User Manual of EM730 Series Inverter Table 4- 27 Content of Regular Inspection In order to make the inverter work properly in a long time, regular maintenance and replacement must be performed regularly based on the service life of its internal components. The service life of the components of the inverter varies depending on the operating environment and conditions. The replacement period of the inverter in Table 4-28 is for reference only. Table 4- 28 Replacement Intervals of Inverter Components The operating conditions for replacement of the inverter components listed in the above table are as follows: Ambient temperature: Annual average 30 ℃ . Load factor: Less than 80%. Operating time:
less than 12 hours per day. 362 Check Item Check Content Solution Screws of main circuit terminals and control circuit terminals Check whether the screws are loose. Tighten the screws with a screwdriver. Cooling fins Check whether there is dust or foreign objects. Purge them with dry compressed air (pressure: 4-6 kg/cm2). PCB (printed circuit board) Cooling fan Check it for abnormal noise and vibration. Check whether the cumulative running time is up to 20,000 hours. Replace the cooling fan Power components Check whether there is dust. Purge them with dry compressed air (pressure: 4-6 kg/cm2). Electrolytic capacitor Check it for color changes, odor and bubbles.
Replace the electrolytic capacitor. Name of Part Standard Replacement Interval (Year) Cooling fan 2-3 years Electrolytic capacitor 4-5 years Printed circuit board 5-8 years