User Guide of EM730 Series Inverter Chapter 7 Maintenance 7.1 Daily Maintenance of Inverter Depending on the usage, the user needs to check the inverter on a regular basis to eliminate faults and safety hazards. Prior to the inspection, turn off the power supply and wait until the LED indicator of the keyboard is OFF, and then wait for 10min. The check content is shown in Table7-1 Table 7-1 Content of Regular Inspection replacement must be performed regularly based on the service life of its internal components. In order to make the inverter work properly in a long time, regular maintenance and Table 7-2 Replacement Intervals of Inverter Components table are as follows:
The operating conditions for replacement of the inverter components listed in the above Ambient temperature: Annual average 30 ℃ . 55 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