9 Troubleshooting and Maintenance User Manual
Item Method Period
Electrical connec
tion
Check whether cables are loose or fall
off.
Check whether the cable is damaged,
especially the part in contact with the
metal enclosure.
Six months to a year
9.2.3 Cleaning Air Inlet and Outlet
A significant amount of heat is generated when the inverter is working.
In order to maintain good ventilation, please check to make sure the air inlet and outlet are
not blocked.
Clean the air inlet and outlet with soft brush or vacuum cleaner if necessary.
9.2.4 Fan Maintenance
DANGER
• Power off the inverter and disconnect it from all power supplies before maintaining
fans.
• After the inverter is powered off for 5 minutes, measure the voltage and current
with professional instrument. Only when there is no voltage nor current can oper
ators who wear protective equipment operate and maintain the inverter.
• Fan maintenance must be performed by professionals.
Fans inside the inverter are used to cool the inverter during operation. If the fans do not operate
normally, the inverter may not be cooled down and inverter efficiency may decrease. Therefore,
it is necessary to clean dirty fans and replace the broken fans in a timely manner.
The operation procedure is as follows:
step 1 Stop the inverter (see 8.1 Disconnecting the Inverter).
step 2 Loosen the screw on the sealing plate of the fan module.
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