6-1 Inspection and Maintenance 6 Inspection and Maintenance *1. The life of the smoothing capacitor depends on ambient temperatures. Refer to "Appendix-2 Product Life Curve" for the replacement reference. *2. The life of the cooling fan varies depending on the environmental conditions, such as ambient temperature and/or dust. Check the operation through daily inspections. *3. The replacement reference (year/cycle) or " Appendix-2 Product Life Curve " is based on the expected design life, which is not guaranteed.
6-5 Inspection part Inspection item Inspection point Inspection period Inspection method Criteria Meter Daily Periodic 1 year 2 years Control circuit Protection circuit Operation check Check the balance of output voltage levels between phases in single Inverter run. { Measure the voltage between Inverter main circuit terminals U/T1, V/T2, and W/T3. Phase-to-phase voltage balance 200-V class: 4 V max. 400-V class: 8 V max. Digital multimeter Rectifier Voltmeter Check that there are no errors in protection and display circuits through sequence protection operation. { Short-circuit or open the Inverter protection circuit output under simulated conditions. Error is found in the sequence.
Cooling system Cooling fan Check that there are no abnormal vibrations or sounds. { Rotate manually when the power is off. Rotates smoothly. No faults Reference of the replacement period: 10 years *2 *3 Check that the connection parts are secure. { Visual inspection Fin Check that there is no clogging. { Visual inspection No clogging. Display Display Check that the LED indicators are lit properly. { Visual inspection Check that the LED indicators are lit properly. Cleaning { Clean with a waste cloth. Meter Check that the indicated value is normal. { Check the indicated values on the panel meters. The specified or control values must be satisfied. Voltmeter, ammeter