（5）Fan is working in good condition
8.2 Periodic Preservation and Maintenance
8.2.1 Periodic Maintenance
Cut off the power when inverter is maintained thermally, check after the main circuit power
indicator light is off. The checking content is shown in Table 8-1.
T
able 8-1 Periodic inspections
Checking item Checking content Troubleshooting
Screws of control
terminals and main
circuit terminals
The screws are loose or not If loose, tighten them with
screw driver
Heat sink Whether there is dust Clean thoroughly the dust
Printed circuit board Whether there is dust Clean thoroughly the dust
Cooling fans Whether there is abnormal
vibration or abnormal noise
Replace cooling fans
Power element Whether there is dust Clean thoroughly the dust
Electrolytic capacitor Whether there is discoloring,
peculiar smell
Replace electrolytic
capacitor
8.2.2 Thermally maintaining
In order to let inverter work well for a long term, user must maintain the inverter thermally.
The replace time of element of inverter is shown in Table 8-2.
Table 8-2 frequency inverter parts replacement
Items Time criterion
Cooling fans 2-3 years
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