibited to open the product if there
is an odor or smoke or if the product appearance is abnormal. If there is no odor,
smoke, or obvious abnormal appearance, repair or restart the inverter according to
the alarm corrective measures. Avoid standing directly in front of the inverter dur-
ing maintenance.
To prevent misuse or accidents caused by unrelated personnel: Post prominent
warning signs or demarcate safety warning areas around the inverter to prevent
accidents caused by misuse.
9 Troubleshooting and Maintenance User Manual
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