@droftarts
I had never heard of such surges occurring at installation sites, so it was unexpected.
I plan to replace all the tool boards I use.
I think the firmware version of the 1LC was 3.4.4.
1LC should not have had 3.4.5.
sorry. I can't confirm it right away because I don't have the equipment at hand.
I think additional surge protection should be added to the AC circuit.
Is a protective component like a varistor necessary on the DC side as well?