4-2 Daily Inspection and Periodic Inspection 4-2 Daily Inspection and Periodic Inspection 4 Inspection and Maintenance 4-2 Inspec- tion part Inspec- tion item Inspection point Inspection period Inspection method Criteria Meter Daily 1 year General Ambient environ- ment Check ambient temperature, as well as humidity and dust levels. { Refer to "Installa- tion"(Page 12). Ambient temperature −10 °C to 50 °C, no freezing Ambient humidity 90 % max., no condensa- tion. Thermom- eter, Hygrome- ter, Recorder Entire device Check that there are no abnormal vibrations or sounds.
{ Visual or acoustic inspection No faults Main circuit General Megger test (between main circuit terminal and ground terminal) { Disconnect the wir- ings of the main and the control cir- cuit terminals, use a megger to mea- sure the resistance between the ground terminal and the short-cir- cuited parts of main circuit terminals P, RB, and N. 5 M Ω min. Refer to "4-3 Megger Test". 500 V DC megger Check that any parts which may need tightening are secure. { Tighten securely. No faults Check that no part has indica- tions of overheat- ing. { Visual inspection Connec- tion con- ductor and wire Check that there is no distortion with the conduc- tor.
{ Visual inspection No faults Check that there is no tearing in the wire coverings. { Terminal block Check that there is no damage. { Visual inspection No faults