User Manual EM303B General Purpose Inverter 11 Maintenance and Inspection 11.1 Maintenance and Inspection Due to the service environmental changes such as temperature, humidity, smoke, frost, dust, or the factors as aging of inverter’s internal components, various failures of inverter may occur. Therefore, it is required to have daily check and keep regular maintenance on inverter during use and storage. Check if the components are broken or the screws are loose during transportation. Clean the inverter and periodically check if the screws are loose. Power-on the sleeping inverters for 30 minutes once semiannually to prevent electronic components from being disabled.
Keep inverter away from heavy humidity and metal particles. If necessary, put it in an electric cabinet or a small room with protective measures. 11.2 Daily Inspection Check the following items with the inverter in operation: The motor should not be vibrating or making unusual sound. Inverter and motor should not be overheating. The ambient temperature should not be too high. The output current value shown on the monitoring displays should not be higher than normal value. The cooling fan at the bottom of the inverter should be in normal operation. 11.3 Periodic Maintenance Periodic maintenance ensures that the inverter receives the proper care to maintain overall performance.
Always turn the power supply off before inspection, and the inspection starts only after the indicator CHARGE on main circuit power supply is off. Table 10-1 Periodic Maintenances 170 Item Checks Corrective Action Main circuit terminals, screws on control circuit terminals Are all screws tight? Tighten loose screws firmly. Heat Sink Are there dirty or dusty? Clean any dirt and dust off with an air gun using dry air at a pressure of 4～6kg/cm2 PCBA Cooling fan Is there any unusual noise or vibration or has the total operating time exceeded 20,000 hours? Replace the cooling fan. Power Components Are they dusty?
Clean any dirt and dust off with an air gun using dry air at a pressure of 4～6kg/cm2 Electrolytic Capacitor Are there any irregularities such as discoloration or odor? Replace the capacitor.