User Manual of EM760 High-Performance Inverter Maintenance 8.3 Daily Maintenance of Inverter The inverter maybe subject to various faults due to changes in its operating environment, such as the impact of temperature, humidity, smoke, dust and the like, and ageing of internal components. Thus, daily inspection and regular maintenance should be carried out to the inverter during storage and operation. ● Check whether the components of the inverter are intact and whether the screws are tightened after transportation and before operation. ● During the normal operation ofthe inverter, clean dust on a regular basis and check whether the screws are tightened.
● If the inverter is not in use for a long time, it is recommended to power it on (preferably 30 min) once every six months during storage, to prevent the failure of electronic components. ● The inverter should not be used in the humid place or place with metal dust. If necessary, use the inverter in an electrical cabinet with protective measures or an on-site protective cabin. Please check the following items during the normal operation of the inverter: ● Check the motor for abnormal sound and vibration. ● Check the inverter and motor for abnormal heating. ● Check whether the ambient temperature is too high. ● Check whether the output current is normal.
● Check whether the cooling fan of the inverter works properly. 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, turnoffthe power supply and wait until the LED indicator of the keyboard is OFF, and then wait for 10min. The check content is shown in the table below. Table 8-2 Content of regular inspection In order to make the inverter work properly in along 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 the table below is for reference only. 226 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.