6-1 Inspection and Maintenance „ Daily Inspection and Periodic Inspection 6 Inspection and Maintenance *1. The life of the capacitor depends on ambient temperatures. Refer to the product life curve in Appendix-2. When the capacitor stops operating at the end of the product's life, the Inverter must be replaced. *2. Clean the Inverter periodically. Accumulated dust in or on the cooling fan or heat sink can cause the Inverter to overheat.
6-3 Inspection part Inspection item Inspection point Inspection period Inspection method Criteria Standard replacement period Meter Daily Periodic General Ambient environment Check ambient temperature, as well as checking for humidity, dust, hazardous gases, oil mist, etc. 3 Monitoring, visual inspection Ambient temperature -10°C to +40°C With no freezing Ambient humidity 20% to 90% With no condensation Thermometer Hygrometer Entire device Check that there are no abnormal vibrations or sounds. 3 Visual or acoustic inspection ⎯ Power supply voltage Check that the main circuit voltage is normal. 3 Voltage measureme nt between terminals R/ L1, S/L2 and T/L3 on the Inverter terminal block.
The following conditions must be satisfied: (200-V class) 200 to 240 V 50/60 Hz (400-V class) 380 to 480 V 50/60 Hz Tester Main circuit General Insulation resistance test (between main circuit terminal and ground terminal) Check that the screws are not loose. Check that no part has indications of overheating. 3 3 3 Megger check (Refer to 6- 2.) Tighten securely Visual inspection 5 M Ω min. Tightening torque (excluding terminal block) • M 3.5: 0.8 N•m • M 4 : 1.2 N•m • M 5 : 3.0 N•m ⎯ 500 V DC megger Terminal block Check that there is no damage. 3 Visual inspection No faults Smoothing capacitor Check that there is no liquid leakage. Check that the safety valve has not come out.
Check that there are no bulges. 3 3 3 Visual inspection No faults *1