6-1 Inspection and Maintenance 6 Inspection and Maintenance *1. The life of the capacitor depends on ambient temperatures. Refer to "Product Life Curve" (App-17). *2. Clean the Inverter periodically. Accumulated dust in or on the cooling fan or heat sink can cause the Inverter to overheat. 6-4 Inspection part Inspection item Inspection point Inspection period Inspection method Criteria Standard replacement period Meter Daily Periodic Main circuit General Insulation resistance test (between main circuit terminal and ground terminal) Check that the screws are secure. Check that no part has indications of overheating.
3 3 3 Megger check (Refer to 6-2.) Tighten securely Visual inspection 5 MΩ min. Tightening torque (excluding terminal block) •M 3.5: 0.8 N•m •M 4 : 1.2 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 Relay terminal block Check that there is no abnormal sound during operation. 3 Acoustic inspection No faults Resistor Check that there are no large fissures or discoloration in the resistance insulation.
3 Visual inspection No faults Tester Cooling fan Check that there are no abnormal vibrations or sounds. Check that there is no dirt or dust.*2 Check that the fan is mounted correctly. 3 3 3 Rotate manually when the power is off. Visual inspection Visual inspection Smooth rotation 2 to 3 years