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. 6-5 Inspection part Inspection item Inspection point Inspection period Inspection method Criteria Standard replacement period Meter Daily Periodic Control circuit Operation check Check the balance of output voltage levels between phases in Inverter run. Check that there are no errors in trip detection and the display circuit throughout the operation of sequence protection.
3 3 Measure the phase- to-phase voltage between Inverter output terminals U/ T1, V/T2, and W/T3. Simulate the Inverter trip circuit output Ex) Use an external trip etc. Voltage difference between phases 2% max. Operates with no faults Digital multimeter Rectifier Voltmeter Parts check (including PCB) General Check that there are no abnormal odors or discoloration. Check that there is no significant rusting. 3 3 Visual inspection No faults Capacitor Check that there is no liquid leakage or deformation. 3 Visual inspection *1 Display Digital Operator Check that the display is clear. Check that there are no missing parts. Check that the LED indicators are lit properly.
3 3 3 Visual inspection Normal operation Display can be read